Acquisition of Anatomic Parameters Concerning Molar Pulp Chamber Landmarks Using Cone-beam Computed Tomography

Introduction: Cone-beam computed tomographic (CBCT) imaging is a valuable tool for endodontic therapy. The aim of this study was to verify whether clinical use of CBCT imaging can accurately acquire parameters concerning molar pulp chamber landmarks, which are important data to help start a successful access cavity and avoid iatrogenic furcation perforations. Methods: Seventy CBCT images were used to measure 118 maxillary and 104 mandibular molars. The following vertical distances were measured: from the cusp tip/central fossa to the pulp chamber floor, to the pulp chamber ceiling, and to furcation; from the pulp chamber ceiling to furcation; from the pulp chamber floor to furcation; and the pulp chamber height. Measurements were read to the nearest 0.05 mm. Results: The measurements were as follows: the pulp chamber floor to furcation (maxillary molar: 1.97 +/- 0.58 [mean +/- standard deviation, mm], mandibular molar: 2.24 +/- 0.47), the pulp chamber ceiling to furcation (maxillary molar: 4.09 +/- 0.68, mandibular molar: 3.78 +/- 0.70), the central fossa to furcation (maxillary molar: 8.78 +/- 0.79, mandibular molar: 8.53 +/- 0.65), the central fossa to the pulp chamber floor (maxillary molar: 6.81 +/- 0.83, mandibular molar: 6.29 +/- 0.65), the central fossa to the pulp chamber ceiling (maxillary molar: 4.69 +/- 0.59, mandibular molar: 4.75 +/- 0.56); and pulp chamber height (maxillary molar: 2.12 +/- 0.81, mandibular molar: 1.53 +/- 0.68). Measurements showing the least standard deviation were the central fossa to furcation and the central fossa to the pulp chamber floor. Conclusions: CBCT imaging may be used for precise clinical acquisition of the pulp chamber landmark measurements for molars thereby facilitating successful access cavity.