INFLUENCES ON STABILITY FOLLOWING ORTHOGNATHIC SURGERY

正畸和外科联合治疗的进步使其成为 可以矫正或显著改善牙面畸形， 以前无法治疗的疾病，继续取得重大进展， 发生在一个快速的速度。 虽然正颌外科的长期效果 手术在大多数情况下是稳定的，但有一些治疗后的变化 在几乎所有患者中，形态学上都有变化，少数患者出现明显复发。 的 这种手术造成的下颌位置和口腔体积的改变 需要相当大的生理适应，而且很可能 治疗后形态学变化的程度与 生理适应模式。 在这个项目中，接受正畸治疗的患者， 将研究口腔颌面外科方案。 形态稳定性将 评价并寻求治疗后 形态学变化和（1）头、下颌骨和舌的姿势， 根据自然头位X线头影测量片评价，（2）唇 压力和功能，用微型口内压测量 （3）舌唇力在下牙槽嵴上的平衡 牙弓，（4）呼吸模式，使用新开发的 用于测量鼻/口气流比的SNORT装置（5） 垂直方向的舌压力，和（6）咬合力， 吞咽，咀嚼和最大努力，如使用压电 力传感器 该数据库将用于测试一系列具体的 与临床重要问题相关的假设。 该项目应 提供了对软组织功能作为病因学因素的深入了解， 牙面畸形以及治疗后稳定性的决定因素。

Advances in combined orthodontic and surgical treatment have made it possible to correct or significantly improve dentofacial deformities which could not be treated previously, with significant progress continuing to occur at a rapid rate. Although the long-term results of orthognathic surgery are stable in most instances, there are some post-treatment changes in morphology in almost all patients and significant relapse in a few. The alterations in jaw position and oral cavity volume produced by this surgery require considerable physiologic adaptation, and it is likely that the extent of post-treatment morphologic change is related to the extent and pattern of physiologic adaptation. In this project, patients undergoing surgical-orthodontic treatment through the UNC Dentofacial Program will be studied. Morphologic stability will be evaluated and correlations will be sought between post-treatment morphologic changes and (1) posture of the head, mandible and tongue as evaluated from natural head position cephalometric radiographs, (2) lip pressures and function, measured with miniature intra-oral pressure transducers, (3) the balance of tongue and lip forces across the lower dental arch, (4) respiratory mode, as evaluated using the newly-developed SNORT apparatus for measurement of nasal/oral airflow ratios, (5) vertically directed tongue pressures, and (6) occlusal forces during swallowing, chewing and maximum effort, as evaluated using piezo-electric force transducers. The data base will be used to test a series of specific hypotheses related to clinically important questions. The project should provide insight into soft tissue function as a factor in the etiology of dentofacial deformity as well as a determinant of post-treatment stability.