Root-crown Ratio of Maxillary and Mandibular Anterior Permanent Teeth in Yemeni Adults using CBCT.

Aim: To assess the root-crown ratio (RCR) of maxillary and mandibular anterior permanent teeth from cone-beam computed tomography (CBCT) acquired from a sample of Yemeni adults.

Materials and methods: This was a retrospective radiographic observational cross-sectional study. The study included 233 CBCTs. Root length, crown length, and RCR of all anterior teeth were measured using Ez-3Di software. Factors considered for correlation included gender differences, skeletal classifications (class I, II, and III), overjet (OJ), and overbite (OB). The data were entered and analyzed using the Statistical Package for the Social Sciences software. Significance was set at a value of p < 0.05.

Results: Mean RCR of maxillary and mandibular anterior teeth ranged between 1.2 and 1.3 for central incisors, 1.3 and 1.4 for lateral incisors, and 1.5 and 1.6 for canines. The length of roots and crowns was generally greater in males, except for the mean crown length of the left mandibular central incisor. Class III participants exhibited the longest root length for maxillary and mandibular canines, 15.75 and 14.7 mm, respectively, compared with class I and II participants. Participants with increased OJ (>4 mm) showed the lowest root and crown lengths in all canines and lateral incisors while displaying the highest root length in all central incisors. However, no statistically significant variances were observed in root length and the RCR (p > 0.05). Those with a deep bite had the longest roots for maxillary lateral and central incisors and the shortest roots for maxillary canines. In contrast, participants with an open bite displayed the opposite measurements.

Conclusions: Gender differences in RCR were insignificant except for the mandibular right central incisor. No significant differences were observed among the three skeletal classes in all study parameters. Furthermore, RCR variations based on OJ and OB were not statistically significant, except for the mandibular left lateral incisor in relation to OB.

Clinical significance: Understanding RCR variations supports clinicians in treatment planning, especially in anchorage selection, force application, and predicting treatment outcomes. This knowledge is important for minimizing potential complications and improving treatment effectiveness in various orthodontic cases. How to cite this article: Alhaidary SA, Al-Haddad KA, Al-Harazi GA, et al. Root-crown Ratio of Maxillary and Mandibular Anterior Permanent Teeth in Yemeni Adults using CBCT. J Contemp Dent Pract 2024;25(12):1118-1126.