INFLUENCES ON STABILITY FOLLOWING ORTHOGNATHIC SURGERY

正畸和外科联合治疗的进步使它成为 有可能纠正或显著改善牙面畸形， 以前无法治疗，继续取得重大进展 以快速的速度发生。虽然正颌外科的长期疗效 手术在大多数情况下是稳定的，治疗后有一些变化 几乎所有患者的形态都是如此，少数患者明显复发。这个 该手术对颌位和口腔体积的影响 需要相当大的生理适应，而且很可能 治疗后形态改变的程度与治疗的程度和 生理适应模式。 在这个项目中，接受外科-正畸治疗的患者通过 将对北卡罗来纳大学的牙面计划进行研究。形态稳定性将是 将在治疗后寻求评估和相关性 头、下颌、舌的形态变化及(1)体位 根据自然头位头影测量片进行评估，(2)嘴唇 用微型口腔内压测量压力和功能 换能器，(3)舌力和唇力的平衡 牙弓，(4)呼吸模式，使用新开发的 鼻腔/口腔气流比测定仪(5) 垂直方向的舌压，以及(6)咬合力 吞咽、咀嚼和最大努力，用压电法进行评估 力传感器。该数据库将用于测试一系列特定的 与临床重要问题相关的假设。该项目应该 提供对软组织功能作为致病因素的洞察力 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.