安氏Ⅱ类错牙合伴颞下颌关节紊乱病患者经RW-splint治疗前后二腹肌前腹肌电的变化

The change of electromyographic activity of digastrics anterior before and after the RW-splint treatment of Angle class Ⅱ malocclusion patients with temporomandibular disorders

目的探讨安氏Ⅱ类错牙合畸形伴颞下颌关节紊乱病(temporomandibular disorders,TMD)患者在经RWsplint治疗1周和2个月后二腹肌前腹肌电活动的改变,为治疗此类患者提供依据。方法 RW-splint戴入成功后,采用Bio PAK系统的EMGⅡ型表面肌电测量仪分别对患者治疗前及RW-splint治疗后1周、2个月的二腹肌前腹肌电活动进行检测。结果 RW-splint治疗1周后患者的二腹肌前腹在吞咽位时肌电幅值差异均无统计学意义(P>0.05);治疗2个月后患者吞咽位时二腹肌前腹的肌电幅值均降低,差异有统计学意义(P<0.05),在下颌姿势位治疗前后差异无统计学意义(P>0.05)。结论 RW-splint必须加长戴用时间才能改变二腹肌前腹的肌电值。

Objective The investigate the change of the electromyographic activity about digastrics anterior after RW-splint treatment for one week and two monthsin order to offer the theoretic basis for class Ⅱ malocclusion deformity patients with temporomandibular disorders（ temporomandibular, disorders, TMD）. Methods After wearing RW-splint successfully, the electromyographic activities of diagastric anterior before and 1 weeks, 2 months after RW-splint treatment were detected by EMG Ⅱ type surface EMG measuring instrument with BioP AK system. Results There was no statistically difference exist（ P 〉0. 05） in the EMG records of digastric anterior muscle during swallowing position after one week＇s RW-splint treatment. After 2 months treatment compared with pre-treatment, EMG records of digastric anterior muscle during swallowing position were decreased respectively, which showed remarkable significance（ P〈 0. 05）. However, after 1 week, 2 months treatment compared with pre-treatment, EMG records of digastric anterior during MMP,which showed no statistically signifcant difference（ P 〉0. 05）. Conclusion Extension time of RW-splint worn can change the electromyographic activity of digastrics anterior.