颏唇肌的最大闭合力与错颌类型。
Maximum closing force of mentolabial muscles and type of malocclusion.
机构信息
Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, Korea.
出版信息
Angle Orthod. 2010 Jan;80(1):72-9. doi: 10.2319/020509-78.1.
OBJECTIVE
To measure the closing force of the upper and lower lips and to ascertain the relationship between the maximum closing force of the mentolabial muscles and types of malocclusion.
MATERIALS AND METHODS
Of those who showed the full eruption of a second molar and no permanent tooth loss, 99 subjects were chosen who showed a positive overbite and ANB and no skeletal asymmetry. By using the Y-meter, which can measure the lip force in the vertical direction using a load cell, the closing forces of the upper and lower lips were measured separately. A one-way analysis of variance (ANOVA) test and the Pearson's correlation test were used to evaluate the interrelationship between lip force and dentofacial morphology.
RESULTS
The lip closing force was greater in male and Class I subjects. Upper lip force was greater than that of the lower lip in all groups. The values of lip closing forces were related to the variables of upper incisor angulation. In Class II subjects, the values of lip closing forces were also related to the vertical skeletal pattern.
CONCLUSIONS
The mentolabial muscle force was highly correlated with dentofacial structure and types of malocclusion.
目的
测量上下唇的闭合力，并确定唇颏肌最大闭合力与错牙合类型之间的关系。
材料与方法
选择 99 名第二磨牙完全萌出且无恒牙缺失、表现为正覆牙合和 ANB 且无骨骼不对称的患者，使用 Y 尺（可通过称重传感器测量唇垂直方向的力）分别测量上下唇的闭合力。采用单因素方差分析（ANOVA）和 Pearson 相关检验评估唇力与牙颌面形态之间的相互关系。
结果
男性和Ⅰ类错牙合患者的唇闭合力较大。各组中，上唇力均大于下唇力。唇闭合力值与上切牙角度变量相关。在Ⅱ类错牙合患者中，唇闭合力值也与垂直骨骼形态有关。
结论
唇颏肌力与牙颌面结构和错牙合类型密切相关。
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