“Ex vivo” determination of the clinical anatomic diameter in human maxillary and mandibular molar teeth at different levels

Antonio Batista, André Luiz da Costa Michelotto

Objective: This study aimed to measure the clinical anatomical diameter of root canals in human molars at different levels. Methods: Fifty maxillary and fifty mandibular molars were axially cross-sectioned and analyzed at 1 mm, 5 mm and 9 mm from the anatomical apex. The fourth level was in the root canal opening. The first file adjusted at root canal walls without pushing was recorded. Mean values and standard deviations were calculated using paired t-test. Results: Diameter at root canal entrance (RCE ) and cervical level in disto-buccal canals of maxillary molars and mesiobuccal as well as mesio-lingual canals of mandibular molars were 30.71 ± 9.74 and 37.10 ± 9.17, 41.80 ± 10.71 and 46.80 ± 10.62, 37.40 ± 10.25, and 44.50 ± 10.64 (mm x 10-2), respectively. At the apical third, maxillary molars showed mean diameters of 22.00 ± 4.79, 21.80 ± 5.81, and 39.40 ± 10.18 for mesio-buccal, disto-buccal and palatal canals, respectively. For mandibular molars, mean value was 26.90 ± 9.79, 24.00 ± 6.85, and 36.44 ± 10.18 for mesio-buccal, mesio-lingual and distal canals, respectively. Conclusions: RCE of disto-buccal canals of maxillary molars and mesial canals of mandibular molars presented smaller diameter than the cervical third. Mesial canals of mandibular molars and buccal canals of maxillary molars had diameter close to #25 and #20 K-files at 1 mm apical level, respectively. Palatal canals of maxillary molars and distal canals of mandibular molars presented diameter close to #40 and #35 K-files at 1 mm apical level, respectively.

Keywords: Endodontics. Dental pulp cavity. Root canal preparation.

How to cite: Batista A, Michelotto ALC. “Ex vivo” determination of the clinical anatomic diameter in human maxillary and mandibular molar teeth at different levels. Dental Press Endod. 2018 Sept-Dec;8(3):47-54. DOI: https://doi.org/10.14436/2358-2545.8.3.047-054.oar

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