Endodontically treated and repaired teeth are often worried about fractures. Endodontic therapy is known to reduce the flexibility of teeth, which in turn reduces their resistance to fracture. During the construction of access cavities and endodontic treatment, it results from the drying of tooth structure and the loss of a significant amount of dentin and significant anatomical components such as cusps, marginal ridges, and the pulp chamber roof. The longevity of teeth that have had endodontic treatment depends on the quantity of dental structure still present and the kind of restorative material used. The procedure utilised to restore the tooth and the interactions that take place between the tooth, the restorative material, and the oral environment. When compared to teeth with indirect restorations, it was discovered that teeth with direct restorations experienced a higher frequency of following treatments, such as non-surgical retreatment, root-end surgery, extraction, and additional restorations. These differences were statistically significant, suggesting that the type of restoration influenced the need for additional treatments. In conclusion, the results of the systematic review indicate that the choice of restoration technique for root-canal-treated teeth has implications for cost-effectiveness, success rates, and longevity. Regarding specific restorations, metal-ceramic crowns performed better in terms of success rates than composite resin restorations, although there was no significant difference in survival.
