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Effect of Botulinum Toxin type A and Occlusal Splint on Masseter Muscle Evaluated with Computed Tomographic Measurement  

Jang, Hee-Young (Dept. of Oral Medicine, College of Dentistry, Yonsei University)
Kang, Seung-Chul (Dept. of Oral Medicine, College of Dentistry, Yonsei University)
Kim, Seong-Taek (Dept. of Oral Medicine, College of Dentistry, Yonsei University)
Kim, Chong-Youl (Dept. of Oral Medicine, College of Dentistry, Yonsei University)
Choi, Jong-Hoon (Dept. of Oral Medicine, College of Dentistry, Yonsei University)
Publication Information
Journal of Oral Medicine and Pain / v.30, no.2, 2005 , pp. 247-255 More about this Journal
Abstract
The purpose of this study is to evaluate the effect of botulinum toxin type A on masseter muscle atrophy and the extent of masseter muscle affected from the injection site in relation to injection dose, with and without occlusal splint therapy through computed tomographic measurement. 32 volunteers were divided into four groups - group 25U (injection dose of 25 unit), group 25Us (injection dose of 25 unit with occlusal splint), group 35U (injection dose of 35 unit), group 35Us (injection dose of 35 unit with occlusal splint). Each group consisted of 8 people. 3 positions (position 1, 2, 3 - 10mm, 20mm and 40mm from the inferior border of the mandible, respectively) were selected for the evaluation of the masseter muscle change. The following results were obtained. 1. The thickness and the cross-sectional area of the masseter muscle had reduced in all groups except for the right side thickness at position 3 of group 25U and group 25Us, and the right side thickness as well as the left side cross-sectional area at position 3 of group 35Us. In group 35Us, the thickness and the cross-sectional area of the masseter muscle had reduced significantly in all positions (P < 0.05). 2. There was no significant difference in the masseter muscle change between the injection dose of 25unit and that of 35unit. 3. The groups with occlusal splint showed greater reduction of the masseter muscle thickness than the other groups (P < 0.05). From the above results, botulinum toxin type A injection together with occlusal splint therapy in the treatment of masseter muscle hypertrophy would be clinically effective.
Keywords
masseter muscle; botulinum toxin type A injection; Computed Tomography; occlusal splint;
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