RESULTS: Vertucci I was the most common classification of mandibular central incisors (42.3%) while Vertucci III was most common in mandibular lateral incisors (37.9%). Females more frequently showed Vertucci I classification (49.5% central incisors and 36.7% lateral incisors) while Vertucci III was most common among males (44.5% central incisors and 41.0% lateral incisors). The difference in canal classification by sex was statistically significant (p < 0.05). 58.7% of Vertucci V canals bifurcated in the apical third (AT) in central incisors, while 69.5% bifurcated in the middle third (MT) in lateral incisors. Bifurcating and merging in AT (44.3%) was the most common style of Vertucci III canals in central incisors, while bifurcating in MT and merging in AT (53.8%) was the most common in lateral incisors.
CONCLUSIONS: The root canal morphology of mandibular incisors in children aged 9-12 was different from that reported in previous studies on adults, and closely related to sex. Males had significantly greater canal variability than females. Lateral incisors had greater canal variability than central incisors. The bifurcating/merging sites were closely related to tooth type.
结果:VertucciI是下颌中切牙最常见的分类(42.3%),而VertucciIII在下颌侧切牙中最常见(37.9%)。女性更频繁地显示VertucciI分类(49.5%的中央切牙和36.7%的侧切牙),而VertucciIII在男性中最常见(44.5%的中央切牙和41.0%的侧切牙)。按性别划分的根管分类差异有统计学意义(p<0.05)。58.7%的VertucciV管在中央切牙的根尖三分之一(AT)分叉,而69.5%的分支分布在侧切牙的中三分之一(MT)。AT的分叉和合并(44.3%)是中央切牙中VertucciIII管的最常见样式,而MT分叉和AT合并(53.8%)在侧切牙中最常见。
结论:9-12岁儿童下颌切牙根管形态与以往成人研究报告的不同,而且与性密切相关.男性的运河变异性明显大于女性。侧切牙的根管变异性大于中切牙。分叉/合并部位与牙齿类型密切相关。