查看文章

Objective:

The aim of this study was to evaluate the degree of conversion and hardness of different composite resins, photo-activated for 40 s with two different light guide tips, fiber optic and polymer.

Methods:

Five specimens were made for each group evaluated. The percentage of unreacted carbon double bonds (% C═ C) was determined from the ratio of absorbance intensities of aliphatic C═ C (peak at 1637 cm− 1) against internal standard before and after curing of the specimen: aromatic CC (peak at 1610 cm− 1). The Vickers hardness measurements were performed in a universal testing machine. A 50 gf load was used and the indenter with a dwell time of 30 seconds. The degree of conversion and hardness mean values were analyzed separately by ANOVA and Tukey’s test, with a significance level set at 5%.

Results:

The mean values of degree of conversion for the polymer and fiber optic light guide tip were …