Influência da configuração e do bisel em esmalte bovino, nos preparos cavitários de classe v, para restaurações de resina composta compactável: estudo in vitro da infiltração marginal
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Data
2001-05-29
Autores
Carvalho, João Cândido de [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O objetivo deste trabalho foi avaliar o selamento em cavidades de classe V localizadas em esmalte de dentes bovinos, empregando-se teste de microinfiltração, levando-se em consideração os fatores, configuração do preparo cavitário, o tratamento das paredes de esmalte com a presença ou não de bisel e o emprego de uma resina fluida associada a uma resina campactável. Foram selecionados 80 dentes bovinos, limpos, seccionados os terços apicais, removendo-se a polpa radicular e coronária e irrigados com soro fisiológico. Os ápices foram vedados com resina composta e os dentes receberam uma base de resina acrílica e foram conservados em freezer a -18ºC até o momento de uso. Após os preparos, os mesmos foram restaurados, usando-se condicionamento ácido/adesivo Prime Bond NT, resina compactável SureFil -Dentsply LD Caulk Co e em metade dos corpos-de-prova a resina fluida - Flow It - Jeneric Pentron. Os corpos-de-prova foram termociclados à temperatura de 5ºC l 2ºC e 55ºC l 2ºC por 30s, e após, imersos em Rodamina B 2% por 24h; lavagem em água corrente por 20min para remoção do corante e secagem. Em uma cortadeira foram realizados dois cortes no sentido vestíbulo lingual para avaliação em estereomicroscópio por dois observadores, que atribuíram escores de acordo com os graus de infiltração marginal. Foram empregados os métodos estatísticos Kruskal-Wallis não paramétricos, comparação múltipla de Tukey e Mann-Whitney com nível de significância de 5%. A metodologia empregada para avaliar a infiltração marginal permitiu concluir que: 1- a configuração do preparo cavitário (grupos I e III) não influencia o grau de infiltração marginal; 2- a presença de bisel, para o preparo em forma de caixa (grupo II) mostrou melhora de comportamento, com redução estatisticamente significante do grau de infiltração marginal...
The aim of this study was to evaluate the class V cavity sealing located in enamel of bovine teeth using microleakage tests considering the factors, cavity preparation configuration, enamel walls treatment with or without the bevel and the use of a flow composite resin together with a packable composite resin. Eighty clean bovine teeth, seccioned on the apical third without the root and coronary pulp were used. The apex were sealed with composite resin and the teeth were embedded in an acrylic resin and stored in freezer at a temperature of –18oC until the moment of their use. After the cavity preparation the teeth were filled using the acid/adhesive etching Prime Bond NT, Surefill Dentsply LD Caulk packable composite resin and Flow It – Generic Pentron – composite resin. Then the specimens suffered temperature cycles of 5oC ± 2oC and 55oC± 2oC for 30 seconds, and after that they were immersed in Rodamin B 2% dye for 24 hours followed by water rinsing and drying. Two buccal lingual sections were made to be evaluated by two observers using a stereomicroscope. The two observers attributed scores to the marginal leakage degrees. Non parametric Kruskal Wallis and the multiple comparison Tukey an Mann-Whitney statistical tests with 5% significance were utilized. Through this methodology it is possible to conclude that: 1. Groups I and III did not show differences according to marginal microleakage regarding the cavity preparation configurations; 2. the bevel presence for the conventional cavity preparation (groups I and II) showed better results with statistically significant marginal leakage degree reduction; 3. the bevel presence for the tear drop cavity preparation (groups III and IV) did not show better results according to the statistical methods; the use of the flow composite was favorable only for group III (tear drop cavity preparation without bevel); 5. the best results were observed on the group II.
The aim of this study was to evaluate the class V cavity sealing located in enamel of bovine teeth using microleakage tests considering the factors, cavity preparation configuration, enamel walls treatment with or without the bevel and the use of a flow composite resin together with a packable composite resin. Eighty clean bovine teeth, seccioned on the apical third without the root and coronary pulp were used. The apex were sealed with composite resin and the teeth were embedded in an acrylic resin and stored in freezer at a temperature of –18oC until the moment of their use. After the cavity preparation the teeth were filled using the acid/adhesive etching Prime Bond NT, Surefill Dentsply LD Caulk packable composite resin and Flow It – Generic Pentron – composite resin. Then the specimens suffered temperature cycles of 5oC ± 2oC and 55oC± 2oC for 30 seconds, and after that they were immersed in Rodamin B 2% dye for 24 hours followed by water rinsing and drying. Two buccal lingual sections were made to be evaluated by two observers using a stereomicroscope. The two observers attributed scores to the marginal leakage degrees. Non parametric Kruskal Wallis and the multiple comparison Tukey an Mann-Whitney statistical tests with 5% significance were utilized. Through this methodology it is possible to conclude that: 1. Groups I and III did not show differences according to marginal microleakage regarding the cavity preparation configurations; 2. the bevel presence for the conventional cavity preparation (groups I and II) showed better results with statistically significant marginal leakage degree reduction; 3. the bevel presence for the tear drop cavity preparation (groups III and IV) did not show better results according to the statistical methods; the use of the flow composite was favorable only for group III (tear drop cavity preparation without bevel); 5. the best results were observed on the group II.
Descrição
Palavras-chave
Cavidade dentaria - Preparo, Materiais dentários, Esmalte dentário, Cavity configurations
Como citar
CARVALHO, João Cândido de. Influência da configuração e do bisel em esmalte bovino, nos preparos cavitários de classe v, para restaurações de resina composta compactável: estudo in vitro da infiltração marginal. 2001. 167 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Odontologia de São José dos Campos, 2001.