Topographic analysis of the mandibular symphysis in a normal occlusion population using cone-beam computed tomography

Abstract

Abstract. At present, the relationship between the morphological characteristics of the sympheseal region and occlusion has not been well documented. The aim of the present study was to investigate the following, using cone-beam computed tomography (CBCT): Interforaminal distance, the anterior loop, labial bone thickness at the tooth apex, cortical bone thickness, and the basal bone height from the apex of the tooth to the base of the mandible. Three-dimensional CBCT was performed on 20 normal occlusion subjects (9 males and 11 females; mean age=21.9±3.0 years); the mean interforaminal distance was 53.1±3.6 mm, with 85% of the participants demonstrating a mental foramen located below the second premolars on both sides. The mean anterior loop was 1.9±0.8 mm, the mean horizontal distance value was 4.5±1.3 mm, and the mean cortical bone thickness value was 2.3±0.5 mm. An increasing tendency for cortical bone thickness was seen from the central incisor to the second premolar. The mean vertical distance value was 20.3±3.1 mm. Decreasing tendency of vertical distance was seen from the central incisor to the second premolar. Furthermore, the width (mental foramina of both sides and their anterior loops), height (teeth apices and the inferior border of the mandible), depth (cortical bone thickness of the symphysis), and safety margins for vital anatomical structures (anterior loop, tooth apex, and inferior border of mandible) should be taken into account prior to symphyseal block-bone harvesting. The results of the present study suggested that a pre-operative evaluation with CBCT may be useful for diagnosis and treatment planning, and for minimizing complications during block-bone graft.

Analysis of Alveolar Bone Morphology of the Maxillary Central and Lateral Incisors with Normal Occlusion

“…Cone-beam computed tomography’s (CBCT) three-dimensional culture allows for convenient evaluation of the quality and quantity of bone [1,2]. CBCT can produce accurate and high-resolution multiple planar reformatted images with the exposure of relatively low radiation [3].…”

“…CBCT can produce accurate and high-resolution multiple planar reformatted images with the exposure of relatively low radiation [3]. CBCT can be used as an aid during diagnosis and treatment planning, and it can minimize complications during dental operations, including tooth extraction and dental implantation [1,4]. Moreover, CBCT can be applied for the analysis of distance from anatomical structures [2].…”

Prevalence and extension of the anterior loop of the mental nerve in different populations and CBCT imaging settings: A systematic review and meta-analysis

“…Thirteen studies used a small FOV, 12 24 25 26 27 28 29 30 31 32 33 34 35 15 studies used a medium FOV, 14 23 26 36 37 38 39 40 41 42 43 44 45 46 47 and 16 studies used a large FOV. 1 11 21 22 44 46 48 49 50 51 52 53 54 55 56 Moreover, 30 studies used a voxel size of less than 0.3 mm, 11 12 13 14 22 24 25 28 29 30 31 33 34 35 39 40 41 42 44 45 47 49 50 51 55 57 58 59 60 61 whereas 26 studies used voxels that were 0.3 mm or larger. 1 10 14 21 23 26 27 …”

“… 1 11 21 22 44 46 48 49 50 51 52 53 54 55 56 Moreover, 30 studies used a voxel size of less than 0.3 mm, 11 12 13 14 22 24 25 28 29 30 31 33 34 35 39 40 41 42 44 45 47 49 50 51 55 57 58 59 60 61 whereas 26 studies used voxels that were 0.3 mm or larger. 1 10 14 21 23 26 27 28 36 37 40 41 42 45 46 47 50 51 52 53 54 58 62 63 64 65 …”

Hueso Cortical en Sínfisis Mandibular de Sujetos de Clase I

“…Flanagan (2015), estudió el tiempo del efecto anestésico y su relación con el hueso cortical, indicando que sujetos con tamaño de cortical promedio de 2,12 mm presentaban sensibilidad al estimulo eléctrico luego de 5 min de aplicado la anestesia infiltrativa local mientras que sujetos con promedios de 2,0 mm no presentaban ningún tipo de sensibilidad en el mismo tiempo de evaluación, concluyendo que el tamaño de cortical era uno de los motivos para mayor o menor tiempo de acción del anestésico local. Lee et al (2015), realizaron una interesante investigación donde observaron sujetos con oclusión dentaria sin anomalías de posición; identificaron que a nivel del incisivo central el tamaño de cortical bucal fue de 1,8 mm; a nivel de incisivo lateral, 2,0 mm y a nivel del canino, 2,3 mm. Nuestros resultados no mostraron ningún tamaño de cortical bucal superior a 2 mm; esta condición se puede asociar a diferencias en calidad de imagen o a la composición poblacional.…”