Simplified stress analysis on the temporomandibular joint in Class III patients with and without mandibular asymmetry using a rigid body spring model
スポンサーリンク
概要
- 論文の詳細を見る
To cite this article: Ueki K, Takeuchi N, Nakagawa K, Yamamoto E: Simplified stress analysis on the temporomandibular joint in Class III patients with and without mandibular asymmetry using a rigid body spring model Orthod Craniofac Res 2009;12:312-318 Structured AbstractAuthors - Ueki K, Takeuchi N, Nakagawa K, Yamamoto E Objective - Aim of this study was to investigate the differences in stress on the temporomandibular joint (TMJ) between Class III patients with and without mandibular asymmetry using a rigid body spring model (RBSM). Design - Menton (Me), the centre point of occlusal force on the line that connected the bilateral buccal cusps of the second molars and the most lateral, superior and medial points of the condyle were plotted on frontal cephalograms, and stress on the condyles was calculated with the 2-dimensional RBSM program of fortran. Setting and Sample Population - Eighty Japanese patients with diagnosed mandibular prognathism were divided into two groups, a symmetry group and asymmetry group on the basis of the Mx-Md midline position. Outcome measure - The degree (force partition) of the resultant force, the direction (angulation) and displacement (X, Y) of each condyle were calculated. The horizontal displacement vector (u), the vertical displacement vector (v) and rotation angle (θ) of the mandibular body at Menton were also calculated. Results - There were significant differences between the deviated and non-deviated sides of both groups regarding resultant force (symmetry group: p = 0.0372, asymmetry group: p = 0.0054), X (symmetry group: p < 0.0001, asymmetry group: p = 0.0001) and Y (symmetry group: p = 0.0354, asymmetry group: p = 0.0043). For angulation, there was a significant difference between the deviated and non-deviated sides in the asymmetry group (p = 0.0095). Conclusion - The results of this study suggest that difference in stress angulation on the condyles could be associated with asymmetry in mandibular prognathism. © 2009 John Wiley & Sons A/S.
論文 | ランダム
- キャリア・個人誌・私化--シンボリック相互作用論を中心として
- 多元的現実と社会的世界論
- Insulin secretion and glucose utilization are impaired under general anesthesia with sevoflurane as well as isoflurane in a concentration-independent manner
- 病院管理と血液銀行
- Lewis Acid Mediated Intermolecular Vinylsilylation of Alkynes