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目的:探讨恒牙期安氏Ⅰ类错低角垂直骨面型患者肌电特点,为正畸临床提供参考。方法:随机选取恒牙期安氏Ⅰ类错患者共64例(低角28例、均角36例),拍摄X线头颅侧位定位片,应用Winceph 8.0软件进行头影测量分析,利用表面电极,采集肌电图信号,比较各组不同状态下咬肌、二腹肌前腹肌电特点。结果:(1)二腹肌前腹在下颌姿势位、牙尖交错位最大紧咬(空咬)以及紧咬树脂垫(高度2 mm)、小开颌、最大开口位及吞咽运动状态下,低角组肌电峰值均大于均角组,有统计学意义(P<0.05)。(2)咬肌咀嚼运动时,低角组在闭口相、咬合接触相以及食物粉碎相肌电峰值均大于对照组,有统计学意义(P<0.05),开口相、食物保持相、牙尖交错位,低角组咬肌肌电峰值有大于对照组的趋势,但无统计学意义。(3)咬肌咀嚼运动时,低角组在开口相、食物保持相、牙尖交错位咀嚼周期时程小于对照组(P<0.05)。闭口相、咬合接触相以及食物粉碎相时程差异均无统计学意义。结论:恒牙期安氏Ⅰ类错低角垂直骨面型患者在二腹肌前腹、咬肌的肌肉电生理上存在差异。
Objective: To investigate the myoelectric characteristics of Class Ⅰ malocclusion in patients with permanent low angle orthognathic bone type, and to provide reference for clinical orthodontics. Methods: A total of 64 patients with Angle Ⅰ class Ⅰ malocclusion in permanent dentition were randomly selected (28 in low angle and 36 in average angle). The cephalometric images of X - ray were taken. The cephalometric analysis was performed with Winceph 8.0 software. Electrodes, collecting EMG signals, comparing different groups of masseter muscle, abdominal anterior abdominal electrical characteristics. Results: (1) In the mandibular posture, maxillary bite of cleft cusp (empty bite) and clenching of resin pad (height 2 mm), small jaw opening, maximal open mouth and swallowing movement, The peak value of EMG in the low-angle group was larger than that in the mean angle group, with statistical significance (P <0.05). (2) When the masseter muscle was chewed, the peak value of the low angle group was higher in the closed phase, the occlusal contact phase and the shattering phase of the food than the control group (P <0.05). The open phase, the food phase and the cusp Interleaved position, low-angle group of masseter muscle EMG peak greater than the trend of the control group, but no statistically significant. (3) When the masseter was chewing, the duration of chewing period in the low-angle group was smaller than that in the control group (P <0.05). There was no significant difference in the duration of occlusion phase, occlusal contact phase and food crushing phase. Conclusion: There are differences in the electrophysiology between the muscles of the anterior abdominal and masseter muscles of Angle Ⅰ Class Ⅰ malocclusion in vertical dentition.