2016年 · 第51卷第08期

Microscopic root canal therapy is a method of root canal treatment using oral surgical microscope and microscopic instruments. Oral surgical microscope can provide sufficient light source and magnify the root canal system, which is beneficial to the surgeon to identify the internal structure of root canal and significantly improve the accuracy of root canal treatment. Through oral surgical microscope, it can not only diagnose and treat pulp periapical disease, but also deal with difficult cases, including exploration of missing root canals and variant root canals, treatment of calcified root canals, removal of broken instruments, repair of perforations and microapical surgery, etc., so as to improve the preservation rate of affected teeth.

Longitudinal root fissure is an incomplete or complete fissure that begins at any level of the root and usually occurs in the bucco-lingual direction of the root without involving the crown^[1]。 The etiology of root fissure is complicated and has not been completely defined. Early diagnosis and treatment are difficult, and root amputation or extraction are usually performed^[2]。 Especially those who have undergone complex dental and restorative treatments are more prone to root fissures. The Department of Dental Endodontics, School of Stomatology, Fourth Military Medical University diagnosed and treated a case of maxillary second premolar with root fissure after root canal treatment, micro-apical surgery, post-core crown restoration and other treatments after dental trauma. The report is as follows.