Influence of Bioactive and Resin-Based Sealers on the Fracture Strength of Instrumented Teeth: An In Vitro Study

Abstract

The preservation of structural integrity in endodontically treated teeth is a critical factor in ensuring long-term clinical success. This in vitro study aimed to evaluate the influence of bioactive and resin-based sealers on the fracture strength of instrumented teeth. A total of forty extracted human premolars were decoronated and prepared using rotary instrumentation. The specimens were divided into three groups: Group I (control, unobturated), Group II (obturated with bioactive sealer), and Group III (obturated with resin-based sealer). Following obturation, all samples were stored under simulated oral conditions and subjected to compressive loading in a universal testing machine until fracture occurred. The results indicated that both sealer types enhanced fracture resistance compared to the control group, with the bioactive sealer group demonstrating the highest mean fracture strength. The findings suggest that bioactive sealers, due to their chemical bonding and biomineralization potential, provide superior reinforcement to root dentin compared to resin-based sealers. These outcomes highlight the clinical relevance of selecting bioactive materials to improve the durability and longevity of endodontically treated teeth.