下颌第二膳牙拔除后第三磨牙能否萌出到理想位置存在许多争议。本文目的是观察下颌第二磨牙拔除后,第三磨牙的生长发育及最终位置。 材料与方法 作者选用需拔除下颌第二磨牙的63例患者(男27,女26),平均年龄约14岁(11～17岁)。拔牙后每年复诊直至下颌第三磨牙完全萌出,观察时间3～10年。在拔牙前及第三磨牙萌出完成时分别摄取标准60°头侧位片(左或右),用7项指标(下颌第三磨牙拔牙前近远中向角度,拔牙前颊舌尖距离,拔牙前7—8间隙大小,下颌第三磨牙萌出完成后近远中向角 There is much controversy over whether the third molars can erupt to the ideal position after the removal of mandibular second molar. The purpose of this paper is to observe the growth and development of the third molars and the final location after the second mandibular second molar removal. Materials and Methods The authors selected 63 patients (27 males and 26 females) with mandibular second molar removal, with an average age of 14 years (range, 11 to 17 years). After tooth extraction every year until the third mandibular complete eruption, the observation time of 3 to 10 years. Before the tooth extraction and the completion of the third molar eruption were taken standard 60 ° lateral flap (left or right), with 7 indicators (mandibular third molar before and after extraction angle in the distance, extraction of the frontal tip of the buccal cavity, tooth extraction before extraction 7-8 gap size, mandibular third molar eruption is completed in the near angle