Abstract:
This study aimed to evaluate, by means of computed tomography (CT), the
amount of reduction in alveolar bone thickness in the buccal and palatal of maxillary
right central incisor in the permanent dentition of patients before and after orthodontic
retraction and the degree of dependence the nature of the malocclusion, with some
cephalometric variables and the type of treatment. Patients with low bone thickness
were selected after examination of the bone thickness verified by cephalometry, and
roots more prominent in the examination of the plaster model. We evaluated 18
patients with permanent dentition of both sexes, aged between 9 and 50 years. This
sample was divided into three groups: G1 group of 06 patients who underwent CT at
T1 (At the beginning of orthodontic treatment) and T2 (after 18 months of orthodontic
treatment) extracted 14:24 retraction orthodontic completed G2-06 patients CT
performed at T1 (At the beginning of orthodontic treatment) and T2 (after 18 months
of orthodontic treatment) taken from 15:25 to complete orthodontic retraction and G3-
06 patients who underwent CT at T1 (At the beginning of orthodontic treatment) and
T2 (after 18 months of orthodontic treatment) without extractions. The study excluded
patients: patients with systemic diseases that alter bone metabolism, chronic users of
drugs based on corticosteroids, patients with absence of upper anterior teeth and
patients who have suffered trauma in the region of the maxillary anterior teeth with
fracture or dislocation dental, or patients with prosthetic crown in upper right central
incisor. The results revealed that patients from G3 were less protruding in T1 and
became the most protruding in T2, compared with G1 and G2, who underwent
extraction for T2, the thickness of alveolar bone on the buccal cervical incisor was
larger in G1 and lowest in G3. The incidence of external root resorption showed no
statistically significant differences between groups, but showed a greater tendency in
group 1, where extractions were performed on 14 and 24.
