The biomechanical role of periodontal ligament in bonded and replanted vertically fractured teeth under cyclic biting forces

Abstract

The success of replanting vertically fractured teeth depends on crown restoration and healthy periodontal tissues. Using 40 upper first premolar teeth that had been extracted from adolescents for orthodontic reasons, a team led by Wen-Mei Wang from Nanjing University Medical School, China, split each tooth in two, creating vertical fractures. The researchers rejoined the halves with a bonding resin and applied metal crowns to half the teeth. To simulate the two kinds of replantation that can occur, they either attached a layer of silicone rubber to mimic periodontal ligaments or attached epoxy resin as a stand-in for bone. The researchers then applied cyclic forces to reproduce the repeated stress of chewing and found that crown restoration and repaired periodontal fibers are both important for the long-term health of vertically fractured teeth.

Keywords

ankylosis / fatigue test / periodontal ligament healing / replantation / vertically fractured teeth

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