Center for TMD and Orofacial Pain, Peking University School and Hospital of Stomatology, Beijing, China.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2012 Jun;113(6):762-5. doi: 10.1016/j.oooo.2011.11.010. Epub 2012 Mar 26.
The available scientific literature on masticatory myospasm-induced oromandibular dystonia is limited. The objective of this study was to determine the clinical characteristics of lateral pterygoid myosapsm in a series of 18 patients. Clinical and electromyographic (EMG) data of 36 patients diagnosed with masticatory muscle myospasm were reviewed, and data from 18 patients with needle EMG-confirmed lateral pterygoid myospasm were extracted for retrospective study. The study population included 6 men and 12 women with a mean age of 53.2 ± 15.3 years. Patients' chief complaints, severity and frequency of myospasm, clinical observations, video recordings, and surface/needle EMG recordings were analyzed. Despite the variety of manifestations, 3 characteristic signs and symptoms of lateral pterygoid myospasm were observed. These were: 1) jaw function disabilities; 2) difficulty in jaw closing after wide opening; and 3) involuntary jaw movements. A differential diagnosis of lateral pterygoid myospasm should be included when oromandibular dystonia is accompanied by the fore mentioned.
咀嚼肌痉挛性口下颌肌张力障碍的可用科学文献有限。本研究的目的是确定 18 例患者中翼外肌痉挛的临床特征。回顾了 36 例诊断为咀嚼肌肌痉挛的患者的临床和肌电图（EMG）数据，并提取了 18 例经针 EMG 证实的翼外肌痉挛患者的数据进行回顾性研究。研究人群包括 6 名男性和 12 名女性，平均年龄为 53.2 ± 15.3 岁。分析了患者的主要症状、肌痉挛的严重程度和频率、临床观察、视频记录和表面/针 EMG 记录。尽管表现多种多样，但观察到了 3 个翼外肌痉挛的特征性体征和症状。这些是：1）咀嚼功能障碍；2）张口后闭口困难；和 3）下颌不自主运动。当口下颌肌张力障碍伴有上述症状时，应考虑翼外肌痉挛的鉴别诊断。
