Conclusion
fracture
ENDODONTICALLY TREATED TEETH
Based on the findings of this study, we conclude that:
There is no statistically significant difference between fracture resistance of endodontically treated teeth restored with either zirconia post-core or glass fiber post and composite resin core in different post space diameters. Highest was presented in group GW and lowest was exhibited in group ZN.The increase in post diameter increases the fracture resistance of the post itself, however, it greatly affects the fracture resistance of remaining radicular dentin.Modulus of elasticity is a major contributing factor that affects the fracture resistance of endodontically treated teeth and their mode of failure that occurs.Teeth restored with glass fiber posts and composite resin core can be retreated after their favorable failure. On the other hand, teeth restored with custom-made zirconia post-core require extraction later on as their failure extends beyond the cervical line and involves vertical fracture along the length of the root.