[Changes in bite force and electromyographic activities of masticatory muscles in prognathic patients after orthognathic surgery]

The orthognathic surgery not only can alter facial appearance and occlusion, but also can affect the morphology, physiology, and biomechanics of craniofacial skeleton and the muscles of mastication. The purpose of this study was to investigate the changes in maximum bite force and electromyographic activity of masticatory muscles after sagital split ramus Lefort I osteotomy in patients with mandibular prognathism. A clinical trial was conducted on 14 patients with mandibular prognathism. Maximum bite force in 7 predefined points of dentition as well as electromyographic activity of masseter and temporalis muscles preoperatively, and at 3- and 6-month follow ups were measured in the patients. The analysis of variance for repeated measures and paired T-test served for analysis of longitudinal changes in maximum bite force and electromyographic activity of muscles. Three months after surgery, both bite force and electrical activities of mandibular muscles of patients were significantly less than those of before surgery [P <0.05]. Although all parameters were improved 6 months after surgery, maximum bite force in molar region did not reach the preoperative value. All other parameters at 6-month follow up increased by 10 to 15 percent compared to preoperative measurements. The findings of this study suggest that the maximum bite force and electrical activity of masticatory muscles in patients with mandibular prognathism may adapt to the new situation resulted from orthognathic surgery in six months after surgery; yet their return to the preoperative measurements is possible

Síndrome de Eagle: relatos de caso

Introdução: O processo estilóide do osso temporal é uma projeção óssea que corresponde à origem dos músculos estilo-faríngeo, estilo-hiódeo e estiloglosso. A síndrome de Eagle se caracteriza pela presença de sintomas, como otalgia, disfagia, odinofagia e dor facial, associados ao aumento do processo estilóide maior que 30 mm. Objetivo: Apresentar três casos clínicos de pacientes com diagnóstico de síndrome de Eagle e discutir a apresentação clínica e o tratamento desta doença. Conclusão: O tratamento cirúrgico com ressecção de parte do processo estilóide está relacionado à remissão dos sintomas nos pacientes com diagnóstico de síndrome de Eagle. A abordagem a partir de cervicotomia alta determina boas condições de exposição do processo estilóide, com ressecção mais ampla e preservação de estruturas vasculonervosas.