CAJ | 학술논문

目的：探讨两种不对称咬合--单侧后牙反牙　合和单侧第三磨牙伸长，与正常牙　合者翼外肌磁共振影像形态的特点及规律，并从影像学角度探讨翼外肌上下头的功能。方法：分别具有上述3种咬合的受试者各10名，双侧翼外肌正矢状位MRI成像。结果：3组受试者的翼外肌上下头均表现为在大开口时缩短增粗的收缩影像，在牙尖交错位闭口和紧咬时的舒张影像。不对称咬合组双侧翼外肌在大开口状态下的影像与咬合引导的牙尖交错位偏斜有一定相关关系。结论：翼外肌上下头均在闭口时舒张、大开口时收缩；不对称咬合者双侧翼外肌开口位时的收缩活动明显不对称，且与异常咬合对牙尖交错位的引导有关。
목적：탐토량충불대칭교합--단측후아반아　합화단측제삼마아신장，여정상아　합자익외기자공진영상형태적특점급규률，병종영상학각도탐토익외기상하두적공능。방법：분별구유상술3충교합적수시자각10명，쌍측익외기정시상위MRI성상。결과：3조수시자적익외기상하두균표현위재대개구시축단증조적수축영상，재아첨교착위폐구화긴교시적서장영상。불대칭교합조쌍측익외기재대개구상태하적영상여교합인도적아첨교착위편사유일정상관관계。결론：익외기상하두균재폐구시서장、대개구시수축；불대칭교합자쌍측익외기개구위시적수축활동명현불대칭，차여이상교합대아첨교착위적인도유관。
Objective: To investigate the characteristics of magnetic resonance image of lateral pterygoid muscle in the people with normal occlusion and those with asymmetrical occlusion--unilateral posterior cross-bite or unilateral hyper-erupted third molar and to study the functions of superior and inferior heads of lateral pterygoid muscle. Methods: 30 volunteers, each 10 with one of the three types of occlusion, were adopted. Sagittal images of bilateral lateral pterygoid muscles with the mandible seated at intercuspal position with and without biting, and at mouth-open-position were taken respectively. Results: Both of superior and inferior lateral pterygoid muscles showed relaxation in-phase as the mouth closed at intercuspal position as well as bit at intercuspal position, and contracted in-phase when mouth opened. The images of lateral pterygoid muscles of those with asymmetrical occlusions showed significant asymmetrical appearances at mouth open position. Conclusion: Both of superior and inferior lateral pterygoid muscles relax in-phase as the mouth closes and as bites at intercuspal positions, and contract in-phase when mouth opens. The asymmetry action of lateral pterygoid muscles at opening in subjects with asymmetrical occlusion is related to their occlusions.