Endodontic therapy is a routinely practised clinical procedure with few reported complications.

Furcation perforation often leads to a very perplexing and frustrating problem in endodontic therapy, often have a doubtful prognosis.

Objective To study the shape and location of root canal orifice in maxillary first permanent molar and provide a morphological basis for locating canal orifice in endodontic therapy.