广东青少年上颌第一前磨牙根管弯曲情况的研究(2)
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correlation with CCA and X(P<0.01), while negative correlation with Y(P<0.05). Conclusion There are curved root canals in buccal-lingual and mesial-distal directions in the maxillary first premolars, and some curved root ca-nals were S-shaped. The curved canals incidence rate of females was higher than males.
[Key words] gender; canal curvature angle; canal access angle; curvature height; curvature distance
上颌第一前磨牙根管形态复杂,变异多[1]。根管数量方面:研究[2-4]报道其单根管率为1.3%~28.6%,双根管率为68.5%~96.07%,三根管率为0~7.0%。根管弯曲方面:周美娟[5]研究得出牙根弯曲的发生率为
41.83%;汪平等[6]研究了115颗上颌第一前磨牙发现根管弯曲的总发生率为20%,单根牙、单根多根管牙、双根牙的根管弯曲率分别为11%、18%、37%;吴大明[7]得出50.0%的根管存在颊舌向弯曲 ......
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