Anne Maria Guimaraes Lessa1, Paula Paes Ferreira2, Luciana Loyola Dantas2, Marcelo de Castellucci E Barbosa3, Frederico Sampaio Neves4, Iêda Margarida Crusoé Rocha Rebello4. 1. Department of Oral Radiology, School of Dentistry, Federal University of Bahia, Avenida Araújo Pinho, 62, Canela, Salvador, Bahia, 40110-150, Brazil. anneglessa@gmail.com. 2. Department of Oral Radiology, School of Dentistry, Federal University of Bahia, Avenida Araújo Pinho, 62, Canela, Salvador, Bahia, 40110-150, Brazil. 3. Department of Orthodontics, School of Dentistry, Federal University of Bahia, Avenida Araújo Pinho, 62, Canela, Salvador, Bahia, 40110-150, Brazil. 4. Division of Oral and Maxillofacial Radiology, Department of Oral Radiology, School of Dentistry, Federal University of Bahia, Avenida Araújo Pinho, 62, Canela, Salvador, Bahia, 40110-150, Brazil.
Abstract
OBJECTIVE: The aim of this study was to correlate the absence of BB with skeletal patterns and incisor inclination using cone-beam computed tomography (CBCT). METHODS: The sample comprised CBCT images of 45 patients undergoing orthodontic treatment. BB was classified in each third of the anterior teeth as critical, slender, regular, and thick. The skeletal pattern was determined by the ANB (A point, nasion, B point) angle and the incisor inclination using the 1.NA and 1.NB measurements and the interincisal angle (1:1). RESULTS: In both analyses, the skeletal pattern of class II revealed better BB in the cervical and middle thirds than classes I and III. A higher proportion of critical BB was found in the middle thirds, and the apical third presented the best regular and thick BB conditions, mainly class I. Less BB was observed in middle and apical thirds in the upper incisors and in cervical thirds in lower incisors, mostly when they were more upright. CONCLUSIONS: Knowledge of alveolar bone height and thickness can alter the treatment plan in orthodontics. During orthodontic treatment, more attention should be paid to the lower incisors and vertical teeth because of poor BB conditions, especially in class III skeletal patterns.
OBJECTIVE: The aim of this study was to correlate the absence of BB with skeletal patterns and incisor inclination using cone-beam computed tomography (CBCT). METHODS: The sample comprised CBCT images of 45 patients undergoing orthodontic treatment. BB was classified in each third of the anterior teeth as critical, slender, regular, and thick. The skeletal pattern was determined by the ANB (A point, nasion, B point) angle and the incisor inclination using the 1.NA and 1.NB measurements and the interincisal angle (1:1). RESULTS: In both analyses, the skeletal pattern of class II revealed better BB in the cervical and middle thirds than classes I and III. A higher proportion of critical BB was found in the middle thirds, and the apical third presented the best regular and thick BB conditions, mainly class I. Less BB was observed in middle and apical thirds in the upper incisors and in cervical thirds in lower incisors, mostly when they were more upright. CONCLUSIONS: Knowledge of alveolar bone height and thickness can alter the treatment plan in orthodontics. During orthodontic treatment, more attention should be paid to the lower incisors and vertical teeth because of poor BB conditions, especially in class III skeletal patterns.