Abstract: Abstract：　Micro-computed tomography(Micro-CT or μCT) is an imaging method with high resolution to show the three-dimensional spatial distribution of the internal structure of teeth, which can observe the inner structure of teeth including hard dental tissues and dental pulp cavity without destroying the original objects. It is possible to measure and calculate many parameters such as the volume and surface area of the root canal. Even mechanical properties can be calculated by finite element analysis(FEA). Thus, it is attracting dental researchers' attention. This paper reviewed its application in the study of operative dentistry and endodontics.