Effect of different types of force on the amount of tooth movement, hyaline areas, and root resorption in rats

Osmar Aparecido Cuoghi; Pedro Marcelo Tondelli; Marcos Rogério Mendonça; Carlos Alberto Aiello; Silvano Cesar da Costa; Orlando Motohiro Tanaka

doi:10.4103/ejgd.ejgd_89_18

European Journal of General Dentistry, Table of Contents

CC BY-NC-ND 4.0 · European Journal of General Dentistry 2018; 7(03): 66-71
DOI: 10.4103/ejgd.ejgd_89_18

Original Article

Effect of different types of force on the amount of tooth movement, hyaline areas, and root resorption in rats

Osmar Aparecido Cuoghi

Department of Pediatric and Community Dentistry, Universidade Estadual Paulista, Campus Araçatuba, SP, Brazil

,

Pedro Marcelo Tondelli

¹Department of Oral Medicine and Pediatric Dentistry, Londrina State University, Londrina, Brazil

,

Marcos Rogério Mendonça

Department of Pediatric and Community Dentistry, Universidade Estadual Paulista, Campus Araçatuba, SP, Brazil

,

Carlos Alberto Aiello

²HRCA/USP, Bauru, Brazil

,

Silvano Cesar da Costa

³Department of Statistics, Londrina State University, Londrina, Brazil

,

Orlando Motohiro Tanaka

⁴School of Life Sciences, Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, Brazil

› Author Affiliations

Abstract

Aims: This study evaluated the effects of using continuous, continuous interrupted, and intermittent forces on the roots and periodontal ligaments in the first molars of rats. Materials and Methods: The right first molars of 54 Wistar rats were moved with continuous force (CF group), continuous interrupted force (CIF group), or intermittent force (IF group) for 5, 7, and 9 days. Ankylosed incisors were used as anchors for the orthodontic tooth movement. To establish the different types of force, NiTi springs of 50 cN were maintained, deactivated, or removed for certain periods. Amounts of tooth movement, hyaline areas, and root resorption levels were analyzed using analysis of variance (ANOVA) and post-hoc Tukey’s test with a significance level of 5%. Results: There was no difference in the amount of tooth movement between the CF and CIF groups, which differed significantly from the IF group. The CF group demonstrated a significant formation of hyaline areas, nearly 5 times more, mainly on the fifth day. Conclusions: Continuous force produced more hyaline areas with greater probability of generating root resorption. Continuous interrupted force enabled better periodontal ligament repair and more efficient elimination of hyaline areas.

Keywords

Ankylosis - hyaline - rats - root resorption - tooth movement

Full Text

References

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