Investigation of Root-crown Ratio of Upper Incisors in a Group of Turkish Adolescent

Aims: The aim of this study was to evaluate of the root-crown ratio in upper incisors using panoramic radiographs in a group of Turkish Adolescent.

Study Design: Various measurements were made on panoramic radiographs in the study.

Place and Duration of Study: Ondokuz Mayıs University, Faculty of Dentistry, Department of Pedodontics between June 11, 2019 and December 11, 2020.

Methodology: In this study, the crown heights and root lengths of the upper incisor teeth were measured in digital panoramic radiographs of 568 Adolescent [284 girls, 284 boys] aged between 13-14 years. No patients with any systemic disease or syndrome, filling or caries in their upper incisor teeth were included. Measurements were made under dim light using Image J program. Crown heights and root lengths were measured using modified Lind's method. One-Way Analysis of Variance and Tukey multiple comparison test were used in the analysis of the data.

Results: No statistical difference was detected between root lengths of the teeth [p=0.13]. Crown heights of central teeth were longer than lateral teeth [p<0.001]. The highest root-crown ratios were determined in lateral teeth [p<0.001]. Similar root-crown ratios were found in symmetrical teeth.

Conclusion: This study may provide convenience to dentists when the root length of teeth in need of root canal treatment cannot be determined by radiographs or in cases where digital root length measuring devices are not available. It can also guide the estimation of crown height and root lengths of upper incisors in Turkish Adolescent.