Kim Kyoung Yeon, Choi Jin-Young, Oh Song Hee, Moon Hyung-Wook, Kim Seong-Hun, Ahn Hyo-Won, Kim Kyung A, Nelson Gerald
Department of Orthodontics, Graduate School, Kyung Hee University, Seoul 02447, Korea.
Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, Seoul 02447, Korea.
Sensors (Basel). 2021 Jan 13;21(2):541. doi: 10.3390/s21020541.
The aim of this preliminary study was to evaluate the short-term changes of occlusal contacts and muscle activity after orthodontic treatment during the use of a multi-layer clear retainer. Evaluation was done with the T-scan and BioEMG systems. A total of 18 subjects were included, who were evaluated at three time intervals-T0 at debonding, T1 at one month after retainer delivery, and T2 at four months after retainer delivery. The T-scan and electromyography (EMG) data were recorded simultaneously. The T-scan system recorded the occlusion time, disclusion time and force distribution. The EMG waves were quantified by calculating the asymmetry index and activity index. The time variables changed but not significantly. Occlusal force decreased in the anterior dentition and increased in the posterior dentition during T0-T2. There was no clear evidence of a relationship between unbalanced occlusal forces and muscle activity. In most subjects, the temporalis anterior muscle was more dominant than the masseter muscle. From this preliminary computerized study, there were no significant changes in the state of the occlusion or muscle activity during the short-term retention period.
这项初步研究的目的是评估在使用多层透明保持器期间正畸治疗后咬合接触和肌肉活动的短期变化。使用T-scan和BioEMG系统进行评估。总共纳入了18名受试者，在三个时间点进行评估——T0为去粘结时，T1为佩戴保持器一个月后，T2为佩戴保持器四个月后。同时记录T-scan和肌电图（EMG）数据。T-scan系统记录咬合时间、脱离咬合时间和力分布。通过计算不对称指数和活动指数对EMG波进行量化。时间变量有变化但不显著。在T0至T2期间，前牙区咬合力下降，后牙区咬合力增加。没有明确证据表明不平衡咬合力与肌肉活动之间存在关联。在大多数受试者中，颞肌前束比咬肌更占优势。从这项初步的计算机化研究来看，在短期保持期内，咬合状态或肌肉活动没有显著变化。
