José Adriano Costa, Marco Infante da Câmara, Luís Monteiro, Marta Relvas, Paulo Rompante, José Manuel Mendes, José Júlio Pacheco, Filomena Salazar
Funding entity:
CESPU
Period covered:
01/10/2025 – 2029
Abstract:
Introduction: The mandibular nerve has a complex path. Originating in the trigeminal ganglion, it branches into the inferior alveolar nerve in the infratemporal fossa. At the mandibular foramen, this sensory nerve enters the mandible and travels anteriorly, accompanied by the mandibular vessels, through the mandibular canal, gradually moving from a lingual plane to a buccal plane. The craniocaudal and buccolingual position and the branching pattern of the neurovascular bundle differ depending on the mandibular body. In the mental foramen, the nerve exits the mandibular body, usually after a short intraosseous course, creating the so-called anterior loop. The shape, curvature, and direction of this terminal segment are highly variable. In addition, the position of the mental foramen is also variable, but is mostly located inferior to the apex of the second premolar. Due to this variability in its path, it is difficult to predict the exact position of the nerve, thus preventing adequate preoperative planning. It is therefore very important to consider the topographical anatomy of the anterior loop during surgical procedures. Materials and Methods: Analysis of Cone Beam Computed Tomography (CBCT) scans assessing the distribution of the alveolar inferior loop patterns according to gender, age, and presence or absence of dysplastic traits. Objectives: To analyze retrospectively the prevalence, patterns and length of the alveolar inferior loop. Expected Results: to establish guidelines and protocols to avoid harm to the neurovascular bundle during clinical and surgical procedures.
Introduction: The mandibular nerve has a complex path. Originating in the trigeminal ganglion, it branches into the inferior alveolar nerve in the infratemporal fossa. At the mandibular foramen, this sensory nerve enters the mandible and travels anteriorly, accompanied by the mandibular vessels, through the mandibular canal, gradually moving from a lingual plane to a buccal plane. The craniocaudal and buccolingual position and the branching pattern of the neurovascular bundle differ depending on the mandibular body. In the mental foramen, the nerve exits the mandibular body, usually after a short intraosseous course, creating the so-called anterior loop. The shape, curvature, and direction of this terminal segment are highly variable. In addition, the position of the mental foramen is also variable, but is mostly located inferior to the apex of the second premolar. Due to this variability in its path, it is difficult to predict the exact position of the nerve, thus preventing adequate preoperative planning. It is therefore very important to consider the topographical anatomy of the anterior loop during surgical procedures. Materials and Methods: Analysis of Cone Beam Computed Tomography (CBCT) scans assessing the distribution of the alveolar inferior loop patterns according to gender, age, and presence or absence of dysplastic traits. Objectives: To analyze retrospectively the prevalence, patterns and length of the alveolar inferior loop. Expected Results: to establish guidelines and protocols to avoid harm to the neurovascular bundle during clinical and surgical procedures.