CBCT画像を用いた3次元歯列弓の定義

抄録

Although the teeth are arranged three-dimensionally (3D) in the oral, generally the dental arch is determined in 2D. However, 3D information is needed in computer aided diagnosis, in designing customized implants and in planning orthodontics procedures. Therefore, this study aimed at a method of expressing the dental arch three dimensionally. The 3D models of maxillary and mandibular jaws were constructed from CBCT images of five adults. A 3D world coordinate system in the oral was developed from three feature points of the jaw models. Then, 3D tooth surface models of all the teeth except the third molar were constructed and determined the center of gravity (COG) of each model. The COGs of the all teeth were projected on X-Y(axial), X-Z(coronal) and Y-Z(sagittal) planes of the 3D world coordinate system. The projected COGs of each maxillary and mandibular teeth were regressed as Quadratic to Seventh-order function in each plane. Then the regressed curves were examined using residual sum of squares (RSS) and with aesthetic point of view.