Spatial relationip of Temporomandibular joint in cetric relation using Magnet Resonance Image

最佳颌位的确定是口腔医学中最重要的问题之一。在Gothic弓描记法和Lucia's夹具法指导下，用MRI检查颞下颌关节的中心关系。对10例需全口咬合重建的患者和7例正常人的髁突和盘的位置进行了测量。两组均无TM障碍的体征和症状。正常人的股骨髁在正中关系上的位置几乎呈中心线，无后移迹象。盘定位在髁上。而假体组髁突较正常组有后移趋势，而非同心向移位。采用Photoshop和NIH Image两种软件，采用相对简单的图像处理技术，对颞下颌关节进行三维重建。该系统能提供准确的颞下颌关节形态和位置关系。并研制了基于触摸传感器和PC机的电动下颌跟踪仪。

The decision of the optimum jaw position is one of the most problem in dentistory. Centric relation of the TMJ guided by Gothic arch tracing and Lucia's Jig were examined by MRI. Condyle and disk positions of 10 patients, who need full mouth occusal rerconstruction prosthodontically, and 7 normal subjects with natural dentition were requruted. Both group had no any signs and symtomes of TM disorders. The codylar position at centric relation in normal subjects revealed almost centoroid and no indication of posterior displacement. Disk positioned on the condyle. In contrast, prosthetic patients group, the condyle tended to posterior displacement, not concentrically, compared with normal subject group. However, patient group whoes intercuspal position were coinside with centric relation had no any functional and clinical problems in 2.5 to 4 years after prosthetic treatment.A 3-dimensional reconstruction of temporomandibular joint were produced using two softwares, Photoshop and NIH Image, and relative simple processing technique. This system can provide accurate figures and positional relationship of TMJ. And also developed electic jaw tracing device using touch sensor and Personal computer.