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6 不同年龄组下颌第一磨牙中1/3段近远中向根管锥度
Tab 6 Mesiodistal root canal taper of middle 1/3 segments of mandibular first molars in different age groups
Root canal typeRoot canalMesiodistal taper
Mean value20‒29 years30‒39 years40‒49 years50‒59 years
Three-canal typeMB0.04±0.050.04±0.040.03±0.060.05±0.050.04±0.04
ML0.05±0.060.07±0.070.06±0.050.06±0.060.03±0.05
D0.06±0.060.09±0.050.06±0.060.06±0.060.04±0.05
Four-canal typeMB0.06±0.050.06±0.060.07±0.060.06±0.040.05±0.04
ML0.04±0.060.05±0.060.04±0.060.04±0.050.03±0.05
DB0.08±0.070.09±0.060.07±0.070.07±0.070.08±0.08
DL0.05±0.060.05±0.050.07±0.080.04±0.060.06±0.05