Relationship between alveolar-bone morphology at the mandibular incisors and their inclination in adults with low-angle, skeletal class III malocclusion—A retrospective CBCT study

Abstract

Objective To quantitatively study the effect of the labial inclination of the mandibular central incisors on the surrounding cortical and cancellous-bone morphology among patients with low-angle, skeletal class III malocclusion, by using cone-beam computed-tomography (CBCT) imaging. Materials and methods The CBCT images of 60 patients with low-angle, skeletal class III malocclusion were divided into lingual-inclination, upright, and labial-inclination groups. The height of the alveolar bone and the thickness and area of the cortical, cancellous, and total alveolar bone were measured separately on each side of the mandibular central incisors. Results The thickness of the labial cortical bone from 6 mm below the cementoenamel junction (CEJ) to the root apex; the thickness of the labial cancellous bone at the root apex; the total thickness of the alveolar bone at the root apex; the area of labial cortical bone; the total area of labial alveolar bone; and the height of the labial alveolar bone were highest in the labial-inclination group (all P<0.05). All these variables were positively correlated with the labial inclination of the mandibular central incisors (all P<0.05). There were no statistical differences between the groups for any of the measurements on the lingual side of the teeth (P>0.05). Conclusion The morphology of the alveolar bone on the labial but not the lingual side of the mandibular central incisors was statistically significantly correlated with the labial inclination of those teeth in patients with low-angle, skeletal class III malocclusion.

Three-dimensional evaluation of alveolar bone and pharyngeal airway dimensions after mandibular dentition distalization in patients with Class III malocclusion: a retrospective study

“…Especially in patients with Class III malocclusion, the alveolar bone of mandibular anterior teeth is thinner than that in patients with other kinds of malocclusions [ 18 ]. Hence, the teeth movement and bone remodeling of Class III patients are restricted by the anatomical boundary [ 18 , 19 ]. Before the orthodontic treatment, periodontal problems should be carefully assessed during clinical examination.…”

retrospective study on the relationship between alveolar-bone morphology at the mandibular incisors and their inclination in adults with low-angle, skeletal class III malocclusion

“…Alveolar bone abnormalities such as fenestration and dehiscence are examples of inadequate bone boundary conditions found out while conducting qualitative assessment of the morphology of the alveolar bone present around the teeth [6]. In a study, the prevalence of fenestration and dehiscence was calculated to be 12% among maxillary central incisors prior to the starting of the orthodontic treatment irrespective of absence of any attachment loss [7]. The optimum locality for the maximum root-alveolar bone connection has been seen to be the alveolar bone centre as per the literature search.…”