Influence of different post-core systems on impact stress: a pilot study

This pilot study compared impact strain at the core and root surfaces between two different post-core systems. The form of a bovine mandibular front tooth was modified to resemble that of a human maxillary incisor as a test specimen. A cast post and core (Metal PC) and composite resin and glass fiber-reinforced epoxy resin post (Fiber-Resin PC) system were tested. Four gauges were affixed to the buccal and lingual surfaces of the core and root. The specimens were then embedded in a metal mold using dental stone. A pendulum-type device with a pyramid-shaped metal impact object with a titanium alloy head was used to provide 2 different shock forces. Maximum distortion was measured and analyzed. Distortion at the core at each measurement point and total amount of distortion with Fiber-Resin PC was significantly greater (p