Korean J Orthod.  2018 Jan;48(1):57-62. 10.4041/kjod.2018.48.1.57.

Osseous outgrowth on the buccal maxilla associated with piezosurgery-assisted en-masse retraction: A case series

Affiliations
  • 1Department of Orthodontics, Faculty of Dentistry, BaÅŸkent University, Ankara, Turkey. iremtuncher@gmail.com
  • 2Department of Periodontology, Faculty of Dentistry, BaÅŸkent University, Ankara, Turkey.
  • 3Department of Applied Oral Sciences, Forsyth Institute, Cambridge, MA, USA.

Abstract

Piezoelectric surgery is a novel surgical approach used in orthodontic treatment for rapid tooth movement. This paper presents a case series wherein osseous outgrowths were observed in response to piezosurgery-assisted en-masse retraction. Sixteen patients requiring upper premolar extractions were treated with miniscrew-supported en-masse retraction and received minimally invasive decortication via piezosurgery. Computed tomography (CT) of the maxillary anterior region was performed to investigate the nature of the outgrowths. In 8 of the 16 patients, hemispheric or disc-shaped osseous outgrowths were observed on the sites where piezosurgery was performed during retraction. CT images revealed that these outgrowths were alveolar bone. This case series presents a previously unreported osseous response to piezosurgery-assisted tooth movement during orthodontic treatment. The response is mostly transient and is observed in 50% of the treated patients, suggesting a bone turnover that can be assessed clinically and radiographically.

Keyword

Piezosurgery; Bone biology; Osseous outgrowths; Computed tomography

MeSH Terms

Bicuspid
Bone Remodeling
Humans
Maxilla*
Piezosurgery
Tooth Movement

Figure

  • Figure 1 A, Computed tomography (CT) image (axial slice) from the maxillary anterior region acquired from Patient 1 at the beginning of retraction. B, Osseous outgrowths at the end of retraction. C, CT image from the maxillary anterior region acquired at the end of retraction. D, Significant regression at the end of treatment.

  • Figure 2 A, Computed tomography (CT) image (axial slice) from the maxillary anterior region acquired from Patient 2 at the beginning of retraction. B, Two osseous outgrowths: a bigger one between the right central and lateral incisors, and a smaller one between the right lateral incisor and canine. C, CT image from the maxillary anterior region acquired at the end of retraction. D, Osseous outgrowths at the end of treatment.

  • Figure 3 The three-dimensional superimposition of computed tomography images acquired at the beginning and end of retraction. The image in brown is the one acquired at the beginning of retraction, and the image in green is the one acquired at the end of retraction.

  • Figure 4 A, Computed tomography (CT) image (axial slice) from the maxillary anterior region acquired from Patient 3 at the beginning of retraction. B, Extensive osseous outgrowths on the buccal maxilla during retraction. C, CT image from the maxillary anterior region acquired at the end of retraction. D, Osseous outgrowths 9 months after debonding.


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