歯列模型および頭部X 線規格写真から構築した 新しい三次元デジタルモデルシステムと臨床評価.

This study aimed to establish three-dimensional digital model new system from dental cast models and head films and verify the accuracy of the system to assess three-dimensional bone and tooth movement using a reconstructed bone-tooth integrated model, in cases treated by maxillary protractive new appliance. 12 patients (8 female and 4 male children), aged 6 years and 10 months on average (4 years and 10 months to 9 years and 11 months), with anterior cross bite due to skeletal factors participated in this study. They were treated by maxillary protractive new appliance. At an initial and the end of treatment recording, the upper teeth were reconstructed with digital models of the upper casts from the 3D Scanner STL data, the virtual skull were reconstructed with head films. The teeth area of the virtual skull models were replaced with the corresponding teeth of the digital models. Consequently the bone-teeth integrated models were reconstructed. As a result, bone and tooth movement was analyzed three-dimensionally. For the translation of the point A, anterior movement of the maxillary complex was 4.5mm on average on the global coordinate system. The rotation of the occlusal plane was 5.0°on average on the global coordinate system. Through reconstructing a bone-teeth integrated model, a three-dimensional digital model new system for analyzing bone and teeth movement was established. It was demonstrated that the maxillary protractive new appliance acts on the bone and effects in improving skeletal disharmony. The efficacy of the clinical application was suggested. [ABSTRACT FROM AUTHOR]