Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, PR China.
Acta Odontol Scand. 2013 Sep;71(5):1032-7. doi: 10.3109/00016357.2012.698306. Epub 2013 Jun 10.
To determine sex differences in the tissue proportions of crowns of mandibular primary central incisors in Chinese children and to quantify the volume of crown components in three dimensions using micro-computed tomography (micro-CT).
The specimens used in this study were 41 mandibular first deciduous incisor teeth with intact crowns (21 males and 20 females) obtained from patients between 5-6 years of age. Each specimen was scanned using micro-CT at a resolution of 0.05 mm and 3D-rendered images were created. The volume of each component of the crown was measured and examined for differences in different sex and ages.
The pulp chamber volume decreased with age and the volume ratio of the pulp chamber to the whole crown was significantly smaller in 6-year-olds than in 5-year-olds (p < 0.05).
Males had significantly larger tooth crown volumes and dentin volumes than females did (p < 0.001), while the volume of enamel showed no sexual dimorphism.
通过 micro-CT 定量分析中国儿童下颌乳中切牙牙冠各组织比例，探讨不同性别下颌乳中切牙牙冠各组成部分的三维体积差异。
本研究共纳入 41 颗完整牙冠的下颌乳中切牙（男 21 颗，女 20 颗），来自于 5-6 岁的患者。使用 micro-CT 以 0.05mm 的分辨率扫描标本，并创建三维渲染图像。测量牙冠各组成部分的体积，并比较不同性别和年龄之间的差异。
牙髓腔体积随年龄增长而减小，6 岁组患儿的牙髓腔体积与整个牙冠的体积比显著小于 5 岁组（p < 0.05）。
男性的牙冠体积和牙本质体积显著大于女性（p < 0.001），而牙釉质体积无性别差异。
