In Vitro Fracture Resistance and Bond Strength of Self-Adhesively Luted Cast Metal and Fiber-Reinforced Composite Posts and Cores: Influence of Ferrule and Storage Time

Abstract

PURPOSE To evaluate the fracture resistance and bond strength of cast posts and cores (CPCs) and customized glass fiber posts (CFPs) with self-adhesive luting. MATERIALS AND METHODS A total of 56 recently extracted premolars were divided into four groups for the fracture resistance test (CPC and CFP, with and without ferrule) and four groups for the bond strength test (CPC and CFP, immediate and 6 months of storage). RESULTS Differences for fracture resistance were found between CPCs and CFPs with ferrule. For bond strength, the interaction between post and root region was significant. CONCLUSION Self-adhesive luting increased fracture resistance of CPCs with ferrule. The ferrule decreased root fractures. Bond strength was similar for both retainers but not for the apical third. Water storage affected bond strength positively.