Stress in Immature Incisor Treated With Regenerative Endodontics or Restored With Bulk-Fill Resin Composite: A 2D Finite Element Analysis.

This study investigated the stress distribution on teeth undergoing regenerative endodontic treatment (RET) using two-dimensional finite element analysis (2D FEA). Five 2D-FEA models of immature incisors were developed, involving immediately after RET, models after RET varying root length and thickness: 10% increase in root length and root thickness; 10% increase in root length and 20% increase in root dentin thickness; 10% increase in root length and 40% increase in root dentin thickness; and a model after MTA apexification reinforced with resin composite. A biting load of 100 N was applied, and modified von Mises stress was analysed. Increasing root dentin thickness after RET provides limited benefit in the stress distribution, mainly by reducing the stress-to-area ratio in dentin. MTA apexification followed by resin composite restoration decreased intraradicular stress at the cervical region compared to RET. The combination of root dentin formation followed by filling with bulk-fill resin composite reduced root dentin stress.