Tallgren A, Christiansen R L, Ash M, Miller R L
Department of Prosthodontics, University of Michigan, School of Dentistry, Ann Arbor, USA.
Angle Orthod. 1998 Jun;68(3):249-58. doi: 10.1043/0003-3219(1998)068<0249:EOAMAO>2.3.CO;2.
The aim of the study was to examine the effect of an oral shield treatment on orofacial muscle activity and facial morphology in children with lip and/or tongue dysfunction. The sample consisted of 7 girls and 2 boys, 7 to 12 years old. EMG recordings with and without the shield in situ were obtained when the shield was placed, and 3, 6, and 12 months later. Lateral cephalograms were obtained at the initial and 1-year stages. The lip muscles showed dominant activity when the subjects were sucking on an empty straw and during swallowing; this was strongest during the first 3 months. The mentalis, buccinator, and digastric muscles generally showed weaker activity. The anterior temporal muscle showed dominant activity during maximal clench, but after the 3-month stage a significant decrease was noted. After 1 year of treatment, no significant changes in overjet or overbite were observed. Most of the craniofacial growth changes were normal for the age group. The results indicate that treatment with an oral shield caused a decrease in orofacial muscle activity during oral functions. Although there was a slight average retraction of the maxillary incisors, the change in position was not statistically significant.
本研究的目的是探讨口腔矫治器治疗对唇和/或舌功能障碍儿童口面部肌肉活动及面部形态的影响。样本包括7名女孩和2名男孩，年龄在7至12岁之间。在佩戴矫治器时以及3个月、6个月和12个月后，分别获取佩戴矫治器和不佩戴矫治器时的肌电图记录。在初始阶段和1年阶段拍摄头颅侧位片。当受试者吸吮空吸管和吞咽时，唇部肌肉表现出主导活动；在最初3个月内这种活动最为强烈。颏肌、颊肌和二腹肌通常表现出较弱的活动。颞前肌在最大紧咬时表现出主导活动，但在3个月阶段后出现显著下降。治疗1年后，覆盖或覆合未见明显变化。该年龄组的大多数颅面生长变化是正常的。结果表明，口腔矫治器治疗导致口腔功能期间口面部肌肉活动减少。虽然上颌切牙平均有轻微后缩，但位置变化无统计学意义。
