International dental journal · 2025
CBCT-Based Multilevel Analysis of Canal Morphology and Predictors of Variation in Mandibular Incisors of Thai Population.
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Pukkawanna Purin, Ratisoontorn Chootima, Charoenlarp Pornkawee, Sinsareekul Chanakarn
Аннотация
INTRODUCTION AND AIMS: This study aimed to identify predictive factors associated with morphological variations in the root canal anatomy of mandibular incisors, as well as to assess the in vivo prevalence of such variations in a Thai subpopulation using cone-beam computed tomography (CBCT).
METHODS: A total of 760 CBCT scans, including 1520 mandibular central incisors (MCIs) and 1520 mandibular lateral incisors (MLIs), were examined. Demographic data (age and gender) and anatomical measurements (root length and root width at the cementoenamel junction [CEJ]) were collected. Descriptive statistics, including relative frequencies (percentages) of root canal configuration types and the number of roots and root canals, were reported. Additionally, teeth were categorised based on the presence or absence of an additional lingual canal. Univariate and multivariate multilevel logistic regression analyses were conducted to determine associations, and receiver operating characteristic (ROC) curve analysis was used to assess the predictive accuracy of significant variables. A significant threshold of 5% was applied for statistical analyses.
RESULTS: All mandibular incisors primarily exhibited a single root canal configuration. However, the second canal was present in 17% of mandibular central incisors and 36% of mandibular lateral incisors. Bilateral symmetry in root canal morphology was observed in more than 86% of cases. Among all variables, only the root width ratio at the CEJ (greater than 1.6 mm) showed a significant association with the presence of a lingual canal.
CONCLUSION: These findings suggest that the CEJ root width ratio is a reliable anatomical predictor of lingual canal presence in mandibular incisors.
CLINICAL RELEVANCE: This study demonstrates that a root width ratio at the CEJ greater than 1.6 mm is significantly associated with the presence of a lingual canal in mandibular incisors. Clinicians should consider this anatomical parameter when planning endodontic procedure.
METHODS: A total of 760 CBCT scans, including 1520 mandibular central incisors (MCIs) and 1520 mandibular lateral incisors (MLIs), were examined. Demographic data (age and gender) and anatomical measurements (root length and root width at the cementoenamel junction [CEJ]) were collected. Descriptive statistics, including relative frequencies (percentages) of root canal configuration types and the number of roots and root canals, were reported. Additionally, teeth were categorised based on the presence or absence of an additional lingual canal. Univariate and multivariate multilevel logistic regression analyses were conducted to determine associations, and receiver operating characteristic (ROC) curve analysis was used to assess the predictive accuracy of significant variables. A significant threshold of 5% was applied for statistical analyses.
RESULTS: All mandibular incisors primarily exhibited a single root canal configuration. However, the second canal was present in 17% of mandibular central incisors and 36% of mandibular lateral incisors. Bilateral symmetry in root canal morphology was observed in more than 86% of cases. Among all variables, only the root width ratio at the CEJ (greater than 1.6 mm) showed a significant association with the presence of a lingual canal.
CONCLUSION: These findings suggest that the CEJ root width ratio is a reliable anatomical predictor of lingual canal presence in mandibular incisors.
CLINICAL RELEVANCE: This study demonstrates that a root width ratio at the CEJ greater than 1.6 mm is significantly associated with the presence of a lingual canal in mandibular incisors. Clinicians should consider this anatomical parameter when planning endodontic procedure.