Effect Of Loading Angles On The Fracture Resistance Of Two Non-Metallic Posts and Core Systems

Research Abstract

This study was designed to evaluate the effect of different loading angles on the fracture resistance of two types of non-metallic, fiber reinforced and ceramic posts. Twenty intact upper central incisors were selected, decoronated horizontally and aligned in acrylic blocks then subjected to uniform reduction using lathe cut machine. Zirconium dioxide ceramic post (Cosmopost), glass fiber-reinforced post (Easypost) and composite core were fabricated for each tooth using a specially designed core former to have standardized preparation. Direct wax patterns were fabricated for each tooth then cast in NiCr alloy. The fracture resistance of teeth restored by 2 types of posts was measured under oblique (135 degree) and vertical loading using universal testing machine. For each tested post, the mean fracture load of samples tested at axial loading was significantly higher than that tested at oblique (135-degree) loading. Also for each tested loading angle, the Zirconium dioxide Ceramic post group showed significant higher mean fracture load value compared to Glass fiber-reinforced post group.

Research Keywords

Effect Of Loading Angles On The Fracture Resistance Of Two Non-Metallic Posts and Core Systems