Abstract
This article describes and discusses a method to determine root curvature radius by using cone-beam computed tomography (CBCT). The severity of root canal curvature is essential to select instrument and instrumentation technique. The diagnosis and planning of root canal treatment have traditionally been made based on periapical radiography. However, the higher accuracy of CBCT images to identify anatomic and pathologic alterations compared to panoramic and periapical radiographs has been shown to reduce the incidence of false-negative results. In high-resolution images, the measurement of root curvature radius can be obtained by circumcenter. Based on 3 mathematical points determined with the working tools of Planimp software, it is possible to calculate root curvature radius in both apical and coronal directions. The CBCT-aided method for determination of root curvature radius presented in this article is easy to perform, reproducible and allows a more reliable and predictable endodontic planning, which reflects directly on a more efficacious preparation of curved root canals.
Highlights
Conventional endodontic treatment is based on emptying, shaping, disinfecting and filling of the root canal system
This article describes and discusses a method to determine root curvature radius using cone-beam computed tomography (CBCT) images analyzed by a specific software
Knowledge of root curvature radius allows a more accurate planning of root canal instrumentation and minimizes the impact of the anatomic difficulties and limitations of the endodontic instruments. This method permits the maintainance of the curves associated with continuously tapered shapes and prevents structural deformations of the endodontic
Summary
Conventional endodontic treatment is based on emptying, shaping, disinfecting and filling of the root canal system. Endodontic planning is related to the identification of different aspects observed in radiographic images, including anatomic complexity, presence of material in the root canal, dental development disturbances, and progression, regression and maintenance of apical periodontitis (AP). Several studies have determined the curvature of the root canals by the angle and the radius methods [2,3,68,10,12,15] using periapical radiographic images. This article describes and discusses a method to determine root curvature radius using CBCT images analyzed by a specific software. (CDT Informatics, Cuiabá, MT, Brazil), root curvature radius can be calculated in both apical and coronal directions. The values of root curvature radius considering the two 6-mm semistraight lines are classified as follows: small radius (r≤4 mm): severe curvature; intermediary radius (r>4 and r≤8 mm): moderate curvature; and large radius (r>8 mm): mild curvature
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