Prevalence and morphometric analysis of retromolar canals and foramina: a cone-beam computed tomography study

Abstract

Background: The retromolar region of the mandible is an anatomically complex area that harbors important neurovascular structures, including the retromolar canal (RMC) and retromolar foramen (RMF). Understanding the prevalence and characteristics of these anatomical variations is crucial for safe and effective dental and maxillofacial procedures. This study aimed to comprehensively investigate RMCs and RMFs using cone-beam computed tomography (CBCT) imaging. Methods: This study analyzed CBCT scans of 160 subjects (80 males, 80 females) aged 18 years and above. The presence and morphology of RMCs were assessed, and their spatial relationships with adjacent structures were measured. Statistical analysis using the ANOVA and chi-square tests to evaluate the associations between RMC characteristics and demographic factors yielded no significant results. Results: RMCs were present in 37 out of 160 subjects (23.1%). The most prevalent type of RMC was the curved Type B (62.2%), followed by Type A (29.7%) and Type C (8.1%). RMFs were predominantly located in a buccal position relative to the mandibular third molar (86.5%). The study also provided comprehensive morphometric data on the retromolar canals (RMCs) and foramina (RMFs) observed in the study population. Key measurements included the distance from the buccal and lingual cortices to the RMCs, the distance from the mandibular foramen to the RMC origin, and the distances from the RMF to the mandibular canal and adjacent molars. These detailed spatial relationships were analyzed across different age groups and between genders. The data revealed trends, such as decreasing buccal distances and increasing lingual distances with advancing age. This morphometric information is valuable for clinicians when planning procedures in the retromolar region, as it can guide preoperative assessment and help mitigate the risk of neurovascular complications associated with the variable anatomy of RMCs and RMFs. Conclusion: This comprehensive CBCT study provides valuable insights into the prevalence, morphology, and spatial relationships of RMCs and RMFs. The variable anatomical features of these structures can have significant clinical implications for various dental and maxillofacial procedures. The data presented in this study can serve as a reference for clinicians to enhance preoperative assessment and improve the safety and efficacy of interventions in the retromolar region.