Kwon Se-Ok, Lee Sangho, Lee Nanyoung
Department of Pediatric Dentistry, College of Dentistry, Chosun University, Gwangju, South Korea.
Pediatr Dent. 2016 Nov 15;38(7):143-147.
Tooth impaction is defined as any tooth that fails to erupt into a normal functional position and remains unerupted in the jaw beyond the time of its normal eruption. Primary impaction of primary teeth is rare. Furthermore, a combination of eruption failure of primary second molars and horizontally impacted permanent first molars has not yet been reported. The purpose of this study was to present the treatment of two cases of primary impaction of primary second molars combined with horizontally impacted permanent first molars. The impacted primary second molars were extracted, and orthodontic traction was performed to induce normal eruption of the permanent first molars. We then regained space for the eruption of the second premolar and applied a space maintainer to secure the space and induce successful eruption of succedaneous teeth and normal function of permanent first molars in their positions.
牙齿阻生的定义为任何未能萌出至正常功能位置且在其正常萌出时间后仍未萌出而留在颌骨内的牙齿。乳牙的原发性阻生很少见。此外，乳牙第二磨牙萌出失败与恒牙第一磨牙水平阻生同时出现的情况尚未见报道。本研究的目的是介绍两例乳牙第二磨牙原发性阻生合并恒牙第一磨牙水平阻生的治疗情况。拔除阻生的乳牙第二磨牙，进行正畸牵引以诱导恒牙第一磨牙正常萌出。然后为第二前磨牙的萌出重新获得间隙，并应用间隙保持器以维持间隙，诱导后继恒牙成功萌出，使恒牙第一磨牙在其位置发挥正常功能。
