Effect of different reinforcement techniques on fracture resistance of overly flared endodontically treated teeth with extensive coronal tooth structure loss – an in vitro study

Introduction Despite newer technological advances in dentistry in recent years, there still exist major challenges for the restoration of excessively flared endodontically treated teeth with extensive coronal tooth structure loss. The aim of this study is to evaluate and compare the fracture resistance of excessively flared endodontically treated teeth with extensive coronal tooth structure loss with different reinforcement techniques. Method: Standardized MOD cavities were prepared on single rooted premolars followed by root canal preparation. Samples were randomly divided into 3groups(n=10). Group I-Apically snugly fitting Fiber post was luted using Rely X. Group II-Both fiber post and Ribbond were placed in the post space. Group III-Fiber post along with accessory post were luted in the canal. Remaining access cavity was filled with packable composite in increments in all the groups. The specimens were subjected to thermocycling. Universal Testing Machine was used to evaluate the fracture resistance. Statistical analysis of data was done using ANOVA and Bonferroni’s test. Results: Highest mean fracture resistance was recorded in group II followed by group III, and Group I. There was no statistical significant difference between groups. Group II showed 100% favourable fracture pattern. Conclusion: Overly flared structurally compromised teeth restored with combination of fiber post and Ribbond showed higher mean fracture resistance with favourable fracture pattern.