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3 不同年龄组下颌第一磨牙根尖孔的近远中径
Tab 3 Mesiodistal diameters of apical foramina of mandibular first molars in different age groups
Root canal typeRoot canalMesiodistal diameter/mm
Mean value20‒29 years30‒39 years40‒49 years50‒59 years
Three-canal typeMB0.11±0.060.14±0.120.14±0.110.11±0.060.11±0.05
ML0.10±0.060.11±0.070.10±0.070.10±0.050.10±0.06
D0.16±0.070.17±0.070.17±0.070.15±0.080.14±0.06
Four-canal typeMB0.10±0.050.11±0.050.11±0.050.10±0.050.09±0.06
ML0.11±0.060.11±0.050.14±0.080.10±0.060.11±0.05
DB0.12±0.060.11±0.060.13±0.070.13±0.060.10±0.06
DL0.10±0.050.10±0.050.10±0.060.11±0.070.08±0.04