Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2018 Sep;88(5):632-637.
doi: 10.2319/103117-736.1. Epub 2018 May 1.

Effects of different force magnitudes on corticotomy-assisted orthodontic tooth movement in rats

Kriangkrai Kraiwattanapong, Bancha Samruajbenjakun

Effects of different force magnitudes on corticotomy-assisted orthodontic tooth movement in rats

Kriangkrai Kraiwattanapong et al. Angle Orthod. 2018 Sep.

Abstract

Objectives: To investigate the effects of light and heavy forces with corticotomy on tooth movement rate, alveolar bone response, and root resorption in a rat model.

Materials and methods: The right and left sides of 40 male Wistar rats were randomly assigned using the split-mouth design to two groups: light force with corticotomy (LF) and heavy force with corticotomy (HF). Tooth movement was performed on the maxillary first molars using a nickel-titanium closed-coil spring delivering either 10 g (light force) or 50 g (heavy force). Tooth movement and alveolar bone response were assessed by micro-computed tomography (micro-CT) at day 0 as the baseline and on days 7, 14, 21, and 28. Root resorption was examined by histomorphometric analysis at day 28.

Results: Micro-CT analysis showed a significantly greater tooth movement in the HF group at days 7 and 14 but no difference in bone volume fraction at any of the observed periods. Histomorphometric analysis found no significant difference in root resorption between the LF and HF groups at day 28.

Conclusions: Heavy force with corticotomy increased tooth movement at days 7 and 14 but did not show any difference in alveolar bone change or root resorption.

Keywords: Corticotomy; Micro-CT; Root resorption.

PubMed Disclaimer

Figures

Figure 1.
Figure 1.
Schematic figure of tooth movement and corticotomy area.
Figure 2.
Figure 2.
(A) Tooth movement measurement using micro-CT. (B) ROI for alveolar bone analysis. M indicates mesial root; Mid-B, mid-buccal; MP, mesiopalatal; DB, distobuccal; and DP, distopalatal. (C) ROI in sagittal view.
Figure 3.
Figure 3.
Histomorphometric analysis on distobuccal root.
Figure 4.
Figure 4.
(A) Cumulative tooth movement of LF and HF groups. (B) Rate of tooth movement of LF and HF groups. *P < .05.
Figure 5.
Figure 5.
Comparison between LF and HF groups. (A) BV/TV. (B) Root resorption.
Figure 6.
Figure 6.
Root resorption evaluation. (A) Distobuccal root of LF. (B) Distopalatal root of LF. (C) Distobuccal root of HF. (D) Distopalatal root of HF. Arrows indicate the resorptions present on the mesial side.
See this image and copyright information in PMC

References

    1. Nakano T, Hotokezaka H, Hashimoto M, et al. Effects of different types of tooth movement and force magnitudes on the amount of tooth movement and root resorption in rats. Angle Orthod. 2014;84:1079–1085. - PMC - PubMed
    1. Gonzales C, Hotokezaka H, Yoshimatsu M, Yozgatian JH, Darendeliler MA, Yoshida N. Force magnitude and duration effects on amount of tooth movement and root resorption in the rat molar. Angle Orthod. 2008;78:502–509. - PubMed
    1. Verna C, Dalstra M, Melsen B. Bone turnover rate in rats does not influence root resorption induced by orthodontic treatment. Eur J Orthod. 2003;25:359–363. - PubMed
    1. Sebaoun JD, Kantarci A, Turner JW, Carvalho RS, Van Dyke TE, Ferguson DJ. Modeling of trabecular bone and lamina dura following selective alveolar decortication in rats. J Periodontol. 2008;79:1679–1688. - PMC - PubMed
    1. Nimeri G, Kau CH, Abou-Kheir NS, Corona R. Acceleration of tooth movement during orthodontic treatment-a frontier in orthodontics. Prog Orthod. 2013;14:42. - PMC - PubMed