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Open AccessArticle

Computerized Assessment of Occlusion and Muscle Activity during Use of a Multilayer Clear Retainer: A Preliminary Study

1
Department of Orthodontics, Graduate School, Kyung Hee University, Seoul 02447, Korea
2
Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, Seoul 02447, Korea
3
Division of Orthodontics, Department of Orofacial Science, University of California San Francisco, San Francisco, CA 94143, USA
*
Author to whom correspondence should be addressed.
These authors contribute equally to this work.
Sensors 2021, 21(2), 541; https://doi.org/10.3390/s21020541
Received: 9 December 2020 / Revised: 12 January 2021 / Accepted: 12 January 2021 / Published: 13 January 2021
(This article belongs to the Special Issue Sensing and Imaging Technology in Dentistry)
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. View Full-Text
Keywords: occlusion; orthodontic retainer; T-scan; electromyography; muscle activity occlusion; orthodontic retainer; T-scan; electromyography; muscle activity
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MDPI and ACS Style

Kim, K.Y.; Choi, J.-Y.; Oh, S.H.; Moon, H.-W.; Kim, S.-H.; Ahn, H.-W.; Kim, K.A; Nelson, G. Computerized Assessment of Occlusion and Muscle Activity during Use of a Multilayer Clear Retainer: A Preliminary Study. Sensors 2021, 21, 541. https://doi.org/10.3390/s21020541

AMA Style

Kim KY, Choi J-Y, Oh SH, Moon H-W, Kim S-H, Ahn H-W, Kim KA, Nelson G. Computerized Assessment of Occlusion and Muscle Activity during Use of a Multilayer Clear Retainer: A Preliminary Study. Sensors. 2021; 21(2):541. https://doi.org/10.3390/s21020541

Chicago/Turabian Style

Kim, Kyoung Y.; Choi, Jin-Young; Oh, Song H.; Moon, Hyung-Wook; Kim, Seong-Hun; Ahn, Hyo-Won; Kim, Kyung A; Nelson, Gerald. 2021. "Computerized Assessment of Occlusion and Muscle Activity during Use of a Multilayer Clear Retainer: A Preliminary Study" Sensors 21, no. 2: 541. https://doi.org/10.3390/s21020541

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