Suei Yoshikazu, Mallick Parimal Chandra, Nagasaki Toshikazu, Taguchi Akira, Fujita Minoru, Tanimoto Keiji
Department of Oral and Maxillofacial Radiology, Hiroshima University Hospital, Hiroshima, Japan.
J Oral Maxillofac Surg. 2006 Jan;64(1):94-9. doi: 10.1016/j.joms.2005.10.005.
The goal was to suggest guidelines for the treatment of developing tooth buds located on the fracture line of mandibular fractures.
The long-term radiographic follow-up records of 28 patients with mandibular fractures involving 66 tooth buds were examined for the occurrence of abnormalities in development or eruption. The fates of the involved teeth were compared according to the fracture conditions and other factors, and the cause of the abnormalities was surveyed.
Abnormal findings were observed in 30 of 66 developing teeth (45%); these included deficient root formation, abnormal bend of the root, nodule formation on the root, partial obliteration of the pulp cavity, impaction, growth arrest, and external resorption. No relationship was found between the presence of abnormalities and the condition of the fracture or the developmental stage of the tooth buds. However, infection, rotation of the tooth bud, and a surgical wire passing through the follicular space were associated with arrested growth and impaction.
The tooth buds present on the fracture line should be preserved except in cases of infection, and careful attention should be paid to avoiding further injury to the tooth bud and the soft tissues of the follicle at the time of surgery.
旨在提出关于治疗位于下颌骨骨折线上正在发育的牙胚的指导方针。
对28例下颌骨骨折患者的长期影像学随访记录进行检查，这些患者共涉及66个牙胚，观察其发育或萌出过程中异常情况的发生。根据骨折情况及其他因素比较受累牙齿的转归，并调查异常原因。
66颗正在发育的牙齿中有30颗（45%）出现异常表现，包括牙根形成不足、牙根异常弯曲、牙根上形成结节、牙髓腔部分闭锁、阻生、生长停滞及外部吸收。异常情况的出现与骨折情况或牙胚的发育阶段之间未发现关联。然而，感染、牙胚旋转以及手术钢丝穿过滤泡间隙与生长停滞和阻生有关。
除感染情况外，应保留位于骨折线上的牙胚，手术时应格外注意避免对牙胚及滤泡软组织造成进一步损伤。
