2159. If the pulp of a single rooted tooth canal were triangular in cross section with the base of the triangle located facially and the apex lingually with a longer mesial side than distal side; the tooth most likely is_____________? September 27, 2025 by Admin A. Maxillary central incisor B. Maxillary second premolar C. Mandibular lateral incisor D. Mandibular central incisor ✅ The correct answer is option A. Maxillary central incisor.