Zhou Chong Yang, Yang Zhao Hui, Feng Hai Lan
Special Department of Dentistry, Peking University School and Hospital of Stomatology, Beijing, China.
Beijing Da Xue Xue Bao Yi Xue Ban. 2008 Jun 18;40(3):323-6.
To investigate the short-term and long-term effects of occlusal rehabilitation on the co-contractration patterns of masticatory muscles of patients with extensive tooth wear.
Twenty-nine patients with severe tooth wear were selected and conducted with occlusal rehabilitation. The surface electromyography (EMG) of masseter (MM), anterior temporalis (TA) and posterior temporalis (TP) at rest position, during clenching and chewing were separately recorded in the stage of pre-treatment, 1 month after temporary restoration, 1 month after permanent restoration and long-term observation (mean 3.5 years). The Asymmetry Indexes (AI) of bilateral muscles, Activity Indexes of MM/TA, MM/TP and TA/TP were compared in each stage.
(1) After occlusal rehabilitation, all the AIs of bilateral MM, TA and TP at rest position, during clenching and chewing showed obvious decrements. (2) In every stage of occlusal rehabilitation, all of the Activity Indexes of MM/TA at rest position, during clenching and chewing had no obvious changes. (3) The Activity Indexes of MM/TP and TA/TP during clenching and chewing significantly increased after occlusal rehabilitation.
The treatment of occlusal rehabilitation can significantly improve the bilateral symmetry of masticatory muscles in patients with extensive tooth wear, and also change the coordinated EMG activity of different masticatory muscles.
探讨咬合重建对重度牙齿磨损患者咀嚼肌共同收缩模式的短期和长期影响。
选取29例重度牙齿磨损患者进行咬合重建。分别在治疗前、临时修复后1个月、永久修复后1个月及长期观察（平均3.5年）阶段，记录咬肌（MM）、颞肌前束（TA）和颞肌后束（TP）在静息位、紧咬及咀嚼时的表面肌电图（EMG）。比较各阶段双侧肌肉的不对称指数（AI）以及MM/TA、MM/TP和TA/TP的活动指数。
（1）咬合重建后，双侧MM、TA和TP在静息位、紧咬及咀嚼时的AI均明显降低。（2）在咬合重建的各阶段，MM/TA在静息位、紧咬及咀嚼时的活动指数均无明显变化。（3）咬合重建后，MM/TP和TA/TP在紧咬及咀嚼时的活动指数显著增加。
咬合重建治疗可显著改善重度牙齿磨损患者咀嚼肌的双侧对称性，并改变不同咀嚼肌的肌电图协同活动。
