Characteristics of masticatory muscles in children with unilateral posterior crossbite
Characteristics of masticatory muscles in children with unilateral posterior crossbite
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DOI：
10.1590/s1806-83242010000200013
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发表时间：
2010-06-01
影响因子：
2.5
通讯作者：
Rossi, Moara De
中科院分区：
文献类型：
--
作者：
Andrade, Annicele da Silva;Gavião, Maria Beatriz Duarte;Rossi, Moara De
本研究的目的是检测可能存在的差异，肌电图（肌电图）活动，咀嚼率（CR），周期持续时间（CD）和首选咀嚼侧（PCS）之间的儿童与不单侧后牙反。选择巴西Piracicaba牙科学校儿童牙科门诊的37名7 ~ 10岁儿童，分为单侧后牙反牙合组（UPCB组，n = 17）和正常牙合组（NOccl组，n = 20）。使用目视抽查方法测定PCS。在咀嚼过程中记录EMG活动，并评估两个20 s的咀嚼序列，以建立每个受试者的CR（周期/秒）和CD。UPCB和NOccl组没有PCS。两组之间的EMG活动和周期特征没有差异。CD、CR与肌电活动之间的相关性仅在NOccl组的咬肌和颞前肌中有统计学意义，其中咬肌和颞前肌的肌电活动之间也有显著相关性。总之，这些研究结果表明，虽然儿童与无UPCB提出了一个双边咀嚼模式与相似的CR和CD，平衡的咬肌和颞肌前肌的肌电活动，观察只有在NOccl组。这些结果表明，在儿童中，UPCB可以改变咀嚼肌在咀嚼过程中的协调性。
The aim of this study was to detect possible differences in the EMG (electromyography) activity, chewing rate (CR), cycle duration (CD) and preferred chewing side (PCS) between children with and without unilateral posterior crossbite. Thirty-seven children aged from 7 to 10 years were selected from the clinic of the Department of Pediatric Dentistry, Piracicaba Dental School, Brazil, and divided into two groups: unilateral posterior crossbite (UPCB group, n = 17), and normal occlusion (NOccl group, n = 20). The PCS was determined using a visual spot-checking method. The EMG activity was recorded during mastication, and two chewing sequences of 20 s were evaluated to establish each subject's CR (cycles/sec) and CD. UPCB and NOccl groups did not have a PCS. The EMG activity and the cycle characteristics did not differ between the groups. The correlations between CD, CR and EMG activity were statistically significant for the masseter and anterior temporalis muscles only in the NOccl group, in which there was also a significant correlation between the EMG activity of masseter and anterior temporalis. In conclusion, these findings suggest that although children with and without UPCB presented a bilateral masticatory pattern with similar CR and CD, balanced EMG activity of masseter and anterior temporalis muscles was observed only in the NOccl group. These results indicate that in children, UPCB can alter the coordination of masticatory muscles during mastication.