Sasaki T
Aichi Gakuin Daigaku Shigakkai Shi. 1989 Dec;27(4):1101-11.
Although extraction of the upper central incisors is very rare because of their esthetical importance, they are sometimes extracted when impaction, root resorption, abnormal morphology, severe caries and/or trauma are involved. When extracted, tooth size adjustment, crown-bridge and/or orthodontic treatment are proposed for functional and/or esthetic improvement. Two present cases were reported of Angle class I crowding with root resorption of the upper central incisors caused by apical abscess (case 1) and impacted canines (case 2). The above central incisors were extracted and orthodontic tooth alignment was performed on both cases prior to final occlusal adjustment. Problems we encountered in through these cases were tooth size ratio between the upper and lower teeth causing spacing arch and/or disharmony of occlusion. In case 1, edge to edge anterior relationship was established because the over-all tooth ratio was 93.30% which was out side one standard deviation although the upper lateral incisors were tipped mesially to create some spaces. The over-all tooth ratio in case 2, however, was 92.13% which was inside one standard deviation and normal occlusion was restored. It is suggested that final tooth size adjustment is necessary for good occlusion in extraction cases of upper central incisors.
尽管由于上颌中切牙的美学重要性，拔除该牙的情况非常罕见，但当出现阻生、牙根吸收、形态异常、严重龋齿和/或外伤时，有时也会将其拔除。拔除后，通常会建议进行牙齿大小调整、冠桥修复和/或正畸治疗，以改善功能和/或美观。本文报告了两例安氏I类拥挤病例，其中上颌中切牙因根尖脓肿（病例1）和尖牙阻生（病例2）导致牙根吸收。上述上颌中切牙均被拔除，并在最终咬合调整前对两例患者进行了正畸排牙。在这些病例中我们遇到的问题是上下牙之间的牙齿大小比例导致牙弓间隙和/或咬合不协调。在病例1中，尽管上颌侧切牙向近中倾斜以创造一些间隙，但整体牙齿比例为93.30%，超出一个标准差，因此建立了前牙切对切的关系。然而，病例2的整体牙齿比例为92.13%，在一个标准差范围内，恢复了正常咬合。建议在上颌中切牙拔除病例中，为了获得良好的咬合，最终的牙齿大小调整是必要的。
