Yoon Young-Jooh, Jang Sung-Ho, Hwang Gab-Woon, Kim Kwang-Won
College of Dentistry, Chosun University, Gwang-Ju, Korea.
Angle Orthod. 2002 Oct;72(5):397-401. doi: 10.1043/0003-3219(2002)072<0397:SDPBCO>2.0.CO;2.
The purpose of this study was to evaluate the stress distribution produced in the dentoalveolar system by a maxillary posterior crossbite appliance used for the correction of maxillary second molars in buccal crossbite. A photoelastic model was fabricated using a photoelastic material (PL-3) to simulate alveolar bone and ivory-colored resin teeth. The model was anteriorly and posteriorly observed with a circular polariscope and photographically recorded before and after activation of the maxillary posterior crossbite appliance. An uncontrolled palatal tipping and a rotating force were generated when the traction force was applied on the palatal surface of the maxillary second molar. A controlled tipping and an intrusive force were generated when the traction force was applied on the buccal surface of the maxillary second molar.
本研究的目的是评估用于矫正上颌第二磨牙颊向反牙合的上颌后牙反牙合矫治器在牙-牙槽系统中产生的应力分布。使用光弹性材料（PL-3）制作光弹性模型，以模拟牙槽骨和象牙色树脂牙。在上颌后牙反牙合矫治器激活前后，用圆偏振光镜对模型进行前后观察并拍照记录。当上颌第二磨牙腭面受到牵引力时，会产生不受控制的腭向倾斜和旋转力。当上颌第二磨牙颊面受到牵引力时，会产生可控的倾斜和压入力。
