Journal of Conservative Dentistry

: 2011  |  Volume : 14  |  Issue : 4  |  Page : 436--437

Maxillary first Molar with three canal orifices in MesioBuccal root

Leyla B Ayranci, Hakan Arslan, H Sinan Topcuoglu 
 Department of Restorative Dentistry and Endodontic, Faculty of Dentistry, Ataturk University, Erzurum, Turkey

Correspondence Address:
Hakan Arslan
Department of Endodontic, Faculty of Dentistry, Ataturk University, Erzurum, 25240


The present case describes root canal treatment in a maxillary first molar with unusual anatomy. A male patient was referred for the treatment of maxillary left first molar tooth. Clinical examination of the pulpal floor revealed 3 orifices in the mesio buccal root. The tooth was treated successfully. Anatomic variations must be taken into consideration in clinical and radiographic evaluation during endodontic treatment

How to cite this article:
Ayranci LB, Arslan H, Topcuoglu H S. Maxillary first Molar with three canal orifices in MesioBuccal root.J Conserv Dent 2011;14:436-437

How to cite this URL:
Ayranci LB, Arslan H, Topcuoglu H S. Maxillary first Molar with three canal orifices in MesioBuccal root. J Conserv Dent [serial online] 2011 [cited 2020 May 31 ];14:436-437
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In a previous report, the prevalence of a second mesiobuccal (MB2) canal for type 2 (2-1) was found 42% in males and 37% in females; for type 4(2) was found in 29% and 27% males and females, respectively. However, the prevalence of a MB3 canal is infrequent. For type 8 (3), total prevalence in males and females was found 0%, for both additional types XVII (-3-1) and type XVIII (3-1) the total prevalence in males was found 1% and 0% was reported in females. [1] This article discusses the successful nonsurgical endodontic management of permanent maxillary first molar presenting with the anatomical variation of 3 roots and 5 canals (three mesiobuccal, one distobuccal and one palatal canal).

 Case Report

A 22 years old male patient was referred to the clinic for the treatment of maxillary left first molar tooth. Patient reported the complaint of pain for the preceding 2 weeks. Clinical examinations revealed a tooth with an amalgam restoration and fistula. Tooth had minor discomfort to percussion and palpation and failed to respond to electric pulp testing. Radiographic examination revealed a radiolucent lesion on the distal aspects of the coronal portion extending toward the pulpal outline [Figure 1]a. Clinical and radiographic examination lead to a diagnosis of asymptomatic apical abscess, indicating the need for endodontic treatment.{Figure 1}

After the establishing the access cavity, clinical examination of the pulpal floor with an explorer under a magnification of 2.5x, and using magnification loupes presented the anatomy of the tooth as follows: 3 orifices in the MB root, 1 orifice in the disto- buccal root (DB), and 1 orifice in the palatal root (P). MB, DB, palatal roots had Vertucci's additional type XVIII [3-1], type I and type I configurations, respectively. [Figure 1]b. [1] Exploration of the canals with a size 10 ISO K-file revealed that the canals in MB root fused before exit as a single foramen [Figure 1]c-e. All canals were instrumented using crown-down technique under copious irrigation with 2.5% sodium hypochlorite solution and Ethylene Diamine Tetra Acetic acid. The canals were dried with paper point and dressed with calcium hydroxide and sealed with Cavit (ESPE, Seefeld, Germany). One week later, the canals were obturated with gutta-percha and sealer [Figure 1]f. The tooth was restored with full veneer crown, and it was asymptomatic thereafter at 6-month follow-up.


Clinical instrumentation of maxillary first molar tooth, especially with respect to the MB root, can be complicated. Failure to detect and treat the MB2 and MB3 canal system will result in a decreased long-term prognosis. [2] In the all canals of the maxillary first molar, the MB2 and MB3 can be the most difficult to find and negotiate in a clinical situation. Knowledge from laboratory studies is essential to provide insight into the complex root canal anatomy. [3]


This report shows that the clinician must be conscious of anatomic variations during the diagnostic and treatment phases of maxillary first molars, so that correct root-canal therapy can be performed respecting the possible challenges of pulp space anatomy. The frequency of maxillary first molars with 5 root canals especially with three MB canals is rare; however, each case should be investigated carefully, clinically and radiographically, to detect the anatomical anomaly.


1Sert S, Bayirli GS. Evaluation of the root canal configurations of the mandibular and maxillary permanent teeth by gender in the Turkish population. J Endod 2004;30:391-8.
2Wolcott J, Ishley D, Kennedy W, Johnson S, Minnich S. Clinical investigation of second mesiobuccal canals in endodontically treated and retreated maxillary molars. J Endod 2002;28:477-9.
3Cleghorn BM, Christie WH, Dong CC. Root and root canal morphology of the human permanent maxillary first molar: A literature review. J Endod 2006;32:813-21.