Lip closing force of Class III patients with mandibular prognathism: a case control study.
Lip closing force of Class III patients with mandibular prognathism: a case control study.
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下颌前突Ⅲ类患者唇闭合力的病例对照研究
DOI：
10.1186/1746-160x-10-33
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发表时间：
2014-08-26
影响因子：
3
通讯作者：
Chen F
中科院分区：
文献类型：
--
作者：
Chen S;Cai Y;Chen F
比较下颌骨无牙颌畸形患者与下颌骨无牙颌畸形患者的唇闭合力。受试者组包括62名女性患者的III类关系与下颌骨肥大。对照组包括71例I类关系无骨骼畸形的患者。使用Y-计测量最大唇缘闭合力和平均唇缘闭合力。进行学生t检验以分析组间差异。采用相关分析和多元线性回归分析法，分析唇闭合力与颅面形态的关系。下颌无颌症患者的下唇闭合力显著大于对照组（P < 0.001），而上唇闭合力无显著性差异（P > 0.05）。下颌多颌畸形患者的下唇闭合力与下切牙-下颌平面角（IMPA）和法兰克福平面-下颌平面角（FMA）呈显著正相关（P <0.001）。多元回归方程为：（MaxLL）= 12.192 - 0.125 *（IMPA）+ 0.082（FMA）;（AveLL）= 9.112 - 0.091 *（IMPA）+ 0.054（FMA）。安氏Ⅲ类下颌前突患者的下唇闭合力显著增加，并与下切牙位置和下颌平面角密切相关。
To compare the lip closing force of patients with mandibular prognathism to that of patients without dentofacial anomalies. The subject group included 62 female patients of Class III relationship with mandibular prognathism. The control group been comprised of 71 patients of Class I relationships without skeletal deformities. Maximum lip closing force and average lip closing force were measured using a Y-meter. Student’s t-test was carried out to analyse the differences between the groups. Correlation and stepwise multiple linear regression analyses were performed to analyse the relationship between lip closing force and craniofacial morphology. The lower lip closing force of subjects with mandibular prognathism was significantly greater than that of patients in the control group (P < 0.001), while the upper lip closing force showed no difference (P > 0.05). The lower lip closing force of patients with mandibular prognathism was strongly correlated with IMPA (Lower Incisor - Mandibular Plane angle, P < 0.001) and FMA (Frankfort Plane-Mandibular Plane angle, P < 0.001). Multiple regression equations: (MaxLL) = 12.192 - 0.125 * (IMPA) + 0.082 (FMA); (AveLL) = 9.112 - 0.091 * (IMPA) + 0.054 (FMA). The lower lip closing force was markedly increased in Class III patients with mandibular prognathism and was strongly correlated with lower incisor position and mandibular plane angle.