# Five-canal maxillary first molar with calcified MB2 and low bifurcation of distal root canals: a case report

## TL;DR

A rare case of a maxillary first molar with unusual root canal anatomy is reported, highlighting the importance of advanced imaging for accurate diagnosis and treatment.

## Contribution

This case report presents an extremely rare anatomical variation in a maxillary first molar with five canals and calcified structures.

## Key findings

- The patient had one palatal and four buccal canals with low bifurcation of the distal root canals.
- Nonsurgical treatment resolved symptoms and imaging showed reduced apical shadowing.
- Cone-beam computed tomography is emphasized for identifying additional canals and avoiding misdiagnosis.

## Abstract

Root canal therapy is a highly regarded procedure, and failure to recognize the extremely variable anatomy of the maxillary first molars leads to unpredictable outcomes. This study reports the exceedingly rare case of a 27-year-old male with a maxillary first molar with one palatal and four buccal canals, and low bifurcation of the two distal root canals. The patient underwent nonsurgical endodontic treatment (root canal therapy), the buccal apical fistula and swelling disappeared completely, and imaging findings revealed a reduction of the apical shadow area. The patient did not experience a relapse during the 6-month follow-up period. This report suggests if thin root canal is not consistent with the root diameter, redundant root canals and low bifurcation should be considered. In maxillary first molars, it is important to find mesiobuccal 2 in the calcified root canal, still, using cone-beam computed tomography is essential for the exploration and evaluation of additional root canals, such as distobuccal 2, to prevent misdiagnosis.