抄録
A porcine mandible was separated to prepare thin wet periodontium specimen consisting of a retromolar, periodontal ligament, and alveolar bone. Occlusion test was simulated by applying a forced compressive displacement using a tabletop material tester. We photographed the images of the displacing periodontium specimen and obtained the load-displacement curve during the test. The displacement and deformation distributions were visualized by a digital image correlation analysis. Then, we correlated the distributions with the load-displacement curve, which characterized by biphasic behavior in many previous studies. Additionally, to clarify the potential of dried periodontium specimens as the occlusion specimens, similar experiments using well dried periodontium specimens were conducted to compare the distribution and the load-displacement curve to the wet ones. The results were as follows. (1) We succeeded that the displacement and deformation distributions were correlated with the load-displacement curve for the first time. (2) In the biphasic behavior of the load-displacement curve, we experimentally revealed that the first phase indicates the deformation of the periodontal ligament, and the second one indicates the deformations of the alveolar bone and retromolar. (3) A significant difference was observed in the displacement and deformation distributions and the load-displacement curves between the wet and dried periodontia specimens.
