CAJ | 학술논문

目的：以咬肌（Masseter muscle ，MM ）为对照，研究牙尖交错位最大紧咬过程中咬合力和胸锁乳突肌（Sternocleidomastoid muscle ，SCM ）肌电之间的关系。方法：采用 T‐scanIII 咬合记录仪和 BioEMG III 肌电图仪，同步记录25名健康受试者 SCM 和 MM 的肌电值，分析不同咬合力水平下肌电值与自主最大紧咬（Maximal voluntary clenching ，MVC）时肌电值的比值的变化。结果：M VC 时，咬合力、SCM 及 MM 肌电值双侧之间无明显差异，SCM 肌电幅值约为 MM 的（9．13±4．77）％～（10．23±6．47）％，SCM 及 MM 的肌电比值在达到最大咬合力的75％之前均呈逐渐增高趋势，但从该水平至 MVC 时均显著下降（P＜ 0．05）。结论：在自主最大紧咬过程中 SCM 表现出与 MM 同步的先升高后降低的肌电变化规律。
목적：이교기（Masseter muscle ，MM ）위대조，연구아첨교착위최대긴교과정중교합력화흉쇄유돌기（Sternocleidomastoid muscle ，SCM ）기전지간적관계。방법：채용 T‐scanIII 교합기록의화 BioEMG III 기전도의，동보기록25명건강수시자 SCM 화 MM 적기전치，분석불동교합력수평하기전치여자주최대긴교（Maximal voluntary clenching ，MVC）시기전치적비치적변화。결과：M VC 시，교합력、SCM 급 MM 기전치쌍측지간무명현차이，SCM 기전폭치약위 MM 적（9．13±4．77）％～（10．23±6．47）％，SCM 급 MM 적기전비치재체도최대교합력적75％지전균정축점증고추세，단종해수평지 MVC 시균현저하강（P＜ 0．05）。결론：재자주최대긴교과정중 SCM 표현출여 MM 동보적선승고후강저적기전변화규률。
Objective :To investigate the relationship between occlusal force level and the surface electro‐myography(SEMG) activity of sternocleidomastoid muscle (SCM )versus masseter muscle(MM ) during maximal voluntary clenching (MVC) in intercuspal position(ICP) .Methods :T‐Scan III system and BioEMG III system were used to record SEMG activity of the SCM and of the MM simultaneously .Recordings which were obtained from 25 healthy young adult during MVC were analyzed in different occlusal force levels .Normalized SEMG value was ratio of SEMG values of different occlusal force levels to MVC .Results :There was no difference between bite force , SEMG value of left side and right side in ICP‐MVC .Ratios of sternocleidomastoid(SCM ) to masseter muscle activity range from (9 .13 ± 4 .77)% to(10 .23 ± 6 .47)% .In normalized SEMG value of the MM and SCM ,which increased before 75% ‐MVC ,and decreased after 75% ‐ICP(P< 0 .05) .Conclusion :The results confirmed that a lower SEMG activity of SCM is similar to MM when the highest level of bite force achieved during MVC in ICP .