背景:众所周知乳牙相对恒牙髓室较大,牙釉质较薄,但在窝洞预备前最好对其牙冠的三维结构有个更精确的认识,才能避免意外穿髓。现有有关乳牙牙冠轮廓及髓腔形态学的研究仅限于使用普通X线照片及组织切片技术。存在不直观,破坏组织、难以精确重现原始结构等不足。微型CT作为一种? Background: It is well-known that the relatively permanent teeth have a large pulp chamber and a relatively thin enamel. However, it is better to have a more accurate understanding of the three-dimensional structure of the crown before it is prepared in order to avoid accidental penetration of the pulp. The existing studies on the contours and morphology of the crown of the deciduous teeth are limited to the use of plain radiographs and histological sections. There is not intuitive, destroy the organization, it is difficult to accurately reproduce the original structure and other deficiencies. Micro CT as a?