Kim Y G, Oh S H
Department of Oral and Maxillofacial Surgery, College of Dentistry, Kyung Hee University, Seoul, Korea.
J Oral Maxillofac Surg. 1997 Feb;55(2):121-6; discussion 126-8. doi: 10.1016/s0278-2391(97)90224-x.
This study investigated the effect of mandibular setback surgery on occlusal force and evaluated the extent to which postsurgical changes in such force can be explained by the type of operation, the duration of maxillo-mandibular fixation (MMF), and the changes in the mechanical advantage of the jaw musculature.
Maximal molar bite force was measured before surgery and at MMF removal, and 3, 6, and 12 months thereafter in 26 patients with mandibular prognothism. To correlate bite force and skeletal change, the cephalometric tracings were measured, tabulated, and statistically analyzed.
Mean bite force was 13.7 kg before surgery, 7.6 kg at MMF removal, 14.2 kg at 3 months, 19.7 kg at 6 months, and 26.1 kg at 12 months post-surgery. The bite force was positively correlated with the surgical change in mandibular plane angle and mandibular body length. The recovery of bite force was significantly affected by the type of operation and duration of MMF.
To hasten recovery and increase bite force after orthognathic surgery, long periods of MMF and injury to the masticatory muscles should be avoided.
本研究调查了下颌后缩手术对咬合力的影响，并评估了手术类型、颌间固定（MMF）持续时间以及颌骨肌肉机械优势的变化在多大程度上可以解释术后咬合力的变化。
对26例下颌前突患者在手术前、去除MMF时以及此后3、6和12个月测量最大磨牙咬合力。为了将咬合力与骨骼变化相关联，对头影测量图进行测量、制表并进行统计分析。
术前平均咬合力为13.7千克，去除MMF时为7.6千克，术后3个月为14.2千克，6个月为19.7千克，12个月为26.1千克。咬合力与下颌平面角和下颌体长的手术变化呈正相关。咬合力的恢复受手术类型和MMF持续时间的显著影响。
为了加快正颌手术后的恢复并增加咬合力，应避免长时间的MMF和咀嚼肌损伤。
