Oda Masafumi, Nishida Ikuko, Miyamoto Ikuya, Habu Manabu, Yoshiga Daigo, Kodama Masaaki, Osawa Kenji, Tanaka Tatsurou, Kito Shinji, Matsumoto-Takeda Shinobu, Wakasugi-Sato Nao, Nishimura Shun, Tominaga Kazuhiro, Yoshioka Izumi, Maki Kenshi, Morimoto Yasuhiro
Division of Oral and Maxillofacial Radiology, Kyushu Dental University, Kitakyushu, Japan.
Division of Developmental Stomatognathic Function Science, Kyushu Dental University, Kitakyushu, Japan.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2016 Oct;122(4):511-6. doi: 10.1016/j.oooo.2016.07.006. Epub 2016 Jul 20.
To elucidate the characteristics of the gubernaculum tracts (GTs) in maxillary anterior teeth with normal or delayed eruption and in mesiodens by using multidetector computed tomography and cone beam computed tomography.
The characteristics of GTs in maxillary anterior teeth of 205 patients with impacted mesiodens were retrospectively analyzed by using multidetector computed tomography and cone beam computed tomography. The GTs of teeth with normal or delayed eruption and the GTs of mesiodens were examined.
The detection ratio of GTs in impacted mesiodens and anterior teeth with delayed eruption was significantly lower than in teeth with normal eruption. A significant difference in the angulation was found between normal and delayed eruptions. Almost all detectable GTs in the inverted mesiodens were derived from the incisive canal, while the remaining were from the alveolar crest. The connecting area of major GTs to tooth in inverted mesiodens was the cervical or root area, but in all other anterior teeth, it was the crown area.
GTs of inverted mesiodens may exhibit characteristics that are different from those of normal GTs when the teeth and/or the palate are developing.
通过使用多排螺旋计算机断层扫描和锥形束计算机断层扫描，阐明正常萌出或萌出延迟的上颌前牙以及多生牙的 gubernaculum 束（GTs）的特征。
通过使用多排螺旋计算机断层扫描和锥形束计算机断层扫描，对205例多生牙阻生患者的上颌前牙 GTs 特征进行回顾性分析。检查正常萌出或萌出延迟牙齿的 GTs 以及多生牙的 GTs。
多生牙阻生和萌出延迟的前牙中 GTs 的检出率显著低于正常萌出的牙齿。正常萌出和萌出延迟之间在角度上存在显著差异。几乎所有倒置多生牙中可检测到的 GTs 均源自切牙管，其余则源自牙槽嵴。倒置多生牙中主要 GTs 与牙齿的连接区域为颈部或根部区域，但在所有其他前牙中，为冠部区域。
当牙齿和/或腭部发育时，倒置多生牙的 GTs 可能表现出与正常 GTs 不同的特征。
