Establishment of a new method of orthodontic tooth movement based on the 3-D individual structural character of the tooth, periodontal ligament, and alveolar bone

这项科学研究的目的（C）是为了获得实现正畸治疗的基本数据。首先，我们利用CT获得了两个干颅骨的0.2mm连续切片数据。然后使用三维重建软件根据这些切片数据重建三维模型。在这个过程中，牙齿，牙周膜，牙槽骨，和窦从数据中分离。同时，我们也可以从正畸患者的CT数据中重建三维模型。这些三维模型可用于三维力学分析，如有限元模型分析。并且它可以建议从这些三维模型的力学分析产生定制的正畸治疗。另一方面，开发了一种用于评估患者唇密封的新装置。在计算、听音乐、睡觉等多种状态下，可以检测出患者自身的唇形密封率。当听音乐时，低密封唇比率的受试者在其他两种条件下通常具有较低的密封唇比率。在计算和听力时具有高闭唇比率的受试者在睡眠时表现出更长的闭唇时间的趋势。这一结果也表明了实现个性化正畸治疗（定制）的可能性。

The aim of this scientific research (C) was to get the basic data for achieving orthodontic treatment made to order. At first we got the 0.2mm serial slice data of two dry-skull by using computed tomography (CT). Then we reconstructed the 3-d models from these slice data by using the 3-d re-construction software. In this procedure, tooth, periodontal ligament, alveolar bone, and sinus were isolated from the data. And we also could reconstruct the 3-d model form the CT data from the orthodontic patient individually. It is suggests that these 3-d model would be useful for the 3-d analysis of the mechanics such as finite elements model analysis. And it could suggest that the mechanical analysis from these 3-d model produce the orthodontic treatment made to order. On the other hand, a new device for evaluating lip sealing of the patients was developed. We could detect the lip sealing ratio of the patients own at many conditions such as performing calculation, listening to music, and sleeping. Subjects with low sealed lip ratios when listening to music generally had lower sealed lip ratios under the two other conditions. Subjects who had high sealed lip ratios while calculating and listening showed a tendency towards longer sealed lip times while sleeping. This results also suggests the possibility to achieve the individual orthodontic treatment (made to order).