IADR Abstract Archives
Shrinkage Stress and Volumetric Shrinkage of Flowable Bulk Fill Composites
Objectives: The purpose of this study is to compare shrinkage stress (SS) and volumetric shrinkage (VS) of 4 flowable bulk fill composites.
Methods: An ADA tensometer was used to measure SS of composite specimen (n=5), which was placed between two quartz rods. The quartz rods were coated with OptiBond Universal adhesive and light cured. Composite resin was placed between the two rods with a gap of 2 mm and cured for 10 s using a Demi Plus light. The generated force was continuously recorded for 2 min after photoinitiation. For VS, dry and hydrostatic weight of composite specimen before and after polymerization was measured, and VS was calculated using the buoyancy method according to reported mathematical equations. Three samples were measured for each test, and the average and standard deviation are reported. Statistical analysis was conducted using One-way ANOVA and Tukey’s method for pair-wise comparison to determine significant differences among groups (α=0.05).
Results: The results are summarized in the following Table. Within each row, the same letter indicates that there is no statistical difference between values at α=0.05.
Conclusions: SimpliShade Bulk Fill Flow achieves low SS and low VS, which are critical properties for flowable bulk fill composites.
Methods: An ADA tensometer was used to measure SS of composite specimen (n=5), which was placed between two quartz rods. The quartz rods were coated with OptiBond Universal adhesive and light cured. Composite resin was placed between the two rods with a gap of 2 mm and cured for 10 s using a Demi Plus light. The generated force was continuously recorded for 2 min after photoinitiation. For VS, dry and hydrostatic weight of composite specimen before and after polymerization was measured, and VS was calculated using the buoyancy method according to reported mathematical equations. Three samples were measured for each test, and the average and standard deviation are reported. Statistical analysis was conducted using One-way ANOVA and Tukey’s method for pair-wise comparison to determine significant differences among groups (α=0.05).
Results: The results are summarized in the following Table. Within each row, the same letter indicates that there is no statistical difference between values at α=0.05.
Conclusions: SimpliShade Bulk Fill Flow achieves low SS and low VS, which are critical properties for flowable bulk fill composites.