关于有牙颌与无牙颌的正中关系位与正中(牙合)位已有许多研究,一般认为多数人(约90％)有两个位置,少部分人(约10％)为一个位置。目前常规对无牙颌总义齿修复取正中(牙合)关系的方法有卷舌、吞咽、下颌引导等,在一些患者则可能将正中(牙合)位取在正中关系位上,这样在戴入义齿后可出现下颌略为前伸,若义齿为有尖牙则形成上下颌义齿 There have been many studies on the median and occlusal positions of the occlusal and edentulous jaws. It is generally accepted that the majority (about 90%) has two positions, with a minority (about 10%) being one position. At present, there are curly tongue, swallowing and mandibular guidance methods for the correction of the occlusal relationship of the general dentition denture. In some patients, it is possible to take the median occlusal point in the median relation, Denture may appear after the lower jaw slightly forward, if the denture is a canine to form upper and lower denture