Wang Xiao-Ling, Xu Bao-Hua, Liang Wei, Wang Shu-Yu, Liu Chong
Dental Disease Prevention and Treatment Hospital of Shaoxing, Shaoxing, Zhejiang Province, China.
Shanghai Kou Qiang Yi Xue. 2008 Apr;17(2):175-9.
To analyze the displacement of maxillary first molar on mesial movement by lingual technique with the finite element method,and compare with that by labial technique.
The finite element model was built using the advanced 3-dimensional laser scanning, comprising a maxillary first molar, periodontal ligament, alveolar bone, and a lingual or buccal tube. Different kinds of loads were applied at a point of the lingual or buccal tube separately. By finite element method,the displacement of maxillary first molar was calculated and analyzed.
When the mesial force was applied to the maxillary first molar,the tooth was tipped mesially, rotated distally and lingually by lingual technique. By the labial technique,the tooth was tipped mesially, rotated distally and buccally. The degree of tipping and rotation by labial technique was bigger than that by lingual technique. By labial technique, Mt/F=8.1:1,Mr/F=8:1. By lingual technique, Mt/F=6.9:1,Mr/F=7.1:1. When the tooth moved bodily,the displacement of lingual technique was larger than that by labial technique.
When the maxillary first molar moved bodily toward mesial direction, lingual orthodontics is more efficient than labial orthodontics.
采用有限元方法分析舌侧技术推上颌第一磨牙近中移动时牙齿的位移情况，并与唇侧技术进行比较。
利用先进的三维激光扫描技术建立有限元模型，该模型包括上颌第一磨牙、牙周膜、牙槽骨以及舌侧或颊侧矫治管。分别在舌侧或颊侧矫治管的一点施加不同类型的载荷。通过有限元方法计算并分析上颌第一磨牙的位移。
当上颌第一磨牙受到近中向力时，采用舌侧技术牙齿近中倾斜、远中舌向旋转；采用唇侧技术牙齿近中倾斜、远中颊向旋转。唇侧技术的倾斜和旋转程度大于舌侧技术。唇侧技术中，Mt/F = 8.1:1，Mr/F = 8:1；舌侧技术中，Mt/F = 6.9:1，Mr/F = 7.1:1。当牙齿整体移动时，舌侧技术的位移大于唇侧技术。
当上颌第一磨牙向近中方向整体移动时，舌侧正畸比唇侧正畸更有效。
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