Micro-CT evaluation of maxillary first molars: interorifice distances and internal anatomy of the mesiobuccal root

This study aimed to describe the morphometric relationship of root canal orifices on pulp floor in presence/absence mesiobuccal second (MB2) maxillary first molars and other aspects its internal anatomy. Sixty-two were scanned by micro-CT. The presence MB2 was verified. distance between center points MB1, MB2, distobuccal (DB), palatal (P) measured (MB1-MB2, MB1-DB, MB2-DB, MB1-P, DB-P). MB1-P DB-P ratio calculated. distances anatomic apex MB1 apical foramina measured. length band-shaped isthmus also Student's t-test applied verify association an canal, interorifice distances, (? = 5%). present 43 roots (69.35%). Statistics showed significant differences when for largest (p < 0.05) higher values 0.05). A detected 25.8% MB roots. mean from foramen ranged 1.74 canals 1.42 canals. Canal orifice may predict There a high incidence isthmus, accessory canals, delta critical zone molars.