下颌第一磨牙根管直径和锥度的锥形束CT测量分析

李文妙, 邢莉, 潘英瑜, 黄滢, 杨国访, 刘德达

Cone-beam CT measurement of root canal diameter and taper for mandibular first molar

LI Wenmiao, XING Li, PAN Yingyu, HUANG Ying, YANG Guofang, LIU Deda

表1 下颌第一磨牙不同根管类型的年龄组性别分布

Tab 1 Gender distribution of mandibular first molars with different root canal types across age groups

Root canal type	Gender	Group				Total
Root canal type	Gender	20‒29 years	30‒39 years	40‒49 years	50‒59 years	Total
Three-canal type (n=120)	Male/n(%)	16 (53.3)	20 (66.7)	12 (40.0)	16 (53.3)	64 (53.3)
	Female/n(%)	14 (46.7)	10 (33.3)	18 (60.0)	14 (46.7)	56 (46.7)
Four-canal type (n=120)	Male/n(%)	9 (30.0)	14 (46.7)	14 (46.7)	20 (66.7)	57 (47.5)
	Female/n(%)	21 (70.0)	16 (53.3)	16 (53.3)	10 (33.3)	63 (52.5)