Root Anatomy and Canal Configuration of Maxillary Premolars: A Cone-beam Computed Tomography Study

The aim of the study was to determine number and anatomical configuration roots root canals maxillary first second premolars using cone-beam computed tomography scans. n273 CBCT scans were evaluated, obtaining a sample 592 premolars. Root canal anatomy categorized Ahmed´s classification. Data analyzed Pearson’s Chi-squared test. Two present on 157 premolars, one in 132 three 17. Second presented 266 samples two 20; no roots. Eight different configurations found; most frequent 2MP B1 P1 (51,3 %) 1MP1 (63.6 morphology found Chilean population analysis internal revealed highly variable distribution canals, generally low medium complexity, similar what is other ethnic groups.