Tanne K, Yoshida S, Kawata T, Sasaki A, Knox J, Jones M L
Department of Orthodontics, Hiroshima University School of Dentistry, Japan.
Br J Orthod. 1998 May;25(2):109-15. doi: 10.1093/ortho/25.2.109.
This study was designed to quantify the magnitude of tooth mobility in adolescents and adults, and to investigate the differences in the biomechanical response of tooth and periodontium to orthodontic forces. The initial displacement of the maxillary central incisor was measured in 50 adolescent and fifty adult patients and the biomechanical properties of the periodontium were examined using the finite element method (FEM) and supporting experimental data. The magnitude of tooth mobility was significantly greater in the adolescent group than in the adult group. By integrating the differences in tooth mobility in both subject groups with analytical tooth displacements, the Young's modulus of the periodontal ligament (PDL) was demonstrated to be greater in the adults than in the adolescent subjects. The differing biomechanical properties of the PDL in adults were demonstrated to result in almost equivalent or somewhat increased stress levels in the PDL in adult subjects. It is suggested that this might produce a reduction in the biological response of the PDL and thus lead to a delay in tooth movement in adults.
本研究旨在量化青少年和成年人牙齿移动的程度，并研究牙齿和牙周组织对正畸力的生物力学反应差异。测量了50例青少年和50例成年患者上颌中切牙的初始位移，并使用有限元方法（FEM）和支持性实验数据研究了牙周组织的生物力学特性。青少年组牙齿移动的程度明显大于成年组。通过将两个受试者组牙齿移动的差异与分析得到的牙齿位移相结合，证明成年组牙周膜（PDL）的杨氏模量大于青少年受试者。结果表明，成年人PDL不同的生物力学特性导致成年受试者PDL中的应力水平几乎相等或有所增加。这可能会导致PDL的生物学反应降低，从而导致成年人牙齿移动延迟。
