Evaluation of Microleakage and Microtensile Bond Strength of Two Bulk Fill Composites in Primary Teeth after Caries Removal by Chemomechanical Technique

Abstract

Introduction: Evaluation of Microleakage and Microtensile Bond Strength of Two Bulk Fill Composites in Primary Teeth after Caries Removal by Chemomechanical Technique. Aim: to evaluate microleakage as well as microtensile bond strength of two bulk fill composites (X-tra fill packable and X-tra base flowable bulk fill composites) in primary teeth after chemomechanical caries removal. Material and methods: forty extracted human carious primary posterior teeth without pulp exposure were assigned after caries removal by Papacarié into two groups based on restorative material used, each containing 20 teeth. Group 1: was restored with X-tra fill. Group 2: was restored with X-tra base. In two groups Futurabond dual-curing self-etch bond was used to bond restorations to the dentin. The two groups were subdivided into 2 subgroups: Subgroup A: 10 teeth used for microleakage test. Subgroup B: 10 teeth used for microtensile bond strength test. For microleakage test: After thermocycling; teeth were covered with varnish then immersed in 2% methylene blue for 24 h., thereafter the dye penetration was assessed with measured in micrometer using MA100 fully configured Halogen inverted scope. For microtensile test: The specimens were sectioned longitudinally to the tooth long axis for obtaining sticks of standardized cross sectional region. Such sticks were stressed to failure using tensile force in a universal testing machine. The µTBs for each sample was calculated in megapascal. Results: X-tra Fill showed lower insignificant mean microleakage compared to X-tra Base at P value =0.3. X-tra Fill showed higher insignificant mean µTBs (MPa) compared to X-tra Base at P value =0.097. Conclusion: Both bulk fill composites have performed approximately similar regarding microleakage and µTBs after using Papacarie for caries removal.