Important guarantees of the success of root canal therapy include being familiar with the anatomical fea⁃ tures of root canal system, good root canal preparation and complete root canal filling. With the development of medical imaging technology, three⁃dimensional reconstruction technology has been widely applied in root canal morphology, root canal preparation, root canal filling quality, root canal retreatment efficiency, three⁃dimensional finite elements and oth⁃ er related research. The reconstructed 3D images can be observed qualitatively and quantitatively from different angles and levels, which aid in the understanding of root canal anatomy and evaluation of the operation effect on all aspects of root canal therapy, providing important guiding significance for clinical operation. The application of 3D reconstruction technology based on micro⁃CT in the research of root canal anatomy, root canal preparation, root canal filling, root canal retreatment efficiency and three ⁃ dimensional finite element analysis are reviewed. The results of a literature review showed that the resolution of micro⁃CT is high. Furthermore, three⁃dimensional reconstruction can accurately display the fine anatomical morphology of a root canal, accurately measure the volume and morphological changes of root canal before and after root canal preparation, accurately measure the incidence and volume of the void after root canal filling and accurately calculate the volume changes of the root canal filling materials before and after root canal retreatment.Micro⁃CT is the gold standard for the morphological study of the root canal system and quality analysis of root canal preparation and filling. After three⁃dimensional reconstruction with micro⁃CT scans, a three⁃dimensional finite element model can be established to simulate the process of root canal therapy and stress analysis. This method can be used to analyze the stress distribution of root canal preparation instruments and the influence of root canal preparation on the stress distribution of tooth tissue and the root canal wall in the process of root canal filling. Then, suitable operation methods can be selected to prevent instrument breakage and root fracture. The application of three⁃dimensional recon⁃ struction⁃based micro⁃CT is of great value in the evaluation of root canal morphology and treatment.
