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顎関節症治療のためのボツリヌス毒素A(BTX - A)の筋肉内注射後の咬合筋の咬合力特性
Occlusal force characteristics of masseteric muscles after intramuscular injection of botulinum toxin A(BTX - A)for treatment of temporomandibular disorder.
PMID: 27138229 DOI: 10.1016/j.bjoms.2016.04.008.
抄録
我々の目的は、顎関節症と咬合症を併発している患者に対して、ボツリヌス毒素A(BTX-A)を筋肉内注射した後の咬合力と咬合筋の治療効果を評価することであった。打撲症を伴う顎関節症患者30名を3群(各群n=10)に無作為に割り付け、咬合筋へのBTX-Aの両側からの筋肉内注射、プラセボ、またはコントロールで治療した。咬合力分析システムを使用して、咬合力のいくつかの測定値(咬合力と閉咬の持続時間、最大咬合力、咬合力の分布など)を収集しました。咬合間位置の咬合力は3群すべてで減少した。BTX-A群とプラセボ群では有意差があったが(F(df=1)=8.08、p=0.01)、対照群と他の2群では有意差はなかった(F(df=1)=4.34、p=0.047)。BTX-A群では、3ヶ月の治療後に閉塞期間が有意に増加した(t=4.07、p=0.003)。咬合力の非対称な分布は3群ともに減少したが、有意ではなかった(Leveneの検定F(df=2)=0.25, p=0.78,ANOVA F(df=2)=0.50, p=0.61)。BTX-Aによる顎関節症の治療は咬合力の低下に有効であるが、心理的介入が治療に重要な役割を果たしている。
Our aim was to evaluate the occlusal force and therapeutic efficacy of the masseteric muscles after intramuscular injection of botulinum toxin A (BTX-A) for the treatment of patients with concurrent temporomandibular disorders (TMD) and bruxism. Thirty patients with TMD associated with bruxism were randomised into three groups (n=10 in each group), and treated by bilateral intramuscular injection of BTX-A into the masseter, placebo, or control. We used an occlusal force analysis system to collect several measures of occlusal force such as duration of biting and closing, the maximum occlusal force, and the distribution of occlusal force. The occlusal force in the intercuspid position was reduced in all three groups. There was a significant difference between the BTX-A and placebo groups (F(df=1)=8.08, p=0.01) but not between the control group and the other two(F(df=1)=4.34, p=0.047). The duration of occlusion was significantly increased in the BTX-A group after 3 months' treatment (t=4.07, p=0.003). The asymmetrical distribution of occlusal force was reduced in all three groups, but not significantly so (Levene's test F(df=2)=0.25, p=0.78,ANOVA F(df=2)=0.50, p=0.61). Treatment of TMD with BTX-A is effective in reducing the occlusal force, but psychological intervention plays an important part in treatment.
Copyright © 2016 The British Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.