Three-dimensional Analysis of Maxillary First Molar Mesiobuccal Root Canal Configuration and Curvature Using Micro–Computed Tomography

By Park,J, Lee J, Ha B, Choi J, Perinpanayagam H, Busan S.

Date: 10/2009
Journal: JOE


•Purpose: to study the MB canal configuration in maxillary 1st molar using micro CT, identify number of canals and presence of curvature

•N= 46 intact maxillary  1st molars.


•External surfacecleaned using ultrasonic scaler and 5.25% NaOCl.

•Teeth scanned using micro CT. 502 image / tooth were obtained and used to reconstruct a 3D model.

•Classification used: Weine I,II,III and IV.1  Type V based on Yoshioka et al.’s system.2

•In order to measure the canal’s curvature they need to  mathematically define shape and curvature .

Most highlighted Results: 

•72% of the MB roots had multiple canals, 65% of them had 2 canals (mostly type III canal configuration (37%)).

•7% had 3 canals.

•Average canal length of: MB1 = 9.8 mm. MB2=9.2 mm.

•Curvature for both MB1 and MB2 from large to least: apical, coronal, middle. With much more exaggerated curves in all trisections in MB2.

•50% of MB2 canals had calcified segment, mostly in the coronal third (39%) with an average length of 1.1 mm.

Clinical significance:

high incidence of  calcification in MB2  and its abrupt curvatures. Aid in negotiating MB2.