Greenberg S N, Orlian A I
J Am Dent Assoc. 1976 Jul;93(1):125-8. doi: 10.14219/jada.archive.1976.0630.
A case history has been given with the radiographic evidence of the migration, during development of an unerupted mandibular canine from its normal position. In a 30-month period the canine assumed a horizontal position and moved to a site that was apical to the mandibular incisors, still in the confines of the cortical plates. Because erratic movements of unerupted teeth cannot be anticipated, it would seem wise to defer the elective removal of permanent teeth during the mixed dentition stage until the clinician is assured of a normal eruption pattern of the succedaneous teeth.
本文给出了一个病例，其中有X线片证据显示，一颗未萌出的下颌尖牙在发育过程中从其正常位置发生了移位。在30个月的时间里，这颗尖牙呈水平位，并移动到下颌切牙根尖的位置，仍处于皮质骨板范围内。由于未萌出牙齿的不规则移动无法预测，因此在混合牙列期推迟恒牙的选择性拔除似乎是明智的，直到临床医生确定继承恒牙的萌出模式正常。
