Changes in the Bilateral Balance of Masticatory Muscle Activity after Surgical Correction of Mandibular Lateral Shift: Report of 2 Cases
- *Corresponding Author:
- Hiroshi Ueda
Department of Orthodontics and Craniofacial Developmental Biology
Hiroshima University Graduate School of Biomedical Sciences
1-2-3 Kasumi Minami-ku, Hiroshima, Japan 734-8553
Tel: +81 (082) 257-5686
Fax: +81 (082) 257-5687
E mail: [email protected]
Received Date: May 28, 2012; Accepted Date: July 15, 2012; Published Date: July 18, 2012
Citation: Ueda H, Kato M, Horihata A, Tanne K (2012) Changes in the Bilateral Balance of Masticatory Muscle Activity after Surgical Correction of Mandibular Lateral Shift: Report of 2 Cases. Orthop Muscul Syst 1: 117. doi: 10.4172/2161-0533.1000117
Copyright: © 2012 Ueda H, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Objective: This case report is designed to present changes in the bilateral balance of masticatory muscle activity during daytime after surgical correction of mandibular lateral shift. Study design: Using a portable EMG recording system, masseter and anterior temporal muscle activities were recorded in two patients with lateral deviation of the mandible for three hours at pretreatment, 6 months and 12 months after surgery. Results: In case 1, the Asymmetry Ideex of masseter muscle activity during mealtime and during daytime was 0.3 at T0, 0.4 at T1and 0.1 at T2, and -0.6 at T0, 0 at T1and 0.2 at T2, respectively. With respect to anterior temporal muscle activity, the AIs were -0.1 and -0.4 at T0, -0.2 and -0.5 at T1, and 0.1 and -0.1 at T2 during mealtime and daytime. In case 2, the AI of masseter muscle activity during mealtime and during daytime was 0.3 at T0, 0.2 at T1and 0.3 at T2, and -0.3 at T0, -0.6 at T1 and -0.1 at T2, respectively. With respect to anterior temporal muscle activity, the AIs were 0 and 0 at T0, 0 and 0.3 at T1, and 0.1 and 0.3 at T2 during mealtime and daytime. Conclusion: The different differing results were shown in two similar cases, although despite the surgical correction of mandibular lateral shift producing produces considerable improvement of the bilateral balance in muscle activity during mealtime and daytime.