トルクを付加した際の歯および歯根膜における応力分布の有限要素解析

Kosaku, Kazuhito, Nakajima, Akira, Nishi, Yasukazu, Namura, Yasuhiro, Isshiki, Yoshitomo, Nakamura, Yoshiki, Arai, Yoshinori, Takahashi, Susumu, Tanaka, Eiji, Motoyoshi, Mitsuru

In case of lingual displacement of lateral incisor, we should apply labial root torque after labial tipping movement of lateral incisor. The torque moment generated by third order bend is one of the important keys for orthodontic tooth movement. The objective of this study was to investigate the stress distribution on root surface and in surround periodontal ligament (PDL) when labial root torque is applied to lingually displaced lateral incisor by finite element (FE) analysis. The FE models of maxillary incisors and canine were developed from three-dimensional (3 D) point data sets of CT-image. The models of 0.018” slot sizes stainless steel brackets and 0.018 x 0.025-inch stainless steel (SS) wires were constructed based on 3 D CAD data. As a loading condition, 6 degrees labial root torque moment was applied to the archwire at lateral incisor. The distribution of the von Mises equivalent stresses (equivalent stress) on the root surface and in surrounding PDL of incisors and canine was evaluated using an FE analysis. When applying labial root torque at lateral incisor, greater equivalent stress was observed at the labial cervical margin and root apex. The values of equivalent stresses on the root surface of lateral incisor were less than 11.0 × 10-3 MPa, while the maximum equivalent stress of the neighboring teeth (central incisor and canine) were 4.5 × 10-3 observed at the lingual cervical margin and root apex. These results indicate the neighboring teeth are considerably affected as a reaction force when the torque moment is applied to the targeted tooth.

トルクを付加した際の歯および歯根膜における応力分布の有限要素解析

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