Different post systems on resistance to fracture of flared roots

Objectives:Aim of this study is to evaluate the resistance to fracture of experimentally weakened human roots internally reconstructed with filling materials Super-Bond C&B in combination prefabricated post.methods: Fifty structurally weakened upper central incisors were divided into four groupsand internally prepared to standardized dimensions, simulating weakness. Each “flared” canal were filled with Super-Bond C&B, then immediately restored with four different prefabricated post, ParaPost stainless steel posts, ParaPost titanium posts, glass-fiber posts and cast posts and core. The control group were restored with cast post and core. One-way analysis of variance and a Tukey test were used to determine the significance of the failure lads between groups(p<0.01).Results:Statisticas showed that there were differences between flared canals filled with Super-Bond C&B in resistance to fracture. Teeth restored with ParaPost titanium and cast core and post exhibited significantly higher resistance to fracture (p<0.01)when compared to glass-fiber posts ,but the fracture model of the glass-fiber posts were more favorable to teeth.Conclusion:Among the four kinds of posts evaluated ,titanium and glass-fiber posts could be best indicated.