Angle Orthod. 2019 Sep;89(5):781-787. doi: 10.2319/090518-651.1. Epub 2019 Mar 11.
To evaluate and compare the detection of gubernacular canals (GC) and their characteristics in normal and abnormal tooth eruption.
Patients with unerupted teeth were classified according to sex and age. Each tooth was classified according to dental group, eruption status, formation status, angulation, and GC detection. The opening of the GC in the alveolar crest and the attachment sites in relation to the dental follicle were assessed. Data were analyzed by the chi-square and Kruskal-Wallis tests, with a significance level of 5%.
Cone-beam computed tomography scans of 159 patients were evaluated. The final sample (N = 598) consisted of 423 teeth with normal eruption, 140 impacted teeth, and 35 teeth with delayed eruption. The overall detection rate of GC was 90.6%. These rates were 94.1%, 87.1%, and 62.9% for normal eruption, impacted teeth, and delayed eruption, respectively. GC detection rates were higher in the early stages of tooth formation in normal tooth eruption and in impacted teeth. The rate of GC detection was even lower in delayed teeth when they were angulated. Unusual attachment sites of the GC to the dental follicle were associated with abnormal eruption status.
The results of the present study suggest that GC characteristics may indicate an abnormal eruption status.
评估和比较正常和异常牙齿萌出中 gubernacular 管（GC）的检测及其特征。
根据性别和年龄对未萌出牙齿的患者进行分类。根据牙组、萌出状态、形成状态、角度和 GC 检测对每颗牙齿进行分类。评估 GC 在牙槽嵴中的开口以及与牙囊的附着部位。采用卡方检验和 Kruskal-Wallis 检验对数据进行分析，显著性水平为 5%。
对 159 例患者的锥形束 CT 扫描进行了评估。最终样本（N=598）包括 423 颗正常萌出的牙齿、140 颗阻生牙和 35 颗萌出延迟的牙齿。GC 的总体检出率为 90.6%。正常萌出、阻生牙和萌出延迟的 GC 检出率分别为 94.1%、87.1%和 62.9%。在正常萌出和阻生牙中，牙齿形成早期 GC 的检出率较高。当牙齿倾斜时，GC 的检出率甚至更低。GC 与牙囊的异常附着部位与异常萌出状态有关。
本研究结果表明，GC 特征可能预示着异常的牙齿萌出状态。
