• Parichart Tangkrisanakajorn D.D.S., Grad. Dip. In Clin. Sc. (Endodontics), Diplomate, Thai Board of Endodontics

This article is a case report of conventional endodontic therapy for a left maxillary
second premolar with three root canals. The incidence of three canals at the apex of the
maxillary second premolar has been reported to be 0.3-1.0%. This anatomical variation of
root canal system can be challenging in endodontic treatment. The patient was 44 year-old
female that needed the root canal treatment on tooth # 25 with three canals. Therefore,
thorough knowledge of the root canal anatomy and its variation, careful interpretation of the
preoperative radiographs and access cavity modification are essential for enhancing
intracanal preparation, disinfection and obturation. Only then, a predictable endodontic
therapy of the three-canalled maxillary second premolar can be accomplished. In two
years recall demonstrated success both clinically and radiographically.

(CU Dent J. 2007;30:181-8)