牙列缺损是一种常见的口腔缺损畸形。由于缺牙的部位与数目不同,对功能和美观所产生的影响差异很大。当上下咬合关系正常时,缺牙修复按一般原则和设计制作部分义齿,即可比较容易地达到恢复功能和改善外观。然而,上下颌在水平或垂直向咬合关系,由于种种原因造成了严重异常,对功能和美观的影响较大,修复困难。同时由于年龄和种种客观因素,不能在修复前用正畸 Dentition defect is a common oral defect. Due to the lack of parts and the number of different teeth, the impact on function and appearance vary greatly. When the relationship between the upper and lower bite normal, the lack of teeth repair the general principles and design of some dentures, you can easily restore the function and improve the appearance. However, the upper and lower jaw in the horizontal or vertical occlusion relationship, due to various reasons, caused a serious anomaly, the greater impact on function and appearance, repair difficult. At the same time due to age and various objective factors, can not be orthodontic before repair