本文的目的是研究上颌快速扩弓治疗对下颌牙弓尖牙间及磨牙间宽度的影响和保持后的稳定性,以及这些变化与患者的面型、年龄的关系。材料和方法选自Andrew Haas 等私人诊所的28例病例,其中包括要进行尖牙间宽度研究的17例(男性8例,女性9例,开始治疗的平均年龄14岁,最小9.6岁,最大19.6岁);进行磨牙间宽度研究的22例均为不拔牙的病例(男、女性各11例,开始治疗平均年龄 The purpose of this paper is to investigate the effects of rapid maxillary expansion on the width of mandibular canines and molars and their post-preservation stability, as well as the relationship between these changes and the patient's face shape and age. Materials and Methods 28 patients selected from private practice such as Andrew Haas, including 17 for canine width studies (8 males, 9 females, average age at onset of treatment 14 years, minimum age 9.6 years, maximum 19.6 Years old); the study of the width of the molar between the 22 cases were not tooth extraction cases (male and female 11 cases, the average age of treatment began