Thesis (M.S.)--The University of Michigan, 1985.

published_or_final_version / Endodontics / Master / Master of Dental Surgery

The dental field shows proliferation in the market of new adhesives. The purpose of this study is to evaluate the mechanical properties on total restoration, based on the manufacturer's technical specifications, experimental and mechanical test results. The optimal dentist's selection will be when the most appropriate adhesive can be chosen for one specific restoration, avoiding wasted time, material and exposure to marginal infections with a failure restoration. This research was developed in stages. The first step is the study of the tooth morphological information. Following, there is the structure identification type and the chemical composition of six different pure adhesives. Next, perform the X-R Diffraction, Energy Disperse Spectroscopy (EDS), and Scanning Electron Microscopy (SEM). The final step is to perform the mechanical test, computer simulation, and discuss the results to obtain the best dental adhesive with and the new finding. Result: The samples show an amorphous structure and a chemical composition in the X-R Diffraction, SEM and EDS experiments. The mechanical test shows real mechanical properties under tension and sheer rupture stress. Poisson ratio, strain, and another relationship will be used in the computer simulation test. Results will be reflected in the Discussion and Conclusion. Significance: The first conclusion is that the amorphous structure is present in all six adhesives experiments. In addition, it shows strong possibilities of bonding with another neighbor's molecules. The discussion will be extended to the bonding advantages for this type of structure in the total dental restoration. / Findings: First, we found that the time delay of photo polymerization was controlled with the variable water evaporation of the etching treatment. In addition, it was found that the variable size of the wavelength of the curing light obtained better molecular organization and avoided internal stress and bonding defect. Lastly, the chemical composition was a variable that provided the opportunity to predict the type of bond and strength. / by Raul Vargas. / Thesis (Ph.D.)--Florida Atlantic University, 2008. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2008. Mode of access: World Wide Web.

O diagnóstico das lesões incipientes de erosão em esmalte é difícil de ser realizado e, em situações clínicas, poderá ocorrer a colagem de braquetes em superfícies erodidas. Este trabalho in vitro avaliou a adesão de braquetes ortodônticos ao esmalte dentário bovino hígido e previamente erodido, utilizando dois materiais para colagem. Os fatores em estudo foram condição prévia do esmalte em 2 níveis (com e sem erosão) e tipo de material de colagem em 2 níveis (Transbond XT e Fuji Ortho LC). A amostra foi composta por 160 coroas de incisivos bovinos, sendo metade dela submetida a desafio erosivo para formação de lesões artificiais de erosão e a outra metade permaneceu hígida. Na ciclagem erosiva as coroas foram imersas 8X/dia em Coca-cola® (10 min), seguido da imersão em saliva artificial (2 h), durante 5 dias. A outra metade da amostra ficou em saliva artificial por 5 dias. Braquetes de incisivo central superior foram colados às coroas hígidas (H) e erodidas (E), seguindo orientações dos fabricantes de cada material. As variáveis de resposta foram resistência ao cisalhamento e índice de remanescente adesivo (IRA). Os dados de resistência ao cisalhamento foram analisados por ANOVA 2 critérios e Teste de Tukey (p<0,05). Os resultados, expressos em megapascal, não mostraram diferenças na resistência ao cisalhamento entre esmalte erodido e hígido, tanto no grupo colado com resina (RH = 15,25 +3,72; RE = 15,79 +4,41) quanto colado com ionômero (IH = 10,70 +3,73; IE = 11,26 +3,70). A resina apresentou resistência à colagem superior ao ionômero. Na comparação do índice de remanescente adesivo, por meio do teste de Mann Whitney, o esmalte erodido apresentou valores mais altos para o IRA, evidenciando uma maior quantidade de material remanescente no esmalte, tanto no grupo colado com resina (p=0,044) quanto com ionômero (p<0,001). Conclui-se que a presença da lesão de erosão não interfere na resistência ao cisalhamento de braquetes colados ao esmalte tanto com resina quanto com cimento de ionômero de vidro. No entanto, independentemente do material de colagem, o índice de remanescente adesivo evidenciou uma maior adesão ao esmalte com erosão. / The diagnosis of initial erosion lesions on enamel is difficult and in some clinical situations, the professional bonds brackets to eroded surfaces without noting.This in vitro study evaluated the bond strength of orthodontic brackets bonded to eroded and sound bovine enamel with two different materials. The factors under study were enamel condition in two levels (with and without erosion) and type of bonding material in two levels (Transbond® XT and Fuji Ortho LC). The sample consisted of 160 bovine lower incisor teeth, half of the specimens was subjected to erosive challenge to form artificial erosive lesions and the other half remained sound. In the erosive cycling tooth crowns were immerged 8x/day in Coca-cola® (10 min), followed by immersion in artificial saliva for (2 h), for 5 days. The other half of the sample was maintained in artificial saliva for 5 days. At sequence, brackets were bonded to eroded (E) and sound (S) enamel, according to manufacturing recommendations of each material. The response variables were shear bond strength and adhesive remnant index (ARI). Shear bond strength data were analyzed by Two-way ANOVA and Tukeys test (p<0,05). The results, expressed in megapascal, did not show any difference between eroded and sound enamel, in both composite resin (RS = 15,25 +3,72; RE = 15,79 +4,41) and glass ionomer (IS = 10,70 +3,73; IE = 11,26 +3,70) groups. Composite resin showed higher shear bond strength compared to glass ionomer cement. In the comparison of adhesive remnant index using Mann Whitney test, eroded enamel presented higher scores for ARI, showing greater amount of material remaining on enamel, in both resin (p=0,04) and ionomer (p<0,001) groups. It was concluded that the presence of erosion lesions did not interfere on shear bond strength of brackets bonded to enamel with composite resin or glass ionomer cement. However, independently of the bonding material, adhesive remnant index showed higher bond strength to eroded enamel.

O diagnóstico das lesões incipientes de erosão em esmalte é difícil de ser realizado e, em situações clínicas, poderá ocorrer a colagem de braquetes em superfícies erodidas. Este trabalho in vitro avaliou a adesão de braquetes ortodônticos ao esmalte dentário bovino hígido e previamente erodido, utilizando dois materiais para colagem. Os fatores em estudo foram condição prévia do esmalte em 2 níveis (com e sem erosão) e tipo de material de colagem em 2 níveis (Transbond XT e Fuji Ortho LC). A amostra foi composta por 160 coroas de incisivos bovinos, sendo metade dela submetida a desafio erosivo para formação de lesões artificiais de erosão e a outra metade permaneceu hígida. Na ciclagem erosiva as coroas foram imersas 8X/dia em Coca-cola® (10 min), seguido da imersão em saliva artificial (2 h), durante 5 dias. A outra metade da amostra ficou em saliva artificial por 5 dias. Braquetes de incisivo central superior foram colados às coroas hígidas (H) e erodidas (E), seguindo orientações dos fabricantes de cada material. As variáveis de resposta foram resistência ao cisalhamento e índice de remanescente adesivo (IRA). Os dados de resistência ao cisalhamento foram analisados por ANOVA 2 critérios e Teste de Tukey (p<0,05). Os resultados, expressos em megapascal, não mostraram diferenças na resistência ao cisalhamento entre esmalte erodido e hígido, tanto no grupo colado com resina (RH = 15,25 +3,72; RE = 15,79 +4,41) quanto colado com ionômero (IH = 10,70 +3,73; IE = 11,26 +3,70). A resina apresentou resistência à colagem superior ao ionômero. Na comparação do índice de remanescente adesivo, por meio do teste de Mann Whitney, o esmalte erodido apresentou valores mais altos para o IRA, evidenciando uma maior quantidade de material remanescente no esmalte, tanto no grupo colado com resina (p=0,044) quanto com ionômero (p<0,001). Conclui-se que a presença da lesão de erosão não interfere na resistência ao cisalhamento de braquetes colados ao esmalte tanto com resina quanto com cimento de ionômero de vidro. No entanto, independentemente do material de colagem, o índice de remanescente adesivo evidenciou uma maior adesão ao esmalte com erosão. / The diagnosis of initial erosion lesions on enamel is difficult and in some clinical situations, the professional bonds brackets to eroded surfaces without noting.This in vitro study evaluated the bond strength of orthodontic brackets bonded to eroded and sound bovine enamel with two different materials. The factors under study were enamel condition in two levels (with and without erosion) and type of bonding material in two levels (Transbond® XT and Fuji Ortho LC). The sample consisted of 160 bovine lower incisor teeth, half of the specimens was subjected to erosive challenge to form artificial erosive lesions and the other half remained sound. In the erosive cycling tooth crowns were immerged 8x/day in Coca-cola® (10 min), followed by immersion in artificial saliva for (2 h), for 5 days. The other half of the sample was maintained in artificial saliva for 5 days. At sequence, brackets were bonded to eroded (E) and sound (S) enamel, according to manufacturing recommendations of each material. The response variables were shear bond strength and adhesive remnant index (ARI). Shear bond strength data were analyzed by Two-way ANOVA and Tukeys test (p<0,05). The results, expressed in megapascal, did not show any difference between eroded and sound enamel, in both composite resin (RS = 15,25 +3,72; RE = 15,79 +4,41) and glass ionomer (IS = 10,70 +3,73; IE = 11,26 +3,70) groups. Composite resin showed higher shear bond strength compared to glass ionomer cement. In the comparison of adhesive remnant index using Mann Whitney test, eroded enamel presented higher scores for ARI, showing greater amount of material remaining on enamel, in both resin (p=0,04) and ionomer (p<0,001) groups. It was concluded that the presence of erosion lesions did not interfere on shear bond strength of brackets bonded to enamel with composite resin or glass ionomer cement. However, independently of the bonding material, adhesive remnant index showed higher bond strength to eroded enamel.

Thesis (M.S.D.)--Indiana University School of Dentistry, 2009. / Title from PDF t. p. (viewed Feb. 9, 2009) Advisor(s): Jeffrey A. Platt, Chair of the Research Committee, Tien-Min Gabriel Chu, Michael A. Cochran, Bruce A. Matis, Burak Taskonak, B. Keith Moore. Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 71-76).

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

Thesis (M.Sc.Dent.)--University of Adelaide, Dental School, 2004. / "April 2004" Includes bibliographical references (leaves 73-87).

Thesis (M.S.)--University of Michigan, 1970.

Thesis (M.S. (Orthdontics))--University of Tennessee Center for the Health Sciences, Memphis, 1980. / Spine title. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 54-59).