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The accurate visualization of the endodontic system before root canal treatment is the premise for the predictable positive outcome of the clinical procedures. The conventional X-ray gives a two dimensional view of a tridimensional reality. There are anatomy details impossible to detect with 2D imaging. The Cone beam computed tomography (CBCT) gives us the possibility to view and understand the special morphology of the anatomic structures of the teeth, bone and surrounding tissues. CBCT should be standard of care when 3D imaging is necessary in endodontics. CBCT helps us visualize the root canal anatomy: number of roots and root canals, shape, cross sections, curvatures, volume of the root canals; also obscure or missed canals, proximity to the mandibular canal (IAN) or the sinus. Examining the root canal system in three dimensions is actually a great asset for the endodontic treatment. [ABSTRACT FROM AUTHOR]

Introduction: Third molar morphology is very complex due to the variety of shapes and also to the number of roots and canals, which makes its treatment a real challenge and trial for the practitioner. Objectives: This study aims to analysing the internal radicular morphology of three molars, using a contrastive substance injected on the channel and the technique of teeth transparency. Materials and method: 38 teeth extracted on various reasons were studied after removing the dental pulp. An intracanalicular injection of a contrast substance (China ink) followed. The teeth were decalcified using nitric acid and were subsequently made transparent by using methil salicilate in order to point out aspects of internal radicular anatomy. Results: Third maxillary molars presented Ventucci types II and IV canals for mesio-vestibulary root, Ventucci I type canals for disto-vestibular and palatal roots. Intercanalicular communication was frequntly found at the level of the mesio root and lateral canals were found especially in the apical third. Conclusions: Knowledge of internal radicular morphology considerably improves the therapeutic vision leading to the suceess of endodontic treatment. [ABSTRACT FROM AUTHOR]

Recovery of the molars with extensive coronary distructions and divergent roots pose a degree of difficulty in terms of access, of endodontic treatment and of crown realization either individually or as aggregation element. However, they become a necessity in clinical situations where can not put implant up to the second or third molars, for the morpho-functional maintaining and restoring of the dental alveolar arch. The indirect method enables the abutment morphology realization perfectly suited for the indicated future crown, by modeling, in the laboratory, even from the wax layout of the corono-radicular cast reconstruction. Depending on the degree of divergence of the roots is chosen for a cast reconstruction of the abutment with one or two mobile pins or for a cast reconstruction with matrix and patrix. [ABSTRACT FROM AUTHOR]