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#MCQ 12 - Which of the following tooth has the highest endodontic failure rate?

#MCQ 12 - Which of the following tooth has the highest endodontic failure rate?
A. Maxillary First Molar
B. Maxillary First Premolar
C. Mandibular First Molar
D. Mandibular Second Premolar

Answer: A. Maxillary First Molar

The pulp chamber of the maxillary first molar is the largest in the dental arch.

The maxillary first molars are three rooted, two buccal and one palatal. The tooth usually has four root canals, the additional canal being located in the mesiobuccal root. The pulp chamber floor has a quadrilateral shape, although it is sometimes described as triangular.  All the canal orifices lie mesial to the oblique ridge which makes it possible to preserve it (oblique ridge) during access preparation.

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