论文部分内容阅读
作者用三坐标测量仪对70付正常(牙合)青年和20付重度深覆(牙合)青年的牙列石膏模型进行了纵、横(牙合)曲线曲率半径的测量研究。并用下颌运动轨迹描记仪和肌电图仪对部分受试者进行了下颌运动和咀嚼肌肌电活动的定量研究。结果表明:深覆(牙合)患者上颌纵(牙合)曲线的曲率半径增大(即(牙合)曲度减小)或为反纵(牙合)曲线,下颌纵(牙合)曲线的曲率半径减小。其下颌边缘运动时垂直向的位移增大,息止(牙合)间隙减小,颞颌关节弹响的发生率较高,嚼肌和颞肌的SP显著延长,双SP的发生率较高。作者认为深覆(牙合)是不良(牙合)型,容易引起口颌系统功能紊乱。
The authors used CMM to measure the radii of curvature of longitudinal and transverse occlusal curves of 70 orthodontic young adults and 20 paid deep overbite young men's plaster casts. The mandibular motion and the electromyographic activity of the masticatory muscles were studied quantitatively by using mandibular movement track record and electromyography. The results showed that the radius of curvature of maxillary longitudinal occlusion increased with the decrease of occlusion curvature in deep overbite patients or the vertical occlusion curve of mandibular longitudinal occlusion curve The radius of curvature decreases. The vertical displacement of mandibular margin increased, the gap between entrapment and occlusion decreased, the incidence of temporomandibular joint snapping higher, SP of chewing muscle and temporal muscle were significantly longer, and the incidence of double SP was higher. The authors believe that deep over (occlusion) is a bad type (occlusion), easily lead to oral mandibular system disorders.