Hayakawa T, Mishima H, Yokota I, Sakae T, Kozawa Y, Nemoto K
Department of Dental Materials, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho, Nishi, Matsudo, Chiba, 271-8587, Japan.
Dent Mater J. 2000 Mar;19(1):87-95. doi: 10.4012/dmj.19.87.
The calcification degree of extracted human teeth was observed by using high resolution microfocus X-ray CT. As samples, upper and lower first premolars extracted from a 21-year-old female were used. The computed tomograms were produced by high resolution microfocus X-ray CT with a open vacuum X-ray source, rotating sample stage, and image sensor. The distinction between enamel and dentin was very clear, and the shape of the pulp cavity was also clearly identified. The secondary dentin was visible in the circumpulpal dentin. The color map displays showed the heterogeneity of the calcification degree not only in the dentin but also in the enamel. The enamel was divided into three layers according to the calcification degree. High resolution microfocus X-ray CT was very useful for the observation of the internal structure of human teeth without destroying the samples.
使用高分辨率微焦点X射线计算机断层扫描（CT）观察拔除的人类牙齿的钙化程度。作为样本，使用了从一名21岁女性拔除的上下第一前磨牙。计算机断层扫描图像由具有开放式真空X射线源、旋转样品台和图像传感器的高分辨率微焦点X射线CT生成。牙釉质和牙本质之间的区别非常明显，牙髓腔的形状也清晰可辨。继发性牙本质在牙髓周围牙本质中可见。彩色图谱显示不仅牙本质而且牙釉质的钙化程度都存在异质性。根据钙化程度，牙釉质被分为三层。高分辨率微焦点X射线CT对于在不破坏样本的情况下观察人类牙齿的内部结构非常有用。
