The Effect of Two Calcium Silicate Materials on the Fracture Strength of Simulated Immature Teeth during Regenerative Endodontic Treatment

BACKGROUND Necrotic immature permanent teeth undergoing Regenerative Endodontic Treatment (RET) are subjected to functional forces that might lead to their fracture before achieving apical closure. This study compared the fracture strength of simulated immature teeth treated with RET that were subjected to cyclic loading. METHODS Thirty human anterior teeth were randomly assigned into three groups (Group I: control, groups II and III: prepared to simulate immature teeth then subjected to RET with EndoSequence Root Repair Material (ESRRM) and white Mineral Trioxide Aggregate (WMTA) used as coronal barriers, respectively). All specimens were mounted on customized mold and subjected to cyclic loading until fracture or to a maximum of 165,000 cycles. The number of endured cycles and the maximum load applied at failure were recorded. Chi-square analysis was done to compare the frequency of fracture while One - Way ANOVA followed by Tukey’s Post Hoc test were done to compare means for the number of endured cycles and the maximum load applied to failure. RESULTS There was no significant difference between the three groups regarding the frequency of fracture (P > 0.05). There was no significant difference between the mean number of cycles endured or force at failure between group I and II or groups II and III (P > 0.05). However, group III endured significantly less force (P= 0.008) and significantly lower number of cycles (P = 0.014) compared to group I. CONCLUSIONS Within the limitation of this study, there was no significant difference between ESRRM and WMTA regarding their reinforcement of teeth treated with RET. KEY WORDS EndoSequence Root Repair Material, Fracture Strength, Immature Teeth, Mineral Trioxide Aggregate, Regeneration