Document Type

Article

Publication Date

2021

Abstract

This study evaluated the effect of thickness and photo-polymer- ization distance on flexure strength of two bulk fill resin compo- sites. In total, 96 rectangular-shaped resin composite bars were divided into eight experimental groups (n ¼ 12/group) according to the three experimental factors; Factor 1: Material (X-tra fil and Admira Fusion X-tra), Factor 2: Thickness (2 mm and 4 mm) and Factor 3: photo-polymerization distance (2 mm and 8 mm). The bars were prepared with fixed 2 mm width and 2 mm length but differed in thickness (2 mm or 4 mm). The bars were light cured either at 2 mm or 8 mm distances. Flexure strength test was run at a crosshead speed of 0.5mm/min. Data were analyzed using 3- Way ANOVA/Student t-test. Methacrylate-based resin composite exhibited significant higher flexure strength (p < 0.001). At 2 mm distance, there was no significant difference between 2mm and 4 mm thicknesses for X-tra fil and Admira Fusion X-tra (p ¼ 0.726 and p ¼ 0.486, respectively). At 8mm distance, both materials showed significantly higher flexure strength with 4mm thickness compared to 2 mm thickness (p ˂ 0.001). Only X-tra fil with 2 mm thickness had no statistically significant difference on the flexure strength at 2 mm and 8 mm distances (p ¼ 0.437). X-tra fil in 2 mm thickness cured at 8mm distance and Admira Fusion X-tra in 4 mm thickness cured at 2 mm distance revealed the highest reli- ability. Methacrylate-based resin composite tested in this study had superior flexure strength compared to ormocer-based resin composite, regardless of the increment thickness and photo-poly- merization distance.

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