Evaluation of depth of cure and Knoop hardness in a dental composite photo-activated using different methods

Brazilian Dental Journal

Andresa Carla Obici¹  Mário Alexandre Coelho Sinhoreti¹  Lourenço Correr Sobrinho¹  Mario Fernando De Goes¹  Simonides Consani¹ 

[1] ,UNICAMP School of Dentistry of Piracicaba Piracicaba SP ,Brazil

关键词: photo-activation methods;    composite resin;    depth of cure;    Knoop hardness;    dental materials;   

DOI  :  10.1590/S0103-64402004000300007

来源: SciELO

【 摘 要 】

The aim of this study was to evaluate the depth of cure and Knoop hardness in the P60 composite resin photo-activated using different methods. A bipartite brass matrix (3 mm in diameter X 11 mm in height) was filled with the composite and photo-activation was performed using continuous light, exponential light, intermittent light, plasma arc curing (PAC) or light-emitting diodes (LED). After opening the matrix, the uncured material was removed with a steel spatula and the polymerized composite was measured using a pachymeter. The specimens were then included in self-curing acrylic resin and worn longitudinally and the hardness was measured on the surface and at depths of 1, 2, 3, 4 and 5 mm. The data were analyzed by ANOVA and Tukey's test (5%). The results showed that the depth of cure was higher with the intermittent light, followed by continuous light, exponential light, PAC and LED methods. Up to a depth of 2 mm, all methods revealed similar hardness values, but there were differences between them at other depths, at which LED demonstrated the lowest values followed by PAC.

【 授权许可】

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