Ueda H M, Ishizuka Y, Miyamoto K, Morimoto N, Tanne K
Department of Orthodontics, Hiroshima University School of Dentistry, Japan.
Angle Orthod. 1998 Jun;68(3):233-8. doi: 10.1043/0003-3219(1998)068<0233:RBMMAA>2.3.CO;2.
The purpose of this study was to investigate the relationship between masticatory muscle activity during the day and vertical craniofacial morphology. The sample comprised 30 subjects (20 males and 10 females, age range 15 to 28 years, mean 24 +/- 3.2 years) who had normal anteroposterior skeletal relationships and complete or nearly complete dentition without serious malocclusion or temporomandibular dysfunction. Using a portable electromyographic recording system, activities of the masseter, temporal, and digastric muscles were recorded for 3 hours during the day, excluding time spent eating, sleeping and exercising. A lateral cephalogram was taken of each subject with the teeth in occlusion. Activities of the masseter, temporal, and digastric muscles consisted mainly of low-amplitude bursts. The duration of digastric muscle activity was greater than that of either the masseter or temporal muscles. Masseter and digastric muscle activity was positively correlated. The activities of the masseter, temporal, and digastric muscles during the day consist of low-amplitude bursts and may be related to vertical craniofacial morphology.
本研究的目的是调查白天咀嚼肌活动与垂直颅面形态之间的关系。样本包括30名受试者（20名男性和10名女性，年龄范围15至28岁，平均24±3.2岁），他们具有正常的前后骨骼关系，牙列完整或接近完整，无严重错牙合或颞下颌关节功能障碍。使用便携式肌电图记录系统，在白天记录咬肌、颞肌和二腹肌的活动3小时，不包括进食、睡觉和锻炼时间。让每位受试者在牙齿咬合时拍摄一张头颅侧位片。咬肌、颞肌和二腹肌的活动主要由低振幅爆发组成。二腹肌活动的持续时间比咬肌或颞肌的持续时间更长。咬肌和二腹肌活动呈正相关。白天咬肌、颞肌和二腹肌的活动由低振幅爆发组成，可能与垂直颅面形态有关。
