Abstract

Introduction: Radiographic tooth length is useful in evaluating the dental treatment effects. CBCT images are considered accurate and reliable in terms of linear measurements of tooth morphology.

Methods: This study design was a retrospective study. Total 108 CBCT images were taken in the Department of Radiology, University Dental Hospital, Mongolian National University Medical Sciences (MNUMS), between 2014 and 2021. We collected all images according to the inclusion and exclusion criteria. Data analyzed using IBM SPSS version 26 software. The study was approved by the Research Ethics Committee of Mongolian National University of Medical Sciences on January 07, 2020 (No. 2020/3-01/20).

Results and conclusion: the entire length of the permanent central incisor in the maxilla on the CBCT image 21.08±1.92 mm, crown length 9.76±0.95 mm, root length 11.32±1.76 mm and R/C ratio was 1.16. In the mandible 18.82±1.33 mm, 7.82±0.82 mm, 10.98±1.09 mm and 1.4, respectively (p<0.01) For the permanent canine in the maxilla the entire length 24.19±2.09 mm, crown length 8.81±0.87 mm, root length 15.38±1.91 mm and R/C ratio was 1.75. In the mandible 23.18±2.03 mm, 8.63±0.91 mm, 14.54±1.72 mm and 1.68, respectively (p<0.01) The entire length of the permanent first molar in the maxilla 17.43±1.62 mm, crown length 5.82±0.52 mm, root length 11.60±1.38 mm and R/C ratio was 1.99. In the mandible 19.30±1.41 mm, 6.30±0.52 mm, 12.99±1.24 mm and 2.06, respectively (p<0.01) There were a weak, negative correlation significantly between the root length of maxillary permanent teeth and gender, age.