Buccal alveolar bone changes following rapid maxillary expansion and fixed appliance therapy

Abstract

Objectives To assess factors that may be associated with buccal bone changes adjacent to maxillary first molars after rapid maxillary expansion (RME) and fixed appliance therapy. Materials and Methods Pretreatment (T1) and posttreatment (T2) cone-beam computed tomography scans were obtained from 45 patients treated with RME and preadjusted edgewise appliances. Buccal alveolar bone thickness was measured adjacent to the mesiobuccal root of the maxillary first molar 4 mm, 6 mm, and 8 mm apical to the cementoenamel junction, and anatomic defects were recorded. Paired and unpaired t-tests were used to compare alveolar bone thickness at T1 and T2 and to determine whether teeth with posttreatment anatomic defects had thinner initial bone. Correlation analyses were used to examine relationships between buccal alveolar bone thickness changes and amount of expansion, initial bone thickness, age at T1, postexpansion retention time, and treatment time. Results There was a statistically significant reduction in buccal alveolar bone thickness from T1 to T2. Approximately half (47.7%) of the teeth developed anatomic defects from T1 to T2. These teeth had significantly thinner buccal bone at T1. Reduction in alveolar bone thickness was correlated with only one tested variable: initial bone thickness. Conclusions RME and fixed-appliance therapy can be associated with significant reduction in buccal alveolar bone thickness and an increase in anatomic defects adjacent to the expander anchor teeth. Anchor teeth with greater initial buccal bone thickness have less reduction in buccal bone thickness and are less likely to develop posttreatment anatomic defects of buccal bone.

Changes in digital cast measurements related with two types of rapid maxillary expanders, tooth-borne versus hybrid one

“…Additionally, this study's degree of rotation differed from Ciambotti et al 41 sample, which included bonded and banded rapid palatal expansion appliances of a different design. Contrasting Montaroli et al 42 With a NiTi palatal expander, the molar rotation was 26.61° as opposed to 1.58° with an RPE, and the intermolar width was 4.76 mm as opposed to 6.26 mm. In line with other investigations, palatal inclination of the maxillary incisors was seen in both groups in the current study, this as in accordance with previous studies.…”

Compare molar’s alveolar bone width and angulation changes between cleft lip and palate and non-cleft patients following transverse correction of maxillary hypoplasia

“…Regarding non-cleft patient, significant reductions in the width of the buccal alveolar bone and a rise in anatomic abnormalities next to the expander anchor teeth have been linked to RME treatment. Anatomical abnormalities of the buccal bone that arise after treatment are less common in anchor teeth whose original buccal bone thickness was larger (21) . However, a previous study (22) displayed that after RME, the thickness of the buccal bone did not alter as the changes were not significant at (P >.05).…”

Effect of augmented corticotomy-assisted presurgical orthodontic treatment on alveolar bone fenestration and dehiscence in skeletal class III patients

“…In previous studies, many scholars have proposed that orthodontic treatment increases the incidence of bone defects, accompanied by gingival recession and periodontal attachment loss. 24 , 25 , 26 , 27 , 28 Once the root is exposed out of the alveolar bone, intact cortical plates are difficult to naturally remodel. 29 Nevertheless, there are very few previous results on the change in fenestration and dehiscence in skeletal Class III patients after POT, which is one of the main topics of this study.…”