Assessment of the anterior loop of the mandibular canal: A study using cone-beam computed tomography
Nascimento Eduarda Helena Leandro, Pontual Maria Luiza dos Anjos, Pontual Andrea dos Anjos, Perez Danyel Elias da Cruz, Figueiroa Jose Natal, Frazao Marco Antonio Gomes, Ramos-Perez Flavia Maria de Moraes,
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( Nascimento Eduarda Helena Leandro ) - University of Campinas (UNICAMP) Piracicaba Dental School Department of Oral Diagnosis Division of Oral Radiology
( Pontual Maria Luiza dos Anjos ) - Federal University of Pernambuco School of Dentistry Department of Clinical and Preventive Dentistry
( Pontual Andrea dos Anjos ) - Federal University of Pernambuco School of Dentistry Department of Clinical and Preventive Dentistry
( Perez Danyel Elias da Cruz ) - Federal University of Pernambuco School of Dentistry Department of Clinical and Preventive Dentistry
( Figueiroa Jose Natal ) - Instituto de Medicina Integral Professor Fernando Figueira - IMIP
( Frazao Marco Antonio Gomes ) - Recife Dental School (FOR) Division of Oral Radiology
( Ramos-Perez Flavia Maria de Moraes ) - Federal University of Pernambuco School of Dentistry Department of Clinical and Preventive Dentistry
Abstract
Purpose: Sufficient area in the interforaminal region is required for dental implant placement, and the anterior loop of the mandibular canal is located within the limits of this area. The aim of this study was to evaluate the prevalence and extent of the anterior loop in a Brazilian sample population using cone-beam computed tomography (CBCT).
Materials and Methods: CBCT images from 250 patients (500 hemimandibles) obtained for various clinical indications were randomly selected and evaluated to determine the presence and length of the anterior loop. The length of the anterior loop was then compared based on gender, age, and the side of the mandible. The data were analyzed using the Pearson chi-square test and linear regression analysis.
Results: An anterior loop was identified in 41.6% of the cases, and its length ranged from 0.25 mm to 4.00 mm (mean, 1.1±0.8 mm). The loop had a greater mean length and was significantly more prevalent in males (p=0.014). No significant differences were found between the right and left sides regarding length (p=0.696) or prevalence (p=0.650).
Conclusion: In this study, a high prevalence of the anterior loop of the mandibular canal was found, and although its length varied greatly, in most cases it was less than 1 mm long. Although this is a prevalent anatomical variation, safety limits for the placement of implants in this region cannot be established before an accurate evaluation using imaging techniques in order to identify and preserve the neurovascular bundles.
키워드
Anatomic Variation; Cone-Beam Computed Tomography; Mandible
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