Purpose: The mandibular anatomical structures including mental foramen, accessory mental foramina, anterior loop were measured and analyzed by cone-beam CT (cone-beam computed tomography, CBCT) , in order to provide some information during surgical procedures in interforaminal regions.
Methods: Two hundred and eighty-seven Chinese Han patients who visited Stomatological Department of Xiangya Hospital were included in this study. Patients were scanned by cone-beam computed tomography, and the information of interforaminal region was collected from the images. SPSS17.0 software package was used for statistical analysis.
Results: The mental foramen was usually apical to the second premolar or between the premolars（60.80% and 30.14%, respectively). The accessory mental foramina was observed in 4.88% of the mandibles, most of which were located under the second premolar, superiorly and distally to the mental foramen. The anterior loop was identified in 89.20% of cases with the mean length being (1.99±1.39) mm. The distance from the apex of the second mandibular premolar to the anterior loop or the inferior alveolar nerve was (5.21±2.50) mm.
Conclusions: Accessory mental foramina is present in some mandibles. The anterior loop is highly prevalent in Chinese Han people, and its length is highly variable.
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