肌激动器治疗后软组织侧貌及肌电活动的变化。

Changes in soft tissue profile and electromyographic activity after activator treatment.

作者信息

Erdem Abdulvahit, Kilic Nihat, Eröz Barçin

机构信息

Department of Orthodontics, Faculty of Dentistry, Atatürk University, Rize, Turkey.

出版信息

Aust Orthod J. 2009 Nov;25(2):116-22.

PMID:20043545

Abstract

BACKGROUND

To date, few studies have correlated the changes in muscle activity and specific soft tissue variables in adolescents with malocclusions.

OBJECTIVE

To determine associations between the soft tissue profile and electromyographic activities in temporalis, masseter and orbicularis oris muscles in children with Class II division 1 malocclusions treated with activators.

METHODS

For this prospective study, 25 subjects with Class II division 1 malocclusions were randomly assigned to either a Treatment group (N=15) or a Control group (N=10). The mean skeletal ages of the subjects in the Treatment and Control groups were 11.3 +/- 1.1 and 11.0 +/- 1.3 years, respectively. The subjects in the Treatment group were treated with activators and the subjects in the Control group were untreated. Lateral cephalometric radiographs and EMG recordings of the anterior temporalis and masseter muscles during clenching, chewing and swallowing and the orbicularis oris muscle during whistling were obtained at the start of the study and 12 months later. Changes in the soft tissue profile were correlated with changes in the EMG activities in anterior temporalis, superficial masseter and orbicularis oris muscles.

RESULTS

The upper lip to E line distance (UL-E) decreased more in the Treatment group than the Control group (p < 0.05) and the H angle decreased in the Treatment group, but increased in the Control group (p < 0.01). The EMG activities of temporalis and masseter muscles increased significantly in both groups. All between-group EMG differences were statistically significant with the exception of the activities in the temporalis and masseter muscles during swallowing. In the Treatment group, a significant positive correlation (r = .57) was found between the changes in UL-E and anterior temporalis activity during swallowing, and significant negative correlations were observed between the EMG activity of masseter muscle during swallowing and changes in LL-E (r = -.54), OLp-UL (r = -.55) and OLp-LL (r = -.67).

CONCLUSIONS

Activator therapy is accompanied by changes in the lips and temporalis and masseter activities during swallowing.

摘要

背景

迄今为止，很少有研究将青少年错牙合畸形患者的肌肉活动变化与特定软组织变量联系起来。

目的

确定使用肌激动器治疗的安氏II类1分类错牙合畸形儿童的软组织侧貌与颞肌、咬肌和口轮匝肌肌电图活动之间的关联。

方法

在这项前瞻性研究中，将25例安氏II类1分类错牙合畸形受试者随机分为治疗组（N = 15）和对照组（N = 10）。治疗组和对照组受试者的平均骨骼年龄分别为11.3±1.1岁和11.0±1.3岁。治疗组受试者使用肌激动器进行治疗，对照组受试者不进行治疗。在研究开始时和12个月后，获取头颅侧位X线片以及在紧咬、咀嚼和吞咽时颞肌前束和咬肌的肌电图记录，以及吹口哨时口轮匝肌的肌电图记录。软组织侧貌的变化与颞肌前束、咬肌浅层和口轮匝肌肌电图活动的变化相关。

结果

治疗组上唇至E线距离（UL-E）的减小幅度大于对照组（p < 0.05），治疗组H角减小，而对照组H角增大（p < 0.01）。两组颞肌和咬肌的肌电图活动均显著增加。除吞咽时颞肌和咬肌的活动外，所有组间肌电图差异均具有统计学意义。在治疗组中，吞咽时UL-E的变化与颞肌前束活动之间存在显著正相关（r = 0.57），并且观察到吞咽时咬肌的肌电图活动与LL-E（r = -0.54）、OLp-UL（r = -0.55）和OLp-LL（r = -0.67）的变化之间存在显著负相关。