Clarissa Lopes Vieira1,2,3, Suzanni do Amaral Rodrigues Veloso4, Fernanda Ferreira Lopes5. 1. Postgraduate Dentistry Program, Federal University of Maranhão (UFMA), São Luís, MA, Brazil. cleovi@gmail.com. 2. School of Dentistry, Ceuma University (UNICEUMA), São Luís, MA, Brazil. cleovi@gmail.com. 3. , Rua Rio Anil, Quadra 07, Condomínio Mar del Plata, Casa 25, Recanto dos Vinhais, São Luís, MA, Brazil. cleovi@gmail.com. 4. Department of Morphology, Federal University Federal of Maranhão (UFMA), Av. dos Portugueses, s/n, Bacanga, São Luís, MA, CEP 65080-805, Brazil. 5. Department of Dentistry I, School of Dentistry, Federal University of Maranhão (UFMA), Av. dos Portugueses, s/n, Bacanga, São Luís, MA, CEP 65080-805, Brazil.
Abstract
PURPOSE: This study aimed at identifying the course of the mandibular canal, the presence of anterior loop and accessory mental foramen, as well as verifying the association between these variables through the analysis of cone beam computed tomography (CBCT) exams. METHODS: CBCT images were analyzed to identify the type of mandibular canal path, classified into three types: (I) catenary; (II) progressive descending; and (III) straight. In addition, the presence of anterior loop and accessory mental foramen was analyzed. The variables were summarized by measures of absolute frequency, relative, mean and standard deviation. The Chi square and Fisher's exact tests were used in the comparative analysis of the frequency distribution. The level of significance was 5%. RESULTS: The most frequent mandibular canal course was straight type (74.4%), followed by catenary (19.4%) and finally the progressive descending (6.2%). It was observed a prevalence of 10.2% for anterior loop and 7.9% for accessory mental foramen. There was no association between the presence of anterior loop (P = 0.798) and accessory mental foramen (P 0.480) with the mandibular canal course pattern, as well as no association between the anterior loop and the presence of the accessory mental foramen (P = 0.407). CONCLUSIONS: The CBCT analysis is the best methodology for the investigation and localization of mandibular anatomical variations, which provides a good image quality of the bone tissue and details of the anatomical structures, reducing the risk of injury to the lower alveolar vascular-nervous bundle and, consequently, cause paralysis and hemorrhage in the anterior region of the mandible and adjacent structures.
PURPOSE: This study aimed at identifying the course of the mandibular canal, the presence of anterior loop and accessory mental foramen, as well as verifying the association between these variables through the analysis of cone beam computed tomography (CBCT) exams. METHODS: CBCT images were analyzed to identify the type of mandibular canal path, classified into three types: (I) catenary; (II) progressive descending; and (III) straight. In addition, the presence of anterior loop and accessory mental foramen was analyzed. The variables were summarized by measures of absolute frequency, relative, mean and standard deviation. The Chi square and Fisher's exact tests were used in the comparative analysis of the frequency distribution. The level of significance was 5%. RESULTS: The most frequent mandibular canal course was straight type (74.4%), followed by catenary (19.4%) and finally the progressive descending (6.2%). It was observed a prevalence of 10.2% for anterior loop and 7.9% for accessory mental foramen. There was no association between the presence of anterior loop (P = 0.798) and accessory mental foramen (P 0.480) with the mandibular canal course pattern, as well as no association between the anterior loop and the presence of the accessory mental foramen (P = 0.407). CONCLUSIONS: The CBCT analysis is the best methodology for the investigation and localization of mandibular anatomical variations, which provides a good image quality of the bone tissue and details of the anatomical structures, reducing the risk of injury to the lower alveolar vascular-nervous bundle and, consequently, cause paralysis and hemorrhage in the anterior region of the mandible and adjacent structures.
Authors: Letícia F Haas; Kamile Dutra; André Luís Porporatti; Luis A Mezzomo; Graziela De Luca Canto; Carlos Flores-Mir; Márcio Corrêa Journal: Dentomaxillofac Radiol Date: 2015-11-18 Impact factor: 2.419
Authors: Katharina Filo; Thomas Schneider; Michael C Locher; Astrid L Kruse; Heinz-Theo Lübbers Journal: J Am Dent Assoc Date: 2014-03 Impact factor: 3.634
Authors: Altayeb Abdalla Ahmed; Rawia Mohamed Ahmed; Ahmed Jamleh; Gianrico Spagnuolo Journal: Int J Environ Res Public Health Date: 2021-03-24 Impact factor: 3.390