INFLUENCES ON STABILITY FOLLOWING ORTHOGNATHIC SURGERY

现在，下颂外科手术可以矫正牙齿和 以前无法治疗的面部畸形 目标 的目的是评估其形态学，临床， 技术和生理反应因素， 稳定性的结果，从这个矫正正畸治疗。 利用现有的计算机数据库信息从第一 本项目的各个阶段沿着来自新患者的数据，我们将 测试特定的假设，以探索 原发性牙颌面畸形及临床治疗 生理适应和形态稳定的程序 治疗后。 在本项目期间，重点将放在 记录长期（5年）稳定性或形态学变化; 进一步探讨了生理学与 唇压、鼻阻力和呼吸模式的变量， 形态稳定性或复发倾向;相关性试验 模式与形态稳定性或复发倾向之间的关系; 临床变量之间的相关性检验（方向和 颌运动的幅度、移植物材料、切口类型等） 和形态稳定性;澄清各种 正颌外科手术对颌骨功能的影响， 颞下颌关节适应性与咬合力 强度和方向;评价刚性固定的效果 短期和长期使用螺钉和/或小接骨板 稳定性;并测试假设， （颏成形术）通过下缘截骨术显著改变了 舌和唇压力在下切牙之间的平衡 从而改变这些牙齿的稳定位置。 研究 这种类型，以澄清生理适应和形态 手术后稳定性对改善未来很重要 治疗 这些数据还可以更好地了解 面部畸形问题的病因， 人类变化的影响。

Orthognathic surgery now makes it possible to correct dental and facial deformities that previously could not be treated. The goal of this continuing project is to evaluate the morphologic, clinical, technical and physiologic response factors that determine stability of results from this surgical-orthodontic treatment. Utilizing existing computer data base information from the first phases of this project along with data from new patients, we will test specific hypotheses to explore the relationships of the patient's original dentofacial deformity and clinical treatment procedures to physiologic adaptation and morphologic stability followng treatment. In the present project period, emphasis will be placed on documenting long term (5 year) stability or morphologic changes; further exploration of the relationship between the physiologic variables of lip pressure, nasal resistance and respiratory mode to morphologic stability or relapse tendencies; tests of association between mode to morphologic stability or relapse tendencies; tests of association between clinical variables (direction and nagnitude of jaw movement, graft material, type of incision, etc.) and morphologic stability; clarifying the effects of various orthognathic surgery procedures on jaw function and indicated by temporomandibular joint adaptation and by occlusal force magnitude and direction; evaluating the effects of rigid fixation with screws and/or small bone plates on short and long term stability; and testing the hypothesis that relocating the chin (genioplasty) via lower border osteotomy significantly alters the balance between tongue and lip pressures across the lower incisors and thereby changes the stable position of these teeth. Research of this type to clarify physiologic adaptation and morphologic stability following surgery is important to improve furture treatment. The data also can provide a better understanding of the etiology of facial deformity problems by illustrating the effect of changes in humans.