Resumo: A técnica de desgastes interproximais é um procedimento ortodôntico freqüente na prática ortodôntica, no qual parte do esmalte dental da área interproximal é removida, e para que este seja realizado com segurança é importante estimar a espessura de esmalte presente. Este estudo descreve a espessura do esmalte nas faces mesial e distal dos dentes permanentes anteriores e posteriores e avalia as correlações desta medida entre os dentes do arco superior e inferior, entre os dentes da região anterior e posterior e entre as faces mesial e distal. Foram selecionados 34 adultos jovens (21 mulheres e 13 homens) entre 13 a 24 anos de idade. Radiografias periapicais dos incisivos centrais, laterais e caninos e interproximais dos pré-molares e molares, superiores e inferiores do lado direito, foram digitalizadas em um scanner de mesa, para posterior mensuração da espessura do esmalte nas faces mesiais e distais, utilizando o software "Image tool". Os dados obtidos foram avaliados estatisticamente pelos testes Kolmorov-Smirnov, t de Student e de Pearson e mostraram que os valores médios de espessura do esmalte nas faces proximais tornam-se progressivamente maiores distalmente, nos dentes posteriores o esmalte é mais espesso que nos anteriores 5,36 mm no arco inferior e 4,48mm no superior. A espessura do esmalte nas faces distais é significantemente maior que nas mesiais. A espessura total do esmalte interproximal de uma hemiarco é de 14,87 mm para os dentes superiores e 14,78 mm para os inferiores. Correlações positivas, estatisticamente significantes, foram encontradas entre as espessuras do esmalte das faces mesial e distal, dos dentes anteriores e posteriores, assim como, em grande parte dos valores obtidos para os dentes dos arcos superior e inferior. / Abstract: Interproximal reduction is a frequent orthodontic procedure in clinical practice, in which part of dental enamel in the interproximal area is removed. To perform safe interproximal reduction, it is important to estimate the actual enamel thickness. This study describes the enamel thickness in mesial and distal surfaces of both anterior and posterior teeth and evaluates possible correlations between the measurements obtained from maxillary and mandibular arches, from anterior and posterior regions, as well as mesial and distal surfaces. The sample comprised 34 young adults (21 females, 13 males) 13 to 24 years old. Periapical radiographs from right central and lateral incisors and canines, and bitewing radiographs from pre-molars and molars, from maxillary and mandibular arches, were digitalized and the data required for the research were calculated in the Image tool software. The analysis of data was made using Kolmorov-Smirnov test, Student T test and Pearson Correlation Coefficient and showed that averages of enamel thickness in proximal surfaces becomes progressively thicker distally, total enamel in posterior teeth was greater than anterior 5,36 mm for mandibular arch and 4,48 mm for maxillary. Enamel thickness was consistently greater on the distal surface than on the mesial. Total enamel in proximal surfaces was 14,87 mm for maxillary teeth and 14,78 mm for mandibular teeth. Positive correlation, statistically significant, was found between the enamel thickness of the mesial and distal surfaces, anterior and posterior teeth, as well as, to a large extent of the values obtained for teeth of mandibular and maxillary arches. / Orientador: Luiz Gonzaga Gandini Júnior / Coorientador: Marcelo Gonçalves / Banca: Ana Claudia Moreira Mello / Banca: Lídia Parsekian Martins / Mestre

Orientador: Alberto Carlos Botazzo Delbem / Coorientador: Marcelle Danelon / Banca: Denise Pedrini / Banca: Ana Carolina Magalhães / Resumo: Objetivo: Analisar in vitro a energia livre de superfície ( s) no esmalte dentário após o tratamento com diferentes concentrações de Trimetafosfato de sódio (TMP) ou Glicerofosfato de cálcio (CaGP), exposto ou não a solução contendo cálcio (Ca) e fosfato (PO4), assim como determinar a adsorção de TMP, CaGP, Ca e PO4 ao esmalte dentário. Método: Blocos de esmalte bovino (n=192; 24 blocos/grupo) planificados e polidos foram tratados (2 mL/bloco/2 minutos) com TMP (0, 1, 3 e 9%) ou CaGP (0, 0,25, 0,5 e 1%), expostos ou não a solução contendo Ca/PO4. TMP, CaGP, Ca e PO4 foram analisados nas soluções antes e após o tratamento para calcular a adsorção ao esmalte. A s, os componentes apolar ( sLW) e polar ( sAB), e ácido/base ( s+/ s ) foram calculados pelo ângulo de contato de três líquidos sondas (água, diiodometano e etilenoglicol). Os dados foram submetidos à ANOVA seguido pelo teste Student-Newman-Keuls (p<0,05). Resultados: A adsorção de TMP foi dose-dependente (p<0,001) e reduziu a s e sAB, e aumentou a s, quando comparado ao grupo sem TMP (p<0,001). A solução contendo Ca/PO4 aumentou a s (p<0,050) e a sAB (p<0,001) e reduziu a s (p<0,001). Houve correlação entre a adsorção de TMP e Ca (r = 0,916; p<0,001) e P (r = 0,899; p<0,001) ao esmalte. A adsorção de CaGP ao esmalte foi dose-dependente (p<0,001) diminuindo a s, sLW e s quando comparado ao grupo sem CaGP (p<0,001). Quando exposto à solução de Ca/PO4, houve aumento da sLW e s, e diminuição da sAB (p<0,001), sem adsorção... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Objective : I n vitro analysis of free surface enamel ( g s ) i n dental enamel after treatment with different concentrations of sodium trimetaphosphate (TMP) or calcium glycerophosphate (CaGP), exposed or not to the solution containi ng calcium (Ca) and ph osphate ( PO 4 ), as well as to determine the adsorption of TMP, CaGP, Ca and P O 4 to the dental enamel. Design: Bovine enamel blocks (n = 192; 24 blocks/group) planned were treated (2 mL/ block; 2 minutes) with TMP (0, 1, 3 e 9%), CaGP (0, 0.25, 0.5 e 1 %) ex posed or not to the solution containing CaPO 4 were analyzed in the solutions before and after the treatment will be de- termined for the calculation of the adsorption of these to the enamel . The g s and their components g s LW Lifshitz - van der Waals surface tens ion component, g s AB and Lewis acid - base interaction ( g s + / g s - ) was calculated by measuring the contact angles of three liquids probes (deionized water, diiodomethane and ethylene gly- col). The data were submited to ANOVA followed by Student - Newman Keuls tes t (p<0.05). Results: The adsorption of TMP was dose - dependent (p<0.001) re- duced the g s and g s AB when compared to the group without TMP (p<0.001). The solution containing Ca/PO 4 increased the g s, g s AB and reduced the g s - (p<0.001). There was a correlation b etween adsorption of TMP and Ca (r = 0.916; p<0.001) and P (r = 0.899; p<0.001) to the enamel. The adsorption of CaGP to the enamel was dose - dependent (p<0 . 001) reduc... (Complete abstract click electronic access below) / Mestre

Includes bibliographical references (leaves [1-20]). A systematic analysis of wear involving the in vitro analysis of the wear of standard composite resin and glass ionomer cements restorations under controlled conditions; and, the qualitative and quantitative investigation of wear over a range of pH's and loads which might be encountered clinically in order to develop a "wear map" of the micromorphology of wearing teeth and restorations and a systematic modeling of wear rates.

Thesis (Ph.D.)--University of Melbourne, Melbourne Dental School, Faculty of Medicine, Dentistry and Health Sciences, 2010. / Typescript. Includes bibliographical references.

published_or_final_version / abstract / toc / Dentistry / Master / Master of Philosophy

Copies of author's previously published articles inserted. / Bibliography: leaves 136-155. / xxi, 180 leaves : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Examines tooth-to-tooth contact under controlled experimental conditions that simulate bruxism. Focuses on the wear characteristics of enamel and factors influencing the nature and extent of human enamel wear. / Kaidonis, John Aristidis / Thesis (Ph.D.)--University of Adelaide, Dept. of Dentistry, 1995?

Includes bibliographical references (leaves [1-20]). / xxi, 168, [20] leaves : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / A systematic analysis of wear involving the in vitro analysis of the wear of standard composite resin and glass ionomer cements restorations under controlled conditions; and, the qualitative and quantitative investigation of wear over a range of pH's and loads which might be encountered clinically in order to develop a "wear map" of the micromorphology of wearing teeth and restorations and a systematic modeling of wear rates. / Thesis (Ph.D.)--University of Adelaide, Dept. of Dentistry, 2001

Diss. (sammanfattning) Stockholm : Karol. inst. / Härtill 6 uppsatser.

Thesis (M.S.)--University of Michigan, 1979.

Thesis (doctoral)--Rijksuniversiteit te Groningen.