Avaliação da dureza superficial de cimentos resinosos após cimentação de pinos de fibra de vidro: efeito de profundidade de polimerização e sistemas adesivos
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Data
2004-04-06
Autores
Jardim, Patrícia dos Santos [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Os pinos pré-fabricados de fibra de vidro têm sido o sistema de escolha para reconstrução de dentes anteriores tratados endodonticamente e o sucesso da cimentação dos pinos de fibra de vidro está associado à cimentação do tipo adesiva, sendo que o agente cimente normalmente utilizado é um cimento resinoso de dupla polimerização, entretanto questiona-se a eficácia dos cimentos de dupla polimerização, principalmente nas regiões muito distantes da fonte de luz, bem como sua compatibilidade química com sistemas adesivos simplificados. O presente trabalho teve como objetivo avaliar a dureza superficial de cimentos resinosos, um quimicamente ativado (Bistite II DC) e um de dupla polimerização (Rely X) em função de diferentes profundidades de polimerização e sistemas adesivos; bem como, formação de camada híbrida quando da cimentação de pino de fibra de vidro no canal radicular de dentes bovinos. Foram utilizados 40 raízes bovinas, as quais foram tratadas endodonticamente e divididas aleatoriamente em 4 grupos de 10 raízes cada de acordo com o cimento resinoso e sistema adesivo utilizado para cimentação do pino de fibra de fivro: (GI) Bistite II DC; (GII) Rely X associado ao Scotchbond Multi-Uso Plus; (GIII) Rely X associado ao Single Bond; (GIV) Rely X associado ao One-Up Bond F. Após 24 horas da cimentação, as raízes foram seccionadas no sentido transversal em três discos radiculares, representando os terços cervical, médio e radicular, com profundidades respectivas de 3,0mm; 6,0mm e 9,0mm. Para realização das medidas de dureza, cada secção radicular foi dividida em quadrantes, nos quais foram realizadas três medidas: (M1) próximo à dentina radicular; (M2) região intermediária; (M3), próximo ao pino de fibra de vidro, cujos resultados foram submetidos à Análise de Variância e Teste de Tukey. Após o Ensaio de Dureza, as amostras foram... .
Fiber posts have been the system of choice for endodontically-treated anterior teeth reconstruction, and the cementation luting success is associated to adhesive-type cementation, being the dual-cure resin cements the most utilized cement. However, the dual-cured cements efficacy is questioned, mainly in the regions distant from the light-cure source, as well as the chemical compatibility to simplified adhesive systems. The aim of the present study was evaluate superficial roughness of resin cements, being one of them chemically activated (Bistite II DC) and the other dual-cured resin cement (Rely X) under different light-cure depths and bond systems; as well as hybrid layer formation in cases of glass fiber post in bovine radicular canal. Forty bovine roots samples were used. These roots were endodontically treated and randomly separated in four groups of 10 roots each according to the resin cement and adhesive system used for glass fiber post cementation.: The groups were divided as follows: (GI) Bistite II DC; (GII) Rely X associated to Scotchbond Multi-Purpose Plus; (GIII) Rely X associated to Single Bond; (GIV) Rely X associated to One-Up Bond F. After 24 hours passed from cementation, roots were sectioned in transversal orientation in three radicular discs, representing the cervical, medium and radicular thirds, with respective depths of 3,0mm; 6,0mm e 9,0mm. For hardness measuring, each radicular section was divided in quadrants. These quadrants were measured three times: (M1) near radicular dentin; (M2) intermediary region; (M3), near glass fiber post. These results were submitted to ANOVA and Tukey Test. After hardness assay samples were submitted to hybrid layer evaluation in Scanning Electron Microscopy and subsequent photomicrography descriptive analysis. From the methodology and... (Complete abstract, click electronic address below).
Fiber posts have been the system of choice for endodontically-treated anterior teeth reconstruction, and the cementation luting success is associated to adhesive-type cementation, being the dual-cure resin cements the most utilized cement. However, the dual-cured cements efficacy is questioned, mainly in the regions distant from the light-cure source, as well as the chemical compatibility to simplified adhesive systems. The aim of the present study was evaluate superficial roughness of resin cements, being one of them chemically activated (Bistite II DC) and the other dual-cured resin cement (Rely X) under different light-cure depths and bond systems; as well as hybrid layer formation in cases of glass fiber post in bovine radicular canal. Forty bovine roots samples were used. These roots were endodontically treated and randomly separated in four groups of 10 roots each according to the resin cement and adhesive system used for glass fiber post cementation.: The groups were divided as follows: (GI) Bistite II DC; (GII) Rely X associated to Scotchbond Multi-Purpose Plus; (GIII) Rely X associated to Single Bond; (GIV) Rely X associated to One-Up Bond F. After 24 hours passed from cementation, roots were sectioned in transversal orientation in three radicular discs, representing the cervical, medium and radicular thirds, with respective depths of 3,0mm; 6,0mm e 9,0mm. For hardness measuring, each radicular section was divided in quadrants. These quadrants were measured three times: (M1) near radicular dentin; (M2) intermediary region; (M3), near glass fiber post. These results were submitted to ANOVA and Tukey Test. After hardness assay samples were submitted to hybrid layer evaluation in Scanning Electron Microscopy and subsequent photomicrography descriptive analysis. From the methodology and... (Complete abstract, click electronic address below).
Descrição
Palavras-chave
Cimentos de resina, Dureza, Fiber post, Resin cement, Adhesive systems, Superficial hardness
Como citar
JARDIM, Patrícia dos Santos. Avaliação da dureza superficial de cimentos resinosos após cimentação de pinos de fibra de vidro: efeito de profundidade de polimerização e sistemas adesivos. 2004. 155 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Odontologia de Araraquara, 2004.