Root and alveolar bone changes in first premolars adjacent to the traction of buccal versus palatal maxillary impacted canines

Autoři: Yalil Augusto Rodríguez-Cárdenas aff001;  Gustavo Armando Ruíz-Mora aff001;  Aron Aliaga-Del Castillo aff002;  Heraldo Luis Dias-Da Silveira aff003;  Luis Ernesto Arriola-Guillén aff004
Působiště autorů: Division of Oral and Maxillofacial Radiology, School of Dentistry, Universidad Científica del Sur, Lima, Perú aff001;  Department of Orthodontics, Bauru Dental School, University of São Paulo, Brazil aff002;  Division of Oral Radiology, Department of Surgery and Orthopedics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil aff003;  Division of Orthodontics and Division of Oral and Maxillofacial Radiology, School of Dentistry, Universidad Científica del Sur, Lima, Perú aff004
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
doi: 10.1371/journal.pone.0226267



To compare the root and alveolar bone changes in first premolars adjacent to the orthodontic traction of buccal versus palatal maxillary impacted canines (MIC).

Materials and methods

Before and after traction, cone beam tomographic computed (CBCTs) of 25 subjects with unilateral/bilateral MIC were included in this follow-up and retrospective study. Thirty-six first premolars were divided into 2 groups, buccal (n = 15) or palatal (n = 21) MIC, and the tomographic images were evaluated before and after orthodontic traction. Root changes in length and area were measured in sagittal, coronal and axial sections. Dimensions of alveolar bone were evaluated in coronal sections. Intergroup and intragroup comparisons were performed using t or Mann-Whitney U tests. Multiple linear regressions analyses were used to evaluate the influence of all predictor variables on root and alveolar bone changes (P<0.05).


Root and alveolar bone changes produced by orthodontic traction were not significant between groups. Root changes were smaller than 1 mm (length) and 2.51 mm2 (area). Alveolar bone changes between buccal and palatal MIC groups ranged from 0.13 mm to 1.69 mm Furthermore, the multivariate analysis showed no significant influence of the impaction condition (buccal or palatal) on root change. Nevertheless, some different predictor variables of the MIC influence these changes. In the alveolar bone, the maximum upper alveolar width (MUAW) is the most affected by the traction of the MIC.


Orthodontic traction of buccal vs palatal MIC produces similar resorptive and appositional root and alveolar bone changes in the adjacent first premolars, without clinical relevance.

Klíčová slova:

Alveolar bone – Computed axial tomography – Orthodontics – Retrospective studies – Teeth – Incisors


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2019 Číslo 12