The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Antifibrotic effects of sulforaphane treatment on gingival elasticity reduces orthodontic relapse after rotational tooth movement in beagle dogs

  • Kim, Kyong-Nim (Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry) ;
  • Kim, Jue-Young (Department of Oral Pathology, Oral Cancer Research Institute, Yonsei University College of Dentistry) ;
  • Cha, Jung-Yul (Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry) ;
  • Choi, Sung-Hwan (Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry) ;
  • Kim, Jin (Department of Oral Pathology, Oral Cancer Research Institute, Yonsei University College of Dentistry) ;
  • Cho, Sung-Won (Division of Anatomy and Developmental Biology, Department of Oral Biology, Yonsei University College of Dentistry) ;
  • Hwang, Chung-Ju (Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry)
  • Received : 2020.03.23
  • Accepted : 2020.07.13
  • Published : 2020.11.30
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Abstract

Objective: Increased gingival elasticity has been implicated as the cause of relapse following orthodontic rotational tooth movement and approaches to reduce relapse are limited. This study aimed to investigate the effects of sulforaphane (SFN), an inhibitor of osteoclastogenesis, on gene expression in gingival fibroblasts and relapse after rotational tooth movement in beagle dogs. Methods: The lower lateral incisors of five beagle dogs were rotated. SFN or dimethylsulfoxide (DMSO) were injected into the supra-alveolar gingiva of the experimental and control group, respectively, and the effect of SFN on relapse tendency was evaluated. Changes in mRNA expression of extracellular matrix components associated with gingival elasticity in beagles were investigated by real-time polymerase chain reaction. Morphology and arrangement of collagen fibers were observed on Masson's trichrome staining of buccal gingival tissues of experimental and control teeth. Results: SFN reduced the amount and percentage of relapse of orthodontic rotation. It also decreased the gene expression of lysyl oxidase and increased the gene expression of matrix metalloproteinase (MMP) 1 and MMP 12, compared with DMSO control subjects. Histologically, collagen fiber bundles were arranged irregularly and were not well connected in the SFN-treated group, whereas the fibers extended in parallel and perpendicular directions toward the gingiva and alveolar bone in a more regular and well-ordered arrangement in the DMSO-treated group. Conclusions: Our findings demonstrated that SFN treatment may be a promising pharmacologic approach to prevent orthodontic rotational relapse caused by increased gingival elasticity of rotated teeth in beagle dogs.

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