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Prevalence and morphometry of mental nerve anterior loop and incisive canal with bone concavity: A radioanatomic
Safiye Pelin Sahiner1, Gozde Serindere1
1Ordu University, Faculty of Dentistry, Department of Dentomaxillofacial Radiology, Ordu, Türkiye.
Objective:
This study evaluates the prevalence and morphology of the mental nerve anterior loop (AL) and incisive canal (IC) using cone-beam computed tomography (CBCT), and their relationship with mandibular bone concavity.
Study Design:
The CBCT assessment involved measuring the length of the AL, the length and diameter of the IC, together with their distances from the alveolar crest, inferior border, and buccal/lingual cortical plates. Lingual concavity was categorized into four patterns: Type I (lingual), Type II (lingually inclined), Type III (labiolingual expansion), and Type IV (buccal). Data analysis was carried out using SPSS version 29.0.
Results:
The anterior loop (AL) was observed unilaterally in 52.7% and bilaterally in 29.3% of cases, with mean lengths of 5.47 mm (right) and 5.68 mm (left). The IC was observed in 86.1% of patients, measuring 7.94 mm (right) and 7.67 mm (left) in length and ∼1.5 mm in diameter. Age weakly correlated with some canal measurements; males had slightly larger canal lengths and alveolar crest distances. Concavity type did not significantly affect loop or canal prevalence, though Type III tended to be larger.
Conclusions:
Mandibular anatomical variations differ by gender, with males showing greater measurements, particularly in cortical distances. Concavity type affects dimensions, with Type III showing the largest values. These findings emphasize the need to consider gender and concavity morphology in preoperative assessment.
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