Ribeiro Michel Campos, Regalo Simone Cecilio Hallak, Pepato André Oliveira, Siéssere Selma, de Souza Luiz Gustavo, Sverzut Cássio Edvard, Trivellato Alexandre Elias
Department of Oral and Maxillofacial Surgery and Periodontology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2011 Apr;111(4):e1-7. doi: 10.1016/j.tripleo.2010.11.009. Epub 2011 Feb 16.
The aim of this study was to identify the behavior of masticatory muscles after fractures of the zygomatico-orbital complex (ZOC) and subsequent surgical treatment, by using analyses of bite force, electromyography (EMG), and mandible mobility during a 6-month period after surgery.
Five patients with fractured ZOCs treated surgically by using an intraoral approach and fixation exclusively in the region of the zygomaticomaxillary buttress were evaluated. The control group included 12 other patients. During postoperative follow-up, bite force, mandible mobility, and EMG analysis of the masticatory muscles were evaluated.
There was an increase in bite force with time, but a decline in EMG activity during the same period. In the mandible mobility analysis, only maximum mouth-opening values increased significantly after the surgical treatment.
The masticatory musculature, according to bite force and EMG, returned to its normal condition by the second month after surgery, and maximum mouth opening was observed after the first month.
本研究的目的是通过在术后6个月内分析咬合力、肌电图（EMG）和下颌活动度，确定颧眶复合体（ZOC）骨折及后续手术治疗后咀嚼肌的行为。
评估了5例采用口内入路并仅在颧上颌支柱区域进行固定手术治疗的ZOC骨折患者。对照组包括另外12例患者。在术后随访期间，评估了咬合力、下颌活动度以及咀嚼肌的肌电图分析。
咬合力随时间增加，但同期肌电图活动下降。在下颌活动度分析中，手术治疗后仅最大开口值显著增加。
根据咬合力和肌电图，咀嚼肌组织在术后第二个月恢复到正常状态，术后第一个月观察到最大开口度。
