1,334 research outputs found
Comparison of Tooth Size Discrepancy of Three Main Ethnics in Malaysia with Bolton's Ratio
No full textThe objective of this study was to investigate the applicability of Bolton's ratios in orthodontic population of Malaysian main ethnics; Malay, Chinese and Indians. Ninety convenient samples consisting of 30 pre-orthodontic study casts from each ethnic that fits the inclusion criteria were selected. The greatest mesiodistal widths of each tooth from six to six for overall ratio and three to three for anterior ratio were measured using a digital callipers linked to Hamilton Arch Tooth System software to the nearest 0.01mm. Means of the ratios were calculated using Bolton analysis. One sample t-test statistic analysis was carried out to compare the means with Bolton values of anterior ratio and overall ratio and one-way ANOVA was used to analyze comparison between ethnic groups of the anterior ratio and the overall ratio with the level of statistical significance set at p < 0.05. However, there were no significant differences when comparing Bolton values with Chinese and Indian anterior and overall ratios. The Bolton standards could be applied to Malaysian Chinese, Indians and Malay's female. Subsequently, a specific standard should be used for the Malays orthodontic population.Article URL : http://www.ukm.my/jsm/pdf_files/SM-PDF-41-2-2012/17%20Aida%20Nur%20Ashikin.pd
‘Do larger molars and robust jaws in early hominins represent dietary adaptation?’ A New Study in Tooth Wear
No full textDiet imposes significant constraints on the biology and behaviour of animals. The fossil record suggests that key changes in diet have taken place throughout the course of human evolution. Defining these changes enables us to understand the behaviour of our extinct fossil ancestors. Several lines of evidence are available for studying the diet of early hominins, including craniodental morphology, palaeoecology, dental microwear and stable isotopes. They do, however, often provide conflicting results. Using dental macrowear analysis, this new UCL Institute of Archaeology project will provide an alternative source of information on early hominin diet. Dental macrowear has often been used to analyse diet in archaeological populations, but this will be the first time that this type of detailed study has been applied to the early hominin fossil record
Orientation and deformation of mineral crystals in tooth surfaces
No full textTooth enamel is the hardest material in the human body, and it is mainly composed of hydroxyapatite (HAp)-like mineral particles. As HAp has a hexagonal crystal structure, X-ray diffraction methods can be used to analyze the crystal structure of HAp in teeth. Here, the X-ray diffraction method was applied to the surface of tooth enamel to measure the orientation and strain of the HAp crystals. The c-axis of the hexagonal crystal structure of HAp was oriented to the surface perpendicular to the tooth enamel covering the tooth surface. Thus, the strain of HAp at the surface of teeth was measured by X-ray diffraction from the (004) lattice planes aligned along the c-axis. The X-ray strain measurements were conducted on tooth specimens with intact surfaces under loading. Highly accurate strain measurements of the surface of tooth specimens were performed by precise positioning of the X-ray irradiation area during loading. The strains of the (004) lattice plane were measured at several positions on the surface of the specimens under compression along the tooth axis. The strains were obtained as tensile strains at the labial side of incisor tooth specimens. In posterior teeth, the strains were different at different measurement positions, varying from tensile to compressive types
Bill to Eliza Ann Collins Edgar
No full textReceipted bill from H. Charles Cope, Boonville, Missouri, to Eliza Ann Collins Edgar for goods purchased from May 1-July 24 1855-1856. Includes cost for horse and hack, carriage. Bill receipted by William. C. Ewing. Another bill for Mrs. Eliza Edgar with Jones Company, J.W. and W. W. Jones for goods, including items and cost, for women's gloves, kid gloves, boys gloves, soap, pins, hair brush, tooth brush, comb, Kathairon hair dressing, linens, thimble, scissors, buttons, belts, collar, various types of cloth, callico, silk, and sewing supplies, ribbons, hose, jeans, corset, silk bow, boots, capes, etc. Business, finance, women, children. HL introduction page overlaid by document. Bill in English, handwritten, 1pp/fr
Obliteração pulpar em incisivo decíduo traumatizado
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde. Programa de Pós-Graduação em Odontologia.Este estudo descritivo retrospectivo em incisivos centrais superiores decíduos traumatizados teve por objetivo, verificar a ocorrência de obliteração pulpar, o tempo decorrido entre o trauma e o desenvolvimento desta seqüela, a presença de alteração de cor da coroa bem como a freqüência de necrose pulpar secundária nos dentes obliterados, além de avaliar a existência de associação entre a obliteração e o sexo, a idade do paciente no momento do trauma dental, o tipo e a reincidência de trauma. Para isto, realizou-se uma pesquisa desenvolvida a partir dos dados clínicos e radiográficos dos prontuários de pacientes participantes do Programa de Atendimento ao Paciente Traumatizado da Universidade Federal de Santa Catarina, entre agosto de 1998 e agosto de 2007. Seguindo os critérios de elegibilidade, foram incluídos 112 dentes de 82 crianças. Destes, 60 (53,6%) apresentavam obliteração pulpar, sendo que em 58,3% dos casos esta foi diagnosticada em até 12 meses após o trauma. A associação entre alteração de cor da coroa e obliteração pulpar foi confirmada (p<0,001), e não houve casos de necrose pulpar secundária. Não se observou associação estatística entre as variáveis sexo e idade dos pacientes, bem como tipo e recorrência de trauma em relação a obliteração pulpar. Os resultados deste estudo permitem concluir que a ocorrência de obliteração pulpar em dentes decíduos traumatizados é alta e a proservação clínica e radiográfica periódica é a melhor conduta para esta seqüela
Peripheral neuropathies of childhood
No full textIncludes synopsis.Incldues bibliographical references (p. 195-220).Peripheral nerve disease was described by Galen (AD 130-200) over a thousand years ago.(3) Detailed anatomical illustrations were documented by Andreas Vesalius in his major work 'De humani corporis fabrica' in 1543.(4) Over the last two centuries an explosion in knowledge in the area has occurred, with a further exponential increase in the last 20 years mostly related to understandings in the field of molecular genetics.(5) Although some degree of diagnostic closure was possible for a number of the hereditary peripheral neuropathies, this has not been the end point of knowledge but only the beginning
Avaliação da presença de guia de desoclusão lateral e protrusiva da mandíbula
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Programa de Pós-Graduação em Odontologia, Florianópolis, 2014.Neste estudo avaliou-se a presença de guias de lateralidade e protrusão em alunos do curso de Odontologia da Universidade Federal de Santa Catarina. Participaram da pesquisa, 187 voluntários, com idade média de 22 anos, de ambos os sexos. Os mesmos foram submetidos a questionamentos sobre tratamento ortodôntico prévio e disfunção têmporo-mandibular, ausência e/ou agenesia dentária, bem como foram submetidos ao exame clínico por um operador calibrado para observar a presença ou ausência das guias citadas, tanto do lado direito como do lado esquerdo. Os indivíduos foram classificados como guia de desoclusão oclusal do tipo canina, em grupo ou em outro tipo de guia. Do lado direito, possuíam guia em canino 43,3%; guia em grupo apenas 4,8% e o restante possuíam um outro dente como guia (41,2%). Já do lado esquerdo, 51,8% apresentavam guia em canino; 0,5% em grupo e o restante tinham outro dente como guia (34,8%). Guia lateral canina bilateral foi presente em 40,1%. Em relação à presença de guia anterior, 60,4% dos participantes a possuíam e esta obteve uma forte associação com a prévia realização de tratamento ortodôntico (pAbstract : In this study evaluated the presence of lateral and protrusive guidance in Dentistry students, from Federal University of Santa Catarina. The research involved 187 volunteers with an average age of 22 years, both gender. They were questioned about temporomandibular dysfunction and previous orthodontic treatment, absence and / or dental agenesis, and also underwent a clinical examination by a calibrated operator to observe the presence or absence of guidance, at both sides. The subjects were classified by their guidance occlusal protection type as canine, group or other type of guide . At the right side, canine guidance acquired 43,3%; guide group only 4,8% and another tooth as a guidance 41,2%. At the left side were found 51,8% with canine guidance , 0,5% group and another type of guide obtained 34,8%. Bilateral canine guidance was present in 40,1%. Regarding the presence of anterior guidance, 60,4% of participants leading a strong association with the prior execution of orthodontic treatment (p< 0,006) . No other association was found with types of orthodontic treatment and temporomandibular disorders, except for the presence of in the left canine guidance and make come true orthodontic treatment, which obtained a weak association (p<0,038 %). In addition, there was association between female gender and existence of any condition of dysfunction. Thus, there was no correlation between any type of guide and problems for patient, as well as presence of many different guides types in most of people surveyed
Immediate oral surgical management of external dental fistula : Technical note of immediate tooth autotransplantation
No full textTooth autotransplantation, that is the surgical movement of a tooth from its original location to another site within the same person, is an alternative to dental implantation because it can save time, provide faster healing and function, and has esthetic advantages. A unique sensory system can be maintained, and the procedure promotes proper healing of the periodontal environment. We report on a case of external dental fistula with apical periodontitis, in which immediate tooth autotransplantation of the right mandibular posterior tooth (tooth 47) was performed with a favorable outcome 6 years postoperatively. An important advantage of this procedure is that the transplanted tooth functions early at the recipient site and this procedure is minimally invasive therapy for apical periodontitis of mandibular molars accompanied with an external dental fistula. (C) 2021 Asian AOMS, ASOMP, JSOP, JSOMS, JSOM, and JAMI. Published by Elsevier Ltd. All rights reserved
The Higgs discovery potential of ATLAS
No full textHiggs boson production and decay at the LHC is described, together with related ATLAS search channels, in order to provide an overview of the ATLAS Higgs discovery potential
Tecnologias de informação e comunicação em odontologia: desenvolvimento de um aplicativo auxiliar no ensino
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde. Programa de Pós-Graduação em OdontologiaAtualmente, o modelo formador da odontologia traz a perspectiva do equilíbrio entre excelência técnica e relevância social e está apoiado em modelos pedagógicos mais dialógicos e interativos, na adoção de metodologias ativas de ensino-aprendizagem e no professor como facilitador do processo de construção do conhecimento. Dentre as metodologias de ensino-aprendizagem, existem as que são baseadas nas tecnologias de informação e comunicação (TIC) como uma nova possibilidade à educação, sustentada na construção do conhecimento pelo aluno e no desenvolvimento de novas competências, como capacidade de enfrentar o novo, criatividade, autonomia e comunicação. Dentro deste contexto, situa-se este trabalho de pesquisa que tem por objetivo apresentar a trajetória da construção de um aplicativo para estudo dos determinantes da doença cárie dentária e suas características operacionais, além de demonstrar a utilização das TIC como instrumentos de apoio ao processo de ensino-aprendizagem em odontologia, por meio do uso deste sistema. O aplicativo foi desenvolvido por meio de um trabalho interdisciplinar do qual participaram profissionais das áreas de Odontologia, Sistemas de Informação e Design. Os pesquisadores da área da Odontologia forneceram o referencial teórico que fundamentou as regras necessárias para o desenvolvimento do aplicativo. Os profissionais das áreas de Sistemas de Informação e de Design codificaram o sistema utilizando as tecnologias HTML com CSS e Java para o desenvolvimento estrutural das páginas, Java Script para o desenvolvimento das interatividades e MYSQL para o desenvolvimento do banco de dados. O aplicativo foi utilizado por alunos da 6ª fase do Curso de Graduação em Odontologia da Universidade Federal de Santa Catarina, numa disciplina que aborda conteúdos de Odontologia em Saúde Coletiva, no contexto da escola de ensino fundamental. Sua utilização foi relatada através de uma pesquisa qualitativa com os alunos de odontologia, cujo processo investigativo ancorou-se na técnica do grupo focal e análise dos dados foi realizada seguindo os pressupostos da Análise de Conteúdo de Bardin, com o auxílio do software NVivo® 9.0. A análise dos dados evidenciou as vantagens da utilização das TIC no ensino da odontologia, como instrumentos fundamentais e facilitadores deste processo, percebendo-se a importância e o potencial do seu uso na formação dos alunos frente à necessidade de se adaptarem ao contexto atual de constantes avanços tecnológicos e rápida expansão dos conhecimentos científicos.Currently, the dental educational model brings the perspective of the balance between technical excellence and social relevance. It is supported by dialogical strategies and interactive methodologies in an active teaching-learning process. The teacher is considered a facilitator of the process of knowledge construction. Among the methods of teaching and learning, there are those that are based on information and communication technologies (ICT) as a new possibility to education developing new skills, such as: ability to face the new, creativity, autonomy and communication. Within this context this research which aims to demonstrate the path of building an application to studying the determinants of dental caries and its operational characteristics, and demonstrate the use of ICT as tools to support the teaching-learning process in dentistry. The application was developed by an interdisciplinary work, which was attended by Dentistry, Information Systems and Design professionals. Dentistry researchers provided the theoretical framework that oriented the rules for the application development. The professionals in the areas of Information Systems and Design have coded the system using technologies with CSS HTML and Java to the structural development of the pages, Java Script for the interactivity and MySQL for the database. The application was used by students from the 3rdd year of the Federal University of Santa Catarina Dental School, in a Public Oral Health course, in the context of an elementary school. Its use was reported by a qualitative study with the dental students. Data collection was conducted through the focus group technique and data analysis was carried out following the Content Analysis statements, utilizing NVivo 9.0® software. The results showed the advantages of using ICTs in dental education as basic tools and facilitators of teaching-learning process. It was revealed the importance and the potential of the ICT's use to face the demands of constant advances of technology and the fast expansion of scientific knowledge
- …
