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The MB3 canal in maxillary molars: a micro-CT study
Ronald Ordinola-Zapata1,2, Jorge N R Martins3,4,5, Hugo Plascencia6
1Department of Endodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil. ronald.ordinola@me.com.
Clinical Oral Investigations
|May 9, 2020
Summary
The third canal in the mesiobuccal (MB) root of maxillary molars, known as MB3, is a rare finding. This anatomical variation often presents complex internal root canal anatomy, including thin dentine thickness and multiple foramina.
Area of Science:
- Endodontics
- Dental Anatomy
- Micro-Computed Tomography
Background:
- Maxillary molars exhibit complex root canal anatomy.
- Understanding variations in the mesiobuccal (MB) root is crucial for successful endodontic treatment.
- The presence of a third canal (MB3) in the MB root is an uncommon anatomical variation.
Purpose of the Study:
- To investigate the internal and external morphologies of the mesiobuccal (MB) root in maxillary molars with a third root canal (MB3).
- To utilize micro-computed tomography (micro-CT) for detailed analysis of this rare anatomical feature.
Main Methods:
- Micro-computed tomography (micro-CT) was used to scan 265 maxillary molars.
- Sixteen molars with an MB3 canal were selected for detailed analysis.
- Evaluated parameters included root configuration, dentine thickness, MB root canal anatomy, MB3 orifice location and type, and apical anatomy.
Main Results:
- A high variability in MB root canal configurations was observed.
- The MB3 canal was identified in 16 selected molars.
- Minimal dentine thickness was noted around the MB3 canal, and complex internal anatomy, including isthmuses and multiple foramina, was frequently observed, especially in the apical third.
Conclusions:
- The MB3 canal is a rare anatomical variation in maxillary molars.
- Its presence is associated with complex internal anatomy of the MB root, including thin dentine and intricate apical structures.
- Awareness of this variation is important for endodontic treatment planning and execution.
