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ID 115567
Title Alternative
Functional training after orthognathic surgery
Author
Kawai, Nobuhiko Kanagawa Dental University|Tokushima University KAKEN Search Researchers
Shibata, Manami Tokushima University
Watanabe, Masahiko Tokushima University
Fushima, Kenji Kanagawa Dental University
Keywords
Surgical orthodontic treatment
Orthognathic surgery
Mandibular prognathism
Masticatory function
Gum chewing exercise
Content Type
Journal Article
Description
Background/purpose: Even after surgical orthodontic treatment, the level of masticatory function in patients with jaw deformities is still lower than that of healthy subjects. The purpose of this study was to evaluate the effects of functional training program using gum chewing exercise after orthognathic surgery on masticatory function in patients with mandibular prognathism.
Materials and methods: The study subjects were 16 patients with mandibular prognathism who underwent orthognathic surgery and 8 individuals with normal occlusion. Patients were divided into two groups (training group and non-training group; n = 8 per group). Functional training included gum chewing exercise and patient-education about masticatory function. The training; gum chewing exercise of 5 min twice a day for 90 days, started at 3 months after surgery. For each subject, electromyographic activities of masseter and temporalis muscles during maximum voluntary clenching (MVC) and jaw movement during gum chewing were recorded before and after surgical orthodontic treatment. Two parameters; activity index (AI: ratio of activity of masseter and temporalis muscles) and error index (EI: ratio of the number of abnormal chewing patterns), were used.
Results: In the training group, the AI value during MVC increased significantly and the EI value during gam chewing decreased significantly after surgical orthodontic treatment (AI: p < 0.01; EI: p < 0.01), indicating the improvement of activity balance of masseter and temporalis muscles and conversion of the jaw movement from abnormal to normal pattern (p < 0.01).
Conclusion: Our findings suggested that functional training using the gum chewing and patient-education exercise improved masticatory function in patients with mandibular prognathism.
Journal Title
Journal of Dental Sciences
ISSN
19917902
NCID
AA12795373
Publisher
Association for Dental Sciences of the Republic of China|Elsevier
Volume
15
Issue
4
Start Page
419
End Page
425
Published Date
2020-04-07
Rights
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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DOI (Published Version)
URL ( Publisher's Version )
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language
eng
TextVersion
Publisher
departments
Oral Sciences
University Hospital