Critical Thinking And True Friendship Essay Example | Topics and Well Written Essays - 500 words

Critical Thinking And True Friendship - Essay Example Loyalty and guarding each other’s secrets is of high importance and when this loyalty is broken, a lifetime friendship can be broken. Last holiday, I visited my best friend at their house where I was to stay for a whole week. Prior to the visit, I had noted that my friend was behaving weirdly. He was missing classes and had started hanging out with the wrong group of people. He had begun failing his classes and had a bulk of work that needed to be done but was not even taking time to do. When I asked him, what is going on he gave me evasive answers. I did not disclose my observations to anyone and I remained silent. A mutual friend had told me that he had seen him abusing drugs and this was just too much for me to believe. Confused and not knowing what to do, I knew that he needed me now more than ever and I had to help him. The visit came at the right moment and I knew I was going to use this opportunity to find out was really going on. In one of the drawers in his closet, I found a pack of cigarettes and alcohol. I did not approach him immediately and all day I took time to critically think about what approach I was going to use to get him to open up to me. He likes movies and this was going to be my approach. I went to the movie store and bought a movie of a teenager who was abusing drugs and who later reformed after going for counseling and healing. This was in relation to his problem of lowliness caused by the divorce of his parents and his upbringing in a foster home. After watching the movie, he became emotional and that is when I approached him and he finally opened up to me. His parents were getting divorced and he was feeling very depressed and did not know how to best deal with it.

The U.S cultures and business perspectives Essay

The U.S cultures and business perspectives - Essay Example Just like the U.S.A, Brazil is a melting pot of nationalities due to long periods of slavery and European domination. The country has about 190 million people, whereby 50% of the people are white. Majority of the Brazilian people are Catholics and speak Portuguese as a national language. Bananas are the staple food in Brazil. Bananas are also grown in America, Texas. The Brazilians prefer to deal with companies, rather than individuals when doing business. The people have a close adherence to business etiquette like the Americans. The Saudi Arabians are primarily Arabs and Muslims. Greetings are very formal in Saudi Arabia. On the other hand, people in the U.S don’t take too much time greeting each other. Women in Saudi Arabia dress in abayas (cloths that cover the entire body except the face and hands). The manner of doing business in Saudi Arabia is largely similar to that of the U.S.A in terms of etiquette and communication style. The country is the Middle East’s lar gest trading partner of the U.K. Dressing in suits and ties is a similarity for Saudi and American businessmen.  Territorial-wise, Russia is the largest country in the world. With Russian serving as the main language, the country has over 190 ethnic groups. Christianity, Islam and Tengrism are the primary religions of Russia. The Russians eat unique foods such as Borshch, Caviar and Pirozhkis. The Russians value time keeping highly when doing business. The ceremonial practice of receiving and exchanging business cards is taken seriously in Russia.

Joint Illnesses and Diseases: Causes and Treatments

Joint Illnesses and Diseases: Causes and Treatments Herniated Disc Herniated (slipped) disc happens when all or only a portion of an intervertebral disc is forced through the weak part of the disc thus exerting pressure to the adjacent nerves or spinal cord. Intrinsic degeneration of the intervertebral disc or extrinsic compression of the neural structures in the spinal canal can cause radicular pain. The loss of disc height, which can alter the mechanics of the axial skeleton, may result to disc degeneration. The said changes might produce in other structures such as the zygapophyseal (facet) joints and may result to spinal stenosis. Radicular pain is defined as pain radiating in the distribution of spinal nerve caused by the irritation of the dorsal root ganglion while discogenic pain is an axial pain originating in a degenerative disc. [39] [40] [41] [45] Considered to be a critical part of the load-bearing structures of the spinal column, the structural component of the invertebral disc make it capable of changing shape and absorbing shock thus allowing movement. The dysfunction of the intervertebral disc is brought about by multiple factors namely trauma, aging or the degenerative disorders of the spine. [46] The boundary between nucleus and annulus become less evident as a person ages, furthermore as a person grow older the nucleus of the intervertebral disc becomes less gel-like and more fibrotic. Trauma results from activities such as slipping, lifiting while in a flexed position, suppressing a sneeze or falling on the buttocks. Degeneration like in osteoarthritis or ankylosing spondylitis predisposes the misalignment of the vertebral column of the client. [46] A research on the mechanism of intervertebral disc pointed out several pathophysiologic processes. It includes the changes that occur in aging, loss of proteoglycan which is mentioned as the most significant biochemical change that occurs in disc degeneration. It is inferred that the loss of proteoglycan leads to loss of hydration. Another mechanism is the loss of collagen fiber. Unlike with the proteoglycan, the loss of collagen is not that evident. Furthermore, it is deduced that the biochemistry of disc degeneration do not just include increase fragmentation of collagen and proteoglycans but also it includes the increase fragmentation of fibronectin populations. The said mechanisms contribute to the functional changes of the intervertebral disc. [6] The cervical and lumbar portion of the vertebrae is commonly affected by the dysfunction because it is the most flexible areas of the spine where bending of the vertebral column and support of the mass are greatest. Around 90 to 95% of herniations in the lumbar vertebrae occur in L5 or L% to S1 regions respectively. With regards to the herniation at the cervical spine, the most often affected portion is C1 to C7 and C6 to C6. The protrusion usually happens posteriorly toward the intervertebral foramen where the annulus fibrosus is thin and poorly supported by the anterior or posterior ligaments. Pain is the first and the most usual symptom of herniated disc. The nerve roots namely L4, L5, S1, S2 and S3 give rise to back pain that radiates down back of the leg and over the sole of the foot. Major weakness is rare but slight weakness may occur. Also the most common sensory deficits are paresthesia and numbness, specifically of the leg and foot. There are instances also that knee and ankle reflex may also be absent or decreased. [46] Osteoarthritis Osteoarthritis is a disease in the joints that usually affects middle-age to elderly people. The disease is commonly referred as OA or as the wear and tear of the joints although it also involves the cartilage, joint lining, ligaments, and bone. Osteoarthritis is undoubtedly the most usual type of arthritis. [47] Almost 27 million Americans are living with osteoarthritis and almost 1 million people consults medical professional because osteoarthritis. [47] Perhaps, it is the most cause of disability and pain among elderly people. [48] [49] Among the risk factor in the development of osteoarthritis are old age and obesity, in fact in the United States it is concluded that by the year 2020, the prevalence of osteoarthritis is already 66 to 100%. [49] Epidemiologic data shows that age, gender and race interact in the development of osteoarthritis. Men is said to be affected at a younger age compare to women however the prevalence of women affected with osteoarthritis exceeded men by mi ddle age. [50] Heredity influences the occurrence of osteoarthritis. There is a lower prevalence of hip osteoarthritis among Chinese than Europeans, perhaps representing the influence of other factors such as occupation, obesity or heredity. White women will most likely experience hand osteoarthritis on the other hand knee osteoarthritis is more common on black women. [49] In addition, excess fat may have might have a direct metabolic effect on cartilage beyond the effects of excess joint stress; hence weight loss reduces the risk of developing knee arthritis. The disease is defined as a breakdown of joint cartilage brought about by mechanical strees or biochemical alteration, resulting to the failure of the bone underneath. Osteoarthritis used to affect various joints in the body which includes hip, knee, first metatarsal pharyngeal joint and, cervical and lumbosacral spine. [47] [48] With regard to hands, the base of the thumb and, the proximal and distal interphalangeal joints are most commonly affected. Osteoarthritis is a joint failure wherein all structures of the joint have undergone structural change which is pathological. [49] As mentioned earlier, osteoarthritis is popularly known as wear-and-tear arhthritis. Osteoarthritis undergoes substantial mechanical and composition change in the properties of cartilage. [48] The first structural change happens in the cartilage followed by the soft tissue. The progressive wear and tear of the cartage leads into thinning of the surface of the joint and bone ulceration. Later on, inflammation of the joint, increased in the blood flow and hypertrophy of subchondral bone will occur. Consequently, new cartilage and bone will be formed at joint margins resulting to osteophytosis or bone spurs which cause alteration in the shape and size of the bone. The primary manifestation of osteoarthritis is a long-standing pain in one or more joints that aggravate with weight bearing or joint use. There is also a presence of morning stiffness usually for 30 minutes and bone deformity (osteophyte) or enlargement of the joint. In some cases there are crepitation and effusion. [51] Spondylolisthesis Spondylolisthesis is a bone condition wherein a vertebral body in the spine slips out of the proper position onto the bone below it. It can be associated with spondylosis, infection, lumbosacral junction congenital anomalies, osteoporosis, trauma, tumor, degenerative spine or prior surgery. It is most common to women than men. The slippage of the vertebral body may be asymptomatic or may cause low back pain, hamstring tightness, nerve root injury which is more frequent in L5, or spinal stenosis. The tenderness of spondylolisthesis can be produced near the segment that has slipped forward. There might be a protrusion of the abdomen and shortened trunk because of the extreme forward displacement of L4 on L5. Surgery is usually recommended for patients who are not recovering through rest and physical therapy. [33] In children spondylolisthesis usually happens between the L5 and S1. It is sometimes because of a birth defect in the spine area or an acute injury in the portion of the spine. In adults, the most often reason behind the development of spondylolisthesis is the abnormal wearing off of the bones and cartilage such as in arthritis. Individuals playing sports such as gymnastics, football and weight lifting is at risk in developing the disease. [52] Anteroposterior and lateral plain radiographs of the lumbar spine should be obtained in patients complaining of back pain. The lateral view of plain radiograph is useful in identifying spondylolithesis for it can demonstrate the pars interarticularis. Pars interarticularis is the region of junction of the lamina and the pedicle. Incases wherein there is an absence of nerve involvement, computed tomography (CT) scanning of the lumbar spine provides necessary information with regards to spondylolithesis and its possible cause. CT myelography can give information regarding nerve impingement to patients with radiculopathy. Magnetic Resonance Imaging is advantageous for it protects the patient from being exposed to radiation while imaging is being done. Typically sagittal and axial planes are used. [52] Fibromyalgia Fibromyalgia is a poorly understood type of myofascial pain syndrome. Patients with fibromyalgia usually have severe muscle pain and tenderness having specific trigger points, easy fatigability and disturbances in sleep. People with fibromyalgia have â€Å"tender points† such as on neck, shoulders, hips, arms, legs and back. These areas hurt if pressure is exerted to them. In the United States, fibromyalgia has a prevalence rate of 3 to 5 % in females and 0.5 to 1.6% in males. Fibromyalgia is the second most common disease that experts in rheumatology encounter with 15% among those who are evaluated. It is also ascertained that around 8% of patients cared in primary care clinics have fibromyalgia. In 2005, the United State spend 10, 199 dollars per patient per year and it has been also estimated that overall, fibromyalgia costs the United State economy over 9 billion dollars every year. [53] With respect to gender, epidemiologic data reveals that fibromyalgia is more common to women than in men with a female-to-male ratio of around 9:1. Furthermore, it can occur to patients at any age of either sex. It can occur to pediatric patients, especially the adolescents. [54] The current understanding about fibromyalgia is that it is a disorder of central pain processing or a syndrome of central sensitivity. It is described as a problem with pain threshold. Researchers suggests that patients with fibromyalgia have a lower threshold to pain and other stimuli namely noise, heat and strong odor. It is also believed that neurobiologic changes causes hypersensitivity of patients. These neurobiologic changes are related to psychological factors in that this change affects the person’s perception to pain, expectancy or vigilance. Disturbed sleep has been linked to the pathogenesis of fibromyalgia. Studies have ascertained that awakening unfreshed or nonrestorative sleep has been observed in most of the patients with fibromyalgia. Sleep electroencephalographic studies have shown disruption of normal stage 4 of sleep (non-rapid eye movement). Deprivation in stage 4 sleep has a role in causing fibromyalgia as supported by the observation that symptoms of fibromyalgia developed to normal individuals with disrupted sleep in stage 4. Decreased serotonin metabolites are seen in the cerebrospinal fluid of patients with fibromyalgia. Since serotonin is known to be a neurotransmitter that regulates NREM sleep and pain, it is believed that it might also be involved in the pathogenesis of fibromyalgia. Autonomic dysfunction is also suspected to be involved in the development of fibromyalgia. Individuals with the said disorder were observed to have low levels of cortisol. Low level of urinary free cortisol decreased respo nse to corticotrophin-releasing hormone suggest abnormal hypothalamic-pituitary-adrenal axis. There is also low level of growth hormones. Growth hormone is released during stage 4 or NREM sleep. Many patients have accompanying psychological abnormalities. Almost 30% of patients fit the diagnostic criteria of anxiety, depression, somatization and hypochodriasis. There is also high prevalence of physical and sexual abuse, and eating disorder. [55] The goal of treatment for patient with fibromyalgia is to relieve pain and other symptoms, and to help a person cope with the said symptoms. It includes: physical therapy, stress relief methods, exercise and fitness program, antidepressants, muscle relaxants and cognitive behavioral therapy. The Haunting Of Hill House | Analysis The Haunting Of Hill House | Analysis Eleanor life is characterized by numerous challenges that happen because of her mother. She has a difficult responsibility of taking care of her ailing mother without any help from the society. She leads a strange life blending with people that sees her outcast in the society as she has grown with the attitude that people hate them because they do not mix with them. She later learns that her mother defied the society norms, and that is the reason that the society abandoned her. Others believe that perhaps that is the reason that she is ailing. Even though, Eleanor is aware of the existence of the social norms, she never knew their significance because she was never into them. After she drives into the Hill House, at first, she is not certain about her identity in the society, and she thinks that in the Hill house, she might experience some difference. She enters the house and her life changes, she starts seeing things in a completely different way and after contemplating on her relationship with the society, and she has no option, but to become a witch. Her death is mysterious as other character restores their lives back. It is true that many critics and readers believe that, in the end, Hill House consumes Eleanor and she willingly allows this to happen. Hill House consumes Eleanor Eleanor mothers poor health deprived Eleanor more than just her precious moment. The main reason that Eleanor rides forth to the house is an event that happened when she was young that certainly integrated some kind of supernatural manifestations. Despite of the situation, Eleanor tells Dr. Montague afterward in the story that she cannot clearly recall her mother claimed that the neighbors never appreciated them, and that was the reason that she would never mix with them (Jackson 73). The reader learns that, Eleanor and her sister had supposed at the time that the other was responsible for the supernatural incident (Jackson 7). This incident although, Dr. Montague reassures Eleanor that the event is long forgotten, means the incident must have had a negative impact on Eleanors family and, certainly did not affect Eleanors personality (Jackson 74). She is still uncertain whether she will ever be accepted in the society after her mother defying the social norms. It is difficult to face the reality in order to fight the stigma from the society. However, that is the only way out if she has to survive in the society. From the start, Eleanor grew up with a mother who was against the societys norms. Perhaps the ailing mother suffered out of her ignorance to the societal norms, and Eleanor suffers because of her mother. The journey to the Hill House is move that Eleanor fails tom resist. At one point, he thinks it is the right call for her to make, considering her relationship with the society and at another point, he wrestles with that spirit that pushes her to accept the invitation into the house. It becomes almost impossible for her to make a decision. From the onset of the book, Eleanor is in a dilemma. Even though, there are some characters in the Hill House that accepts to be part of the Hill house that does not mean that Eleanor should be inclusive. As opposed to Eleanor, the four characters have weird characters and perhaps that is the reason they feel comfortable being part of the Hill House. For instance Luke, despite being an heir of the house, steals from his aunt. Theodora too, an artist by profession is a lesbian. Doctor Montague, although a scholar, has an interest in the occult. This shows that, even though it is difficult to accept these characters within the social culture, they are better off than Eleanor, who cannot face the society. To worsen the matter, Eleanor is homeless, and this secludes her from the rests of Jacksons characters. Theodora engages into a conflict in the Hill House, but she cannot return, she remains there. The house has already consumed her. In depicting a homestead setting far from the Hill House, Jackson reveals to the reader that Dr. Montague is a family man and in the later chapters, we see his wife cleaning dishes together with Mrs. Dudley in Hill House, and this shows a kind of familiarity. Similarly, Dudley and her family own a house in town (Jackson 39) which keeps them safe from the house during late night hours. Moreover, Luke Sanderson could say that he owned the house, but he never took care of it. Luke is an affluent man, and he could buy the house, but it is not clear why he does not have one. Instead of accepting her situation and predicaments in life, for instance, being homeless, Eleanor says that she has a home. She is aware of the social values, even though she has never been deep into them. Hill house is a strange house as depicted in the previous discussions. When Eleanor accepts to be consumed by the house, she turns out to be an outsider. The House consumes Eleanor, and it blends both her fear and attraction of the House. She is lured into mysterious place, and she becomes interstitial that her pas life when she enters the house. Eleanor fits neither with her friends, nor in the society, and she turns out to be outrageous. The society rejects her , she turns to be a fringe member, and she does not have an option, but to fit into the skin of a witch. The five characters in the house have their differences, but Eleanor believes that with time they will adopt tom each others behavior (Jackson 58). She anticipates that sooner they will be a friend, and Theodora, affectionately refers to her as a cousin. They lived in the house as one family and even shared meals together. However, some scholars look at this situation in a different perspective, for instance, Tricia Lootens, in Whose Hand I Was holding, says that the characters live together as one family. However, Lootens is not certain about the continuity of this group and she cites this as terror of [Jacksons] entire culture: the brutal, inexorable visionà ¢Ã¢â€š ¬Ã‚ ¦of nuclear families that kill what they are supposed to nurture (151). Even though, Lootens believes that the group has a hidden agenda of ruining each others life, I refute with her perception. The characters are in harmony with one another, and there is no sense or fear between them. Eleanor is the one who is undisputed and seems rejected and deserted. This is evidenced at the novel closes its chapters, whereby Theo, Luke, and Dr. Montague observe Eleanor and she distances herself from the Hill House. Jackson mentions about the death of Eleanor and the other characters going back to their normal lives. Novel Dental Materials for Root-end Applications: A Review Novel Dental Materials for Root-end Applications: A Review Abstract Achieving a good apical seal is crucial for ensuring successful endodontics; especially in cases that involve a wide apex (e.g. immature apices, apical resorption, and fracture involving the tooth apex). An efficient root-end material is an absolute requisite towards achieving this goal. The recent years have witnessed a decent outflow of new products for root-end applications. However, their merits, and claims of superiority over MTA, have to be ascertained via sustained research. Keywords: Apical seal, bioactive, MTA, novel root-end materials, review. Introduction The quest for an ideal material for root-end applications has produced a plethora of products that are based on different compositions and exhibit varied setting reactions. Though many of them have been proven to be effective, none of them can be described as ideal yet, thus generating scope for further development. MTA as the gold standard Since its introduction by Torabinejad in 1993, MTA has been extensively studied and used. Over the years, it has emerged as the time-tested and attested material. MTA is essentially Portland cement (Sio2, CaO, Al2O3, MgO, and Fe2O3), to which a radioopacifier (Bi2O3), and dehydrated(anhydrous) calcium sulphate have been added. MTA is biocompatible and osteogenic. It is bioactive: i.e. MTA is capable of interacting with living tissues and allows deposition of apatite crystals in the MTA-tissue interface. This material is capable of inducting hard tissue formation.1 Apart from exhibiting excellent sealing properties, it also has the capacity to set and also remain steady in the presence of moisture. Hence, a recent review has described it as ‘hydraulic silicate cement’.2 However, this material is not devoid of disadvantages. Re-entering MTA-treated teeth is difficult. High acidity and alkalinity (beyond a pH of 8.4) can unfavorably influence the surface hardness of set MTA. MTA is shown to expand uncontrollably.3 Grey MTA has been found to discolor tooth and the neighboring gingival tissues. Both grey and white MTA contain toxic substances and impurities. The material is fairly difficult to manipulate owing to its sandy consistency; though the small particle size of white MTA may aid in producing a thicker mix; hence, better workability.4 MTA exhibits low washout resistance during initial set especially when a setting accelerator is not incorporated into the MTA mixture. Its initial solubility is undesirable when used as a root-end filling material.5 In lieu of MTA’s potential drawbacks, the search for superior materials has resulted in the emergence of newer materials in the market; the majority of which, bear resemblance to MTA with minor alterations in their composition. Bioaggregate This novel water-based, hydraulic cement, consists of tricalcium silicate as its primary component. Tantalum oxide imparts radioopacity; hydroxyapatite and amorphous silicon oxide have been added to reduce the level of formation of the weak phase- calcium hydroxide.6 Purity is ensured via elimination of aluminum. Though the manufacturer states that trace amounts of naturally occurring contaminants may be detected during chemical analysis, the lack of detection of heavy metal contamination is noteworthy. The material is bioactive.7 Sayeed et al. suggested that Bioaggregate be considered as an alternative to MTA owing to the former’s better sealing ability. The authors attributed the hermetic seal associated with bioaggregate to: (1) Its nano-sized particles that exhibit excellent adhesion to the dentinal walls of the root canal, (2) Its hydrophilicity.The presence of a gel-like calcium silicate hydrate as the main component, resulted in improved strength, hardness, and sealing characteristics to the set material.8 Bioaggregate also exhibited excellent biocompatibility and induced periodontal regeneration.9 Biodentin Biodentine, marketed by Septodont is available as a powder and liquid formulation. Tricalcium silicate and dicalcium silicate form the core materials of the powder. Purity of calcium silicate is enhanced by eliminating the contaminants namely aluminates. Calcium carbonate and calcium oxide, and zirconium oxide have been added as the fillers and as the radioofacifier respectively. Liquid comprises of calcium chloride as the accelerator. Hydrosoluble polymer and water reducing agents are also present. Biodentine can be used as a root repair material but is not indicated for root amputation and hemisection. The working time is over 1 minute and the setting time ranges between 9 and 12 minutes. The final hardness of Biodentine approximates that of the dentin, thus rendering retreatment difficult if not impossible. 10 On performing cytotoxicity assay and cell growth on set materials, human gingival fibroblasts responded similarly to Biodentine and MTA extracts.11 EndoSequence Root Repair Material EndoSequence Root Repair Material (Brasseler USA) is based on bioceramic technology and is essentially composed of nanoparticles of tricalcium silicate, dicalcium silicate, calcium phosphate monobasic, amorphous silicon dioxide, and tantalum pentoxide.12 It differs from white MTA mainly in that it is aluminium free and contains calcium phosphate monobasic and tantalum pentoxide (radioopacifier).13 It is marketed as a pre-mixed formulation in two different consistencies: syringeable paste, and condensable putty. `The former has bendable tips to facilitate intra-canal material placement. 14 According to the manufacturer, the material exhibits superior handling properties owing to its pre-mixed formulations, short setting time (~2 hours), and high resistance to washout. The material is radiopaque, hydrophilic, and highly alkaline (+12 pH), thus bactericidal. Its setting reaction is initiated by dentinal moisture. 15 Endo sequence is bioactive. 16 Hirschberg et al. compared the sealing a bility of ERRM with MTA, and concluded that leakage was greater in samples restored with ERRM when compared to that of MTA-restored samples.17 In simulated root resorption defects, intracanal placement of white MTA resulted in greater and sustained release of hydroxyl ions, and thus a higher pH when compared to EndoSequence. This, the authors attributed to the quicker set of ES as compared with MTA. But, few MTA samples exhibited discoloration, while none of the ES samples did. This may be esthetically relevant.18 Top of Form Bottom of Form iRoot BP Plus These bioceramic materials are primarily composed of calcium silicate, and require the presence of moisture to set and harden. They also contain zirconium oxide, tantalum pentoxide, calcium phosphate monobasic, and filler agents They are available in three forms: (1) iRoot ® BP Plus putty root canal filling andrepair material- white hydraulic premixed puttyintended to be used for root canal repair and restorative applications, (2) iRoot ® BP Injectable Root Canal RepairFilling Material- white hydraulic premixed injectable paste intended to be used for root canal repair and restorative applications, and (3) iRoot ® SP Injectable Root Canal Sealer- injectable white hydraulic cement paste intended to be used for permanentroot canal filling and sealing applications. 19 According to the manufacturer, these materials are insoluble, radiopaque, aluminum-free, possess excellent physical properties, and do not contract on setting.20 iRoot ®BP Plus was biocompatible and did not elicit critical cytotoxic effect. However, its long-term performance was inferior as compared to White MTA.21 Another study observed that both materials i.e. iRoot BP Plus and iRoot FS exhibited negligible cytotoxicity. Under simulated clinical conditions, iRoot FS was able to completely solidify within an hour, whereas iRoot BP Plus set only after seven days.22 Ceramicrete Developed at Argonne National laboratory, Ceramicrete is essentially a chemically bonded phosphate ceramic (CBPC), which was developed to function as a binder for waste management. The material was inducted into dentistry owing to its inherent strength, biocompatibility, and bioactivity. Radioopacity is achieved by incorporation of radio opacifiers (bismuth oxide, cerium oxide). Wagh and Primus found Ceramicrete to be a strong material exhibiting lower porosity and permeability due to the formation of potassium-magnesium phosphate hexahydrate ceramic matrix phase. The decreased porosity also contributes to Ceramicrete’s superior sealing capacity.23 The use of an acid conditioner prior to application of ceramicrete may result in better adaption due to removal of smear layer, thus improving the seal. Incorporation of calcium silicate whiskers resulted in the formation of a brushite phase, which improves mechanical properties. Though, initially, the material tends to be acidic, set Ceremicrete-D is alkaline (pH of 11 after 72 hours). However, the acidic pH (2.2) of a fresh mix may exacerbate the acidic condition of an already inflamed tissue. 24 The low pH may be the reason why ceramicrete D caused initial death of primary osteoblasts and failed to support further cell growth, since low pH is shown to inhibit osteoblast activity. 25 The radioopacity of ceremicrete was substantially less (3.2mm of aluminium) than white MTA (8.5mm of aluminium). Handling properties and resistance to washout were superior. According to porter et al, Ceremicrete-D retained a weak chalk like consistency even after seven days of setting. They suggested the original formula be modified to effect increase in the strength of the material.26 Capasio Capasio (Primus Consulting, Bradenton, FL) is an experimental calcium-phospho-aluminosilicate–based cement that is mixed with a water based gel. Bismuth oxide has been added as a radiopacifier.27 When mixed, Capasio develops dough like consistency and can be rolled into a rope which enables better handling. Ceremicrete-D and Generex A also demonstrate this desirable property. Capasio displays good washout resistance, and improved physical characteristics such as setting time (9 minutes), compressive strength, and washout resistance.26 It exhibited slightly less basic pH (10.9) when compared with white MTA. 28 The radiopacity of Capasio was significantly less as compared to MTA but marginally greater than Ceremicrete-D.26 Capasio is also bioactive. It has the ability to precipitate apatite crystals on its surface. The smaller particle size of Capasio (a mean particle size of 5.3 µm as compared to 10 µm of MTA) may be perceived as an advantage. Materials that demonstrate the capability of penetrating dentinal tubules exhibit improved marginal adaptation, retention, and also entomb the residual bacteria. The material was shown to penetrate dentinal tubules up to a depth of 18-26  µm; much greater than that of MTA.29 Penetration of an endodontic material into the dentinal tubules results in improved marginal adaptation, increase mechanical retention, entombs residual bacteria and improved antibacterial effects owing to closer proximity of the material to the bacteria.30 Quick-set Capasio (Primus Consulting, Bradenton, FL) has been further developed and has been renamed as Quick-Set (Primus Consulting). The refinement has been performed via removal of the cationic surfactant from the liquid gel component, which was thought to affect its biocompatibility. Using murine dental papilla-derived odontoblast-like cell line (MDPC-23), Wei et al. observed that the in vitro cytotoxicity of Quick-Set was similar to that of WMTA.31 Ashraf et al. concluded that the in vitro osteogenic/dentinogenic differentiation potential of Quick-Set was favorable. 32 Generex A and B Generex A (Dentsply Tulsa Dental Specialities, Tulsa, Usa) and B are calcium-silicate-based materials with novel setting reactions. Generex A contains tricalcium silicate, dicalcium silicate, and tricalcium alumunate. Its composition is similar to that of MTA but for the fact that the powder is finer, and unique gels are used for mixing instead of water as is the case with MTA.25 Usage of the gel results in: improved handling characteristics and reduced setting time.26 Among the materials evaluated for their osteogenic potential (Generex A, Capasio, Ceramicrete, and MTA), only Generex A and MTA allowed primary osteoblast growth.25 In a study conducted by Porter et al, Generex A exhibited the shortest setting time (1.25 hrs) as compared to Capasio and Ceramicrete, which set in 2.5 hours. Generex A also emerged as the strongest among the other materials tested. 26 Endobinder Endobinder differs from MTA in that, MgO and CaO (cause undesirable expansion of the material), and Fe2O3 (causes tooth darkening) are eliminated from its composition. Al2O3 and CaCO3 are calcined at temperatures between 1315deg C and 1425d C, and are ground following which, Bismuth oxide is added to obtain radioopacity. Purity is ensured by eliminating traces of MgO, CaO, and Fe2O3.32, 33 Endobinder assisted early differentiation of a higher osteoblastic cell population in comparison to MTA. this, the authors attributed to the lower calcium hydroxide release from endobinder when compared with MTA.34 While slightly higher concentration of extracellular calcium can stimulate osteoblast cell viability, proliferation, differentiation, and function, an overload can be cytotoxic. 35 According to Oliveira et al., Endobinder exhibited better fluidity, improved handling properties, higher mechanical strength, and reduced porosity (with lower pore size) when compared with MTA.36 The material was biocompatible when tested in subcutaneous tissue of rats.37 Conclusion The past few years have witnessed the development of novel materials with a purpose of overcoming the disadvantages of MTA. Some are primarily composed of calcium silicate (Endobinder, Endosequence, Generex A and B, and iRoot BP Plus), some are primarily tricalciumsilicate-based (Bioaggregate, and Biodentine) or calcium-alumino-silicate based (Capasio and quickset), and one is a chemically bonded phosphate ceramic (Ceramicrete). The focus behind developing these materials has mainly been- improved physical and biological properties over the present gold standard i.e. MTA. While some of these novel materials have exhibited improved characteristics, more research in the form of in vivo and in vitro studies are required in this direction, in order to ascertain the same. Also, newer materials with a composition differing from that of MTA, may bring a fresh approach with regard to this application. 1

A Brief History of the People and Relations of the United States-Mexican Border :: Essays Papers

A Brief History of the People and Relations of the United States-Mexican Border Wind tugging at my sleeve feet sinking into the sand I stand at the edge where the earth touches ocean where the two overlap a gentle coming together at other times and places a violent clash Across the border in Mexico stark silhouette of houses gutted by waves, cliffs crumbling into the sea, silver waves marbled with spume gashing a hole under the border fence. Miro el mar atacar la cerca en Border Field Park con sus buchones de agua, an Easter Sunday resurrection of the brown blood in my veins. Oigo el llorido del mar, el respiro del aire, my heart surges to the beat of the sea. In the gray haze of the sun the gulls’ shrill cry of hunger, the tangy smell of the sea seeping into me.

Has Child Behavior Worsened Over the Years? Essay

â€Å"Is your child forgetful, irresponsible, moody, and prone to daydreaming? (Figure 1.1) Does he seem to lack motivation and become easily bored?† (Empowering Parents) Has the problem become worse than it was a year ago? A child’s behavior is defined solely by environmental factors such as; family, cultures, and everyday experiences. As a result, studies have shown that due to these factors, children’s behavior has become worse. â€Å"A child’s behavior may be a problem if it doesn’t match the expectations of the family or if it is disruptive.† (Family Doctor.org) Parents are children’s greatest role models. â€Å"Your children will see your example – positive or negative – as a pattern for the way life is to be lived.† (Rcmp.Grc.go) â€Å"The 1960 Census reported that nine percent of children lived in single parent families, compared with the 28% reported by 2000.† (Prb.org) In 2012, according to the Cen sus Bureau about 80% of children were raised by single mothers. Therefore, many disadvantages come from a single parent household. The American Academy of Pediatrics proposes that boys in a single household become more â€Å"aggressive† trying to full the â€Å"father’s role† in the household. If the mother is absent, the young girls try to become the â€Å"caretaker† looking out for her family. (Everydaylife.GlobalPost) This leads children to raise themselves, forcing them to give up their childhood. This also could lead them into trouble because the children wouldn’t know right from wrong which is leading up to child behavioral problems. Single parents are also often financially stressed, making it hard n children. Children will be able to read through your stress and as they grow older, some would want to help. This will lead the children into desperation – causing them to steal or maybe bringing in dirty money, money they have earned illegally. Parents today are also becoming younger and younger. Kids raising kids is drastic. The cons of this are these young parents trying to be friends with their children instead of coaching them. Everything these young parents listen to or do, they will let their children do the same, thinking this act is â€Å"cute.† Many people with argue that child behavior has improved because of education, the technology is better. â€Å"Education is great. Education is by far better today than a hundred years ago! The fields of learning have been opened up to boys and girls equally to seek out far greater possibilities than were even imaginable a hundred years ago. The Education now is a better  than before. We are not beaten and now we can use internet for Education.† – Alisham2002 (Debate.org) Though technology has improved, and today’s education is better, this has nothing to do with the behavior of this generation. Technology is a downfall; kids have access to everything and are actually becoming too independent on electronics. Culture and everyday experiences such as music and video games have had a huge impact of children’s behavior. Music videos and games have become extremely explicit. I’ve known and seen children dance provocatively and cussing up a storm like the rappers does. Whereas, my mom would have never went for that! In conclusion, child behavior has worsened over the years because of single parenting in households, teen parenting, and today’s music and culture. In earlier years, there was a limit to all of these things. There could be a passcode on your TV so no child would witness th ese explicit things. Today, parenting is terrible and so is children’s behavior. Works Citied: â€Å"Dealing With An Angry, Acting-Out Child?† Parenting Articles about Arguing & Fighting. N.p., n.d. Web. 16 June 2014. . â€Å"What You Can Do to Change Your Child’s Behavior.† Health Education. N.p., n.d. Web. 16 June 2014. . â€Å"The Rise-and Fall?-of Single-Parent Families.† The Rise-and Fall?-of Single-Parent Families. N.p., n.d. Web. 16 June 2014. . â€Å"Family Issues for Single Parents.† Everyday Life. N.p., n.d. Web. 16 June 2014. .

Analsysis of John Green;s The Fault in Our stars Essay

In 2013 it is predicted that 580,350 people will die from cancer (Howlader). Chances are any given person knows at least one person, who has suffered from cancer. Talking about cancer is not something that people willingly do. If you are unlucky enough to not know someone who has had cancer, reading The Fault in Our Stars by John Green will give you the emotions of losing someone dear to you to cancer. What makes this book worth reading because of it’s plot, the characters are relatable and give the reader meaning, and the book sticks in the readers mind even after finishing the book. The plot of The Fault of Our Stars tells the story of Hazel Grace who experiences a miracle that shrinks her ever growing tumors and buys her more years that she expected. The novel is based on the twist in Hazel’s life when she meets Augustus Waters, a cancer survivor, at a Cancer Kid Support group. The story follows the friendship and romance of Hazel and Augustus. The two grow together and share experiences and love for reading making their friendship and relationship become more solidified. The romance flourishes after Hazel has a medical issue due to the tumors in her lungs and explains to Augustus that she wants to meet her, and now his, favorite author in Amsterdam. Augustus uses his wish, presumably from the â€Å"Make a Wish Foundation,† to get himself, Hazel, and Hazel’s mother to Amsterdam. This trip is the climax in the relationship of Hazel and Augustus. They share their first kiss, and lose their virginities to each other. This is also the tipping point where we realize that Augustus is dying, Brodie 2 his cancer has reoccured and it appears to be incurable. After their trip we quickly see Augustus’ health go down a downward spiral, his caner getting worse and spreading throughout his body. The author then does the unexpected and ends the romance of Hazel and Augustus by having Augustus cancer overwhelm him and eventually take his life. Green follows Hazels life after his death showing her grief and her will to live. Augustus death gave her a new perspective on life. Wanting to fight her cancer more. The plot is overall strong and well thought out. The story is possible, while unlikely that two teenagers with terminal caner would travel to Amsterdam together, but still has the realistic nature that gives most people something to relate to. Having two teenagers with cancer fall in love gives the plot not only a twist at the end, but also something that everyone in their lives look for. It has hope for the people needing hope, love for the hopeless romantics, adventure for the adventure seekers, something for everyone can be found in this book. The characters Hazel Grace, and Augustus Waters, have aspects of their personalities that everyone can relate to. The author John Green specifically designed the characters to be relatable for all ages. Green gave Hazel a strong independent personality who doesn’t like seeing herself as being weak. Green wants to make Hazel a teenager, despite her terminal cancer. Green comments, â€Å"I wanted to establish that just because Hazel is sick and dying or whatever, she is still a teenager, and more generally she is still human and developing emotionally at the standard human rate, and not at some wildly increased rate of development that’s only available to you if you have incurable cancer. † (Questions). Green creates a character that has had things in her life happen that many teenagers will never experience. However he gives her â€Å"normal teenager† aspects where she does not enjoy physical contact with her mother. Giving her a real teenage Brodie 3 attitude makes her more relatable than a mature teenager who loves her parents and has terminal cancer. While Augustus seems to be the mature teenager who beat cancer, he still has his teen angst common in adolescence. He travels with Hazel against his parents wishes, he lies to Hazel about coming out of remission, and has attitude with a flight attendant when she asks him to remove an unlit cigarette from his mouth. While many teenagers wouldn’t go against their parents wishes especially when it comes to their wellbeing, lie to the woman they love about their cancer, and smoke unlit cigarettes to get across a metaphor, Green makes it clear that Augustus was a real person. He had pain and suffering that he didn’t lead on. Green says when asked why Augustus stops hiding his pain towards the end of his life, â€Å"I am really bothered by the idea that people in pain who are being wrenched from existence should be perpetually cheerful and compassionate about it. † (Questions). His point is that some people can only bottle up their pain for so long. This is something many teenagers with depression, and even adults can relate to. Memorability of a book or any form of media is important. Having quotes that can be used in everyday life, and some that are so deep that they make you think about yourself and the marks you leave on the world. Having strong quotes such as, â€Å"I’m in love with you, and I know that love is just a shout into the void, and that oblivion is inevitable, and that we’re all doomed and that there will come a day when all our labor has been returned to dust, and I know the sun will swallow the only earth we’ll ever have, and I am in love with you. † (Green, 128). The certain quotes that stick with someone, that initiate emotions, are important in any books. The emotions that can be drawn out of the reader, mainly bringing sadness towards the end when Brodie 4 Green does the worst possible thing to his characters by ending the life of Augustus, for some people this can spark intense emotions. Many people say to â€Å"not read this book in public† (Keane) due to the fact that many people have cried. Not expecting the twist ending, finding yourself shocked at the pain the other characters are feeling create an almost physical response from some readers. The effectiveness of a good book are based on the plot, characters, and memorability. While some of these are all based on personal preference it can be agreed that The Fault in Our Stars is, according to Time, an â€Å"instant classic. † Time magazine wrote, â€Å"(I can see) The Fault in Our Stars taking its place alongside Are You There God? It’s Me, Margaret in the young-adult canon. † Writing about such an emotional topic of cancer and on top of that writing about the love and the loss of two teenagers is a strong concept to tackle and release into the public. The words on the pages jump off and overall the book is worth reading due to the intense plot line, relatable characters, and the quotable passages. Brodie 5 Works Cited Bruni, Frank. â€Å"Kids, Books and a Five-Hankie Gem. † The New York Times 22 Feb. 2012, sec. Opinion Paged: n. pag. New York Times. Web. 2 Oct. 2013. Green, John. The Fault in Our Stars. New York: Dutton Books, 2012. Print. Green, John. â€Å"Questions about The Fault in Our Stars. † John Green. N. p. , n. d. Web. 7 Oct. 2013. . Howlader N, Noone AM, Krapcho M, Garshell J, Neyman N, Altekruse SF, Kosary CL, Yu M, Ruhl J, Tatalovich Z, Cho H, Mariotto A, Lewis DR, Chen HS, Feuer EJ, Cronin KA (eds). SEER Cancer Statistics Review, 1975-2010, National Cancer Institute. Bethesda, MD, http://seer. cancer. gov/csr/1975_2010/, based on November 2012 SEER data submission, posted to the SEER web site, 2013. Keane, Shannon Rigney. â€Å"Book Notes: The Fault in Our Stars by John Green. † Girls Leadership Institute. N. p. , 7 Aug. 2012. Web. 11 Oct. 2013. . Lockhart, E. â€Å"The Fault in Our Stars: John Green, Kate Rudd: 9781455869893: Amazon. com: Books. † Amazon. N. p. , n. d. Web. 7 Oct. 2013. . Time Magazine. â€Å"Reviews for The Fault in Out Stars. † John Green. N. p. , n. d. Web. 7 Oct. 2013. .