固定桥系以缺牙区的邻牙为基牙的固定修复体。其所受的咬合压力完全由支持的基牙承担,故基牙是固定桥的支持者与受力的承担者。由于固定桥的类型不同及基牙数目与排列的不同,受咬合压力时,各基牙的受力分布亦不一样。全国高等医药院校试用教材《口腔矫形学》1962年版及1980年版,都有同样的基牙受力分布图,(图一)。有人认为“图难理解,是否有矛盾”。作者认为这是力学问题,没有 Fixed bridge system to the edentulous area of ​​the adjacent teeth for the abutment fixed prosthesis. The occlusal pressure is completely borne by the supporting abutment, so the abutment is the supporter and the undertaker of the fixed bridge. Due to the different types of fixed bridges and the different numbers and arrangement of abutments, the stress distribution of the abutments is different when they are under the occlusion pressure. The national medical colleges and universities teaching materials “orthodontics” 1962 edition and 1980 edition, have the same distribution of abutment force, (Figure 1). Some people think that “figure difficult to understand, is there any contradiction.” The author thinks this is a mechanical problem, no