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Isthmuses, accessory canals, and the direction of root curvature in permanent mandibular first molars: an in vivo computed tomography study

Restorative Dentistry & Endodontics 2020년 45권 1호 p.7 ~ 7
Dastgerdi Aria Chuppani, Navabi Manizheh, Rakhshan Vahid,
소속 상세정보
 ( Dastgerdi Aria Chuppani ) - Islamic Azad University Dental Branch Department of Dental Morphology
 ( Navabi Manizheh ) - Islamic Azad University Dental Faculty Department of Removable Prosthodontics
 ( Rakhshan Vahid ) - Islamic Azad University Dental Branch Department of Dental Morphology

Abstract


Objectives: This study was performed to assess the anatomy of mandibular first molars.

Materials and Methods: In this in vivo study, cone-beam computed tomography (CBCT) volumes of 312 bilateral intact first mandibular molars from 156 patients (79 men and 77 women; average age, 35.6 ± 11.2 years) were investigated in terms of the direction of each canal's curvature in the buccolingual and mesiodistal dimensions (direction of the position of the apex in relation to the longitudinal axis of the root), the presence of an isthmus (a narrow, ribbon-shaped communication between 2 root canals) in 3 segments (0?2, 2?4, and 4?6 mm) from the apex), and the presence and number of accessory canals (smaller canals besides the main root canals, connecting the pulp to the periodontium). Data were analyzed statistically (α = 0.05).

Results: Mesiolingual canals were mostly buccally and distally inclined, while mesiobuccal and distolingual canals were mostly distally curved. Isthmuses were more common in younger patients (χ2 test, p < 0.05). The average numbers of accessory canals in the apical, middle, and coronal segments were 9.9 ± 4.2, 6.9 ± 2.9, and 9.3 ± 3.0 canals per segment, respectively (analysis of variance, p < 0.001). Age and sex were not associated with the number of accessory canals (p > 0.05).

Conclusions: The complex anatomy of these teeth deserves attention during non-surgical or surgical endodontic treatment. Around the apex, isthmuses might be more prevalent in younger and female individuals.

키워드

Anatomy; Endodontics; Cone beam computed tomography

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