Harada K, Arita K, Nishino M
Shoni Shikagaku Zasshi. 1989;27(3):692-9.
A 12-year-old female with severe root resorption in the maxillary left central and lateral incisors (Case 1) and a 27-years-old female with the maxillary left canine erupted in the position of the central incisor (Case 2) were examined and treated. The findings and treatment procedures were as follows: 1. In Case 1, severe root resorption was caused by the ectopic eruption of the canine. On the lingual surface, the resorption had proceeded to a part of enamel. 2. In the Case 1, after the central and lateral incisors were extracted, the canine was carefully guided into the position of the lateral incisor. 3. In Case 2, treatment was not performed, because the chief compliant was carious lesions and the patient did not mind the malposition of the canine. 4. In both Case 1 and 2, the main reason of ectopic eruption of canines was presumably not a discrepancy between the tooth material and the basal arch length but the malposition of the tooth germ and/or abnormal eruption process of the canine.
对一名上颌左中切牙和侧切牙严重牙根吸收的12岁女性（病例1）以及一名上颌左尖牙萌出至中切牙位置的27岁女性（病例2）进行了检查和治疗。检查结果及治疗过程如下：1. 在病例1中，严重牙根吸收是由尖牙异位萌出引起的。在舌侧表面，吸收已进展至部分牙釉质。2. 在病例1中，拔除中切牙和侧切牙后，小心地将尖牙引导至侧切牙的位置。3. 在病例2中，未进行治疗，因为主要诉求是龋损，且患者不介意尖牙的错位。4. 在病例1和病例2中，尖牙异位萌出的主要原因推测不是牙量与基骨弓长度不匹配，而是牙胚位置异常和/或尖牙萌出过程异常。
