Case Report Dental Operating Microscope And Cone-beam Computed Tomography Used For Complicated Root Canal Therapy

Objective: The aim to evaluate the effect of complex root canal therapy(RCT) which including Oval canals, C-shaped canals, unusual morphologic variations of molars, mandibular incisor with two root canals, narrow and calcified root canals using dental operating microscope(DOM) and(or) cone-beam computed tomography(CBCT).Methods: A total of 8 complex cases which need to be endodontically treated. The related domestic and overseas literature were reviewed for analysis these cases. In view of the different root canal morphology used appropriate preparation and filling to achieve the root canal therapy completely. With the help of DOM and CBCT, The RCT of Oval canals, mandibular incisor with two root canals, narrow and calcified root canals were completed successfully. C-shaped canals and some unusual morphologic variations of molars were assisted vision by CBCT imaging.Result: Eight complex cases which including a case of C-shaped canal molar, six mandibular incisors with two root canals, four molars with oval buccal and 2 palatal root canals, a case of removing the separated instrument closed to the apex of maxillary first molar, a treatment of large periapical cyst, a case of using guided tissue regeneration(GTR) technique to treat periapical defect with fenestrations. The short-term clinical performance was acceptable.Conclusion: CBCT systems have been designed specifically to produce undistorted 3-dimensional(3D) information in the complex root canal system, which also can identify root canal morphology, number and direction et al. As is common knowledge today magnification and illumination provided by the DOM improves the ability to locate supernumerary canals and treat narrow and calcified root canals. Complex variation root canals were completed successfully with the assisted vision by CBCT imaging.