摘要
应用激光全息干涉计量术的二次曝光技术,对一具恒牙列早期女性尸体颅骨在模拟临床牵引上颌矫治的情况下加力300g向前牵引,测定上颌复合体受与(牙合)平面呈不同角度前牵引力时的微小三维位移场,为临床前牵引上颌提供生物力学依据。实验结果表明,上颌牙列受(牙合)平面方向及(牙合)平面上15°前牵引力时,上颌复合体逆时针转,上颌向前上移位,受(牙合)平面下15°前牵引力时,上颌复合体主要呈向前下的运动趋势,颌骨前份的上下之间发生挤压弯曲。牵引力方向不同,颅面骨的位移及旋转中心亦异。大小相同,方向不同的牵引力可以引起不同程度的颌面位移。
The laser holographic interferometry was employed to determine the 3-D minute dis-placement of the maxillary complex of a macerated girl skull with early permanent den-tition.It was pulled forward by a 300gm load at different angle to the occlusal planeas being used in the clinic.These results of biomechanical effects may be presented to the clinicians as guidelines.The results demonstrate that when the maxillary dentition is pulled forward alongthe occlusal plane and obliquely 15°above it,the maxillary is rotated counterclock wiseand the maxilla is moved forward and upward;while the maxillary dentition is pulled15°below the occlusal plane,there is the tendency to move the maxillary complex forw-ard and downward and to result a pressed bending between the upper and lower parts ofthe anterior maxilla.The direction of the protraction is the cause of changing the position of the rotationcenter and the exhibited displacement of the craniofacial complex.The same pulling forcewith different direction may cause different extent of craniofacial displacement.
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
1991年第2期89-93,共5页
West China Journal of Stomatology
