4.5 Article

Experimental model of tooth movement in mice: A standardized protocol for studying bone remodeling under compression and tensile strains

Journal

JOURNAL OF BIOMECHANICS
Volume 45, Issue 16, Pages 2729-2735

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.jbiomech.2012.09.006

Keywords

Orthodontic tooth movement; Bone remodeling; Cytokines; Proteolytic enzymes

Funding

  1. Fundacao de Amparo a Pesquisas do Estado de Minas Gerais (FAPEMIG, Brazil)
  2. Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
  3. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq, Brazil)

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During orthodontic tooth movement (OTM), alveolar bone is resorbed by osteoclasts in compression sites (CS) and is deposited by osteoblasts in tension sites (TS). The aim of this study was to develop a standardized OTM protocol in mice and to investigate the expression of bone resorption and deposition markers in CS and TS. An orthodontic appliance was placed in C57BL6/J mice. To define the ideal orthodontic force, the molars of the mice were subjected to forces of 0.1 N, 0.25 N, 0.35 N and 0.5 N. The expression of mediators that are involved in bone remodeling at CS and TS was analyzed using a Real-Time PCR. The data revealed that a force of 0.35 N promoted optimal OTM and osteoclast recruitment without root resorption. The levels of TNF-alpha, RANKL, MMP13 and OPG were all altered in CS and TS. Whereas TNF-a and Cathepsin K exhibited elevated levels in CS. RUNX2 and OCN levels were higher in TS. Our results suggest that 0.35 N is the ideal force for OTM in mice and has no side effects. Moreover, the expression of bone remodeling markers differed between the compression and the tension areas, potentially explaining the distinct cellular migration and differentiation patterns in each of these sites. (C) 2012 Elsevier Ltd. All rights reserved.

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