中华口腔医学研究杂志(电子版) ›› 2008, Vol. 02 ›› Issue (01) : 67 -74. doi: 10.3877/cma.j.issn.1674-1366.2008-01-013 × 扫一扫
临床研究
收稿日期:
出版日期:
通信作者:
Xun MA1, Da-wei WANG1,†(), Bin CAI1, Xi LIN1, Shuang-lin ZHU1, Yang WANG1
Received:
Published:
Corresponding author:
马迅, 王大为, 蔡斌, 林熙, 朱双林, 王洋. Twin-block 矫治器治疗下颌后缩安氏Ⅱ1 类错 儿童咬肌厚度变化[J/OL]. 中华口腔医学研究杂志(电子版), 2008, 02(01): 67-74.
Xun MA, Da-wei WANG, Bin CAI, Xi LIN, Shuang-lin ZHU, Yang WANG. Masseter muscle thickness changes with twin-block appliance in children with class II division 1 malocclusion and mandibular retrusion[J/OL]. Chinese Journal of Stomatological Research(Electronic Edition), 2008, 02(01): 67-74.
目的
研究Twin-block 矫治器 (TB) 治疗下颌后缩安氏Ⅱ1 类错儿童咬肌(masseter muscle,MM)厚度变化。
方法
选取下颌后缩安氏Ⅱ1 类错儿童15 例,分为TB 治疗组和对照组。 采用超声成像技术测量0、1、3、6 个月两组受试者姿势位及紧咬位MM 厚度, 计算各指标均值和厚度不对称性指数,并比较组间及组内在不同时间相应指标的差异。
结果
①TB 治疗过程中,MM 在姿势位及紧咬位厚度先减小后增大,具有统计学意义;②MM 厚度不对称性指数显著性下降,肌肉不平衡性改善。
结论
TB能消除异常肌功能状态,去除错形成的不利因素,改善口颌肌肉协调性,是一种良好的肌肉训练装置。
Objectives
To evaluate the change of thickness of masseter muscle (MM) before and after treatment with Twin-block (TB) appliance in children with Class Ⅱdivision 1 malocclusion and mandibular retrusion.
Methods
Fifteen children with Class Ⅱmalocclusion and retruded mandible were selected and divided into the TB treatment group and the control group. By using ultrasonography, the thickness of bilateral masseter muscles was measured at mandibular postural position (MPP) and at maximal voluntary clenching position (MCP) after 0,1,3,6 months for both groups respectively. Statistical analysis was performed to compare the means of the corresponding parameters and the AILCSD (asymmetry index of local cross-sectional dimension) of masseter muscles between groups, as well as the parameters among 0,1,3,6 months in each group.
Results
①MM thickness at MPP and MCP during the treatment decreased first and then increased with statistical significance; ②AILCSD of MM decreased significantly and compensated the imbalance of MM.
Conclusions
TB appliance is a muscular training device to eliminate the muscular abnormal function and disadvantage of malocclusion, which improves the coordination of the oral-maxillofacial muscles.