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Three-Dimensional Evaluation of Accessory Canals in Primary Maxillary Molars Using Micro-CT
Alice Moura Martins1, Juliana de Medeiros Matos1, Carolina Oliveira de Lima2
1Department of Preventive and Community Dentistry, School of Dentistry, State University of Rio de Janeiro (UERJ), Rio de Janeiro, RJ, Brazil.
Brazilian Dental Journal
|July 1, 2026
Summary
Accessory canals are common in primary maxillary molars, especially in the apical third. This highlights the complex internal anatomy and need for careful endodontic treatment.
Area of Science:
- Dentistry
- Endodontics
- Pediatric Dentistry
Background:
- Primary maxillary molars have complex internal anatomy.
- Accessory canals can impact endodontic treatment outcomes.
Purpose of the Study:
- To characterize the internal anatomy of primary maxillary molars.
- To evaluate the presence and distribution of accessory canals using micro-computed tomography (micro-CT).
Main Methods:
- Micro-computed tomography (micro-CT) was used to scan 17 primary maxillary molars.
- Image analysis was performed using ImageJ, CTan, and CTvol software.
- Accessory canals were identified, counted, and categorized by root third.
Main Results:
- 68.08% of analyzed roots had at least one accessory canal.
- The apical third had the highest prevalence and number of accessory canals (42.71%).
- The cervical third had the lowest prevalence and number of accessory canals (17.71%).
Conclusions:
- Accessory canals are highly prevalent in primary maxillary molars, particularly in the apical third.
- The complex internal anatomy necessitates thorough endodontic management.
- Micro-CT is a valuable tool for characterizing root canal morphology.
