Directions of mandibular canal displacement in ameloblastoma: A computed tomography mirrored-method analysis
Evangelista Karine, Cardoso Lincoln, Toledo Italo, Gasperini Giovanni, Valladares-Neto Jose, Cevidanes Lucia Helena Soares, de Oliveira Ruellas Antonio Carlos, Silva Maria Alves Garcia Santos,
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( Evangelista Karine ) - Federal University of Goias School of Dentistry Department of Orthodontics
( Cardoso Lincoln ) - Federal University of Goias University Clinical Hospital
( Toledo Italo ) - Federal University of Goias University Clinical Hospital
( Gasperini Giovanni ) - Federal University of Goias University Clinical Hospital
( Valladares-Neto Jose ) - Federal University of Goias School of Dentistry Department of Orthodontics
( Cevidanes Lucia Helena Soares ) - University of Michigan School of Dentistry Department of Orthodontics and Pediatric Dentistry
( de Oliveira Ruellas Antonio Carlos ) - University of Michigan School of Dentistry Department of Orthodontics and Pediatric Dentistry
( Silva Maria Alves Garcia Santos ) - Federal University of Goias School of Dentistry Department of Stomatologic Sciences
Abstract
Purpose: This study was performed to investigate mandibular canal displacement in patients with ameloblastoma using a 3-dimensional mirrored-model analysis.
Materials and Methods: The sample consisted of computed tomographic scans of patients with ameloblastoma (n=10) and healthy controls (n=20). The amount of mandibular canal asymmetry was recorded as a continuous variable, while the buccolingual (yaw) and supero-inferior (pitch) directions of displacement were classified as categorical variables. The t-test for independent samples and the Fisher exact test were used to compare groups in terms of differences between sides and the presence of asymmetric inclinations, respectively (P<0.05).
Results: The length of the mandibular canal was similar on both sides in both groups. The ameloblastoma group presented more lateral (2.40±4.16 mm) and inferior (?1.97±1.92 mm) positions of the mental foramen, and a more buccal (1.09±2.75 mm) position of the middle canal point on the lesion side. Displacement of the mandibular canal tended to be found in the anterior region in patients with ameloblastoma, occurring toward the buccal and inferior directions in 60% and 70% of ameloblastoma patients, respectively.
Conclusion: Mandibular canal displacement due to ameloblastoma could be detected by this superimposed mirrored method, and displacement was more prevalent toward the inferior and buccal directions. This displacement affected the mental foramen position, but did not lead to a change in the length of the mandibular canal. The control group presented no mandibular canal displacement.
키워드
Ameloblastoma; Mandibular Nerve; Facial Asymmetry; Multidetector Computed Tomography; Cone-Beam Computed Tomography
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