Natural and Life Sciences Centre, Federal University of Bahia, Bahia, Brazil.
J Oral Rehabil. 2010 Aug;37(8):596-603. doi: 10.1111/j.1365-2842.2010.02092.x. Epub 2010 Jun 4.
The aim of the present study was to verify the relationship between the angle of the coronoid process of the mandible in the latero-lateral direction and electromyographic activity of the anterior part of the temporal muscle in skeletal Class I and III individuals. Forty-five volunteers were assessed subdivided into two groups, according to angle ANB, in Class I and III. Two radiographic examinations were performed, one lateral cephalogram to measure angle ANB and one frontal cephalogram to measure the angle of the coronoid process. The electromyographic examination of the volunteers' temporal muscles was performed. Statistical analysis of the data showed that the relationship between the angle of the coronoid process and the skeletal class was negative for both classes analysed. The relationship between electromyographic activity of the temporal muscle and angle of the coronoid process was negative for Class I individuals. In the Class III group, smaller angles of the coronoid process were related to higher values of electromyographic activity of the temporal muscle. There was no statistically significant difference between the electromyographic activity of the temporal muscle in skeletal Class I and III individuals. Based on the results obtained, it was concluded that there was no influence of the skeletal classes analysed on the angle of the coronoid; the angle of the coronoid process may be influenced by the electromyographic activity of the temporal muscle in the Class III group; the electromyographic activity of the temporal muscle is not influenced by the skeletal class in Class III individuals.
本研究旨在验证下颌骨冠状突在侧方方向的角度与Ⅰ类和Ⅲ类骨骼个体颞肌前部分的肌电图活动之间的关系。45 名志愿者根据 ANB 角分为Ⅰ类和Ⅲ类两组进行评估。进行了两次放射学检查，一次侧位头颅侧位片测量 ANB 角，一次额状头颅侧位片测量冠状突角度。对志愿者颞肌的肌电图检查。数据分析显示，对于分析的两组，冠状突角度与骨骼分类之间的关系均为负相关。Ⅰ类个体的颞肌肌电图活动与冠状突角度之间存在负相关。在Ⅲ类组中，较小的冠状突角度与颞肌肌电图活动的较高值相关。Ⅰ类和Ⅲ类骨骼个体的颞肌肌电图活动之间无统计学差异。基于获得的结果，得出结论，分析的骨骼分类对冠状突角度没有影响；冠状突角度可能受Ⅲ类组颞肌肌电图活动的影响；Ⅲ类个体的颞肌肌电图活动不受骨骼分类的影响。
