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Lasers in Medical Science

, Volume 28, Issue 1, pp 325–333 | Cite as

Effects of low-intensity laser therapy on periodontal tissue remodeling during relapse and retention of orthodontically moved teeth

  • Su-Jung Kim
  • Yoon-Goo Kang
  • Jong-Hyun Park
  • Eun-Cheol Kim
  • Young-Guk Park
Original Article

Abstract

This study was designed to investigate the effects of low-intensity laser therapy (LILT) on periodontal ligament (PDL) remodeling during relapse and retention after the completion of orthodontic movement. The maxillary central incisors (n = 104) of the 52 rats were randomly divided into five groups according to the treatment modality: baseline control group without any intervention (n = 8); relapse group without retainer after tooth movement (n = 24); retention group with fixed retainer after tooth movement (n = 24); lased relapse group without retainer after tooth movement and LILT (n = 24); lased retention group with retainer after tooth movement and LILT (n = 24). LILT was daily performed using a gallium–aluminum–arsenide diode laser in a biostimulation mode: wavelength of 780 nm, continuous waves at 70 mW output power, a preset low intensity of 1.75 W/cm2 in contact mode, resulting in energy dose of 5 J/cm2 per irradiation for 3 s. The animals were euthanized on days 1, 3, and 7 after removal of the orthodontic appliance. Real-time RT-PCR was performed for quantitative analysis of matrix metalloproteinases mRNA expression. Immunoreactivities of collagen and tissue inhibitor of metalloproteinase were observed on the compression and tension sides. LILT significantly facilitated the expression of five tested MMP mRNAs in both relapse and retention groups. TIMP-1 immunoreactivity was inhibited by LILT in both groups, whereas Col-I immunoreactivity was increased by LILT only in the retention group. These results indicate that LILT would act differently on the stability after orthodontic treatment according to additional retainer wearing or not. LILT when combined with a retainer on the moved teeth may shorten the retention period by accelerating periodontal remodeling in the new tooth position, whereas, LILT on the moved teeth left without any retainer would rather increase the rate of relapse after treatment.

Keywords

Low-intensity laser therapy (LILT) Matrix metalloproteinases Orthodontic tooth movement Periodontal ligament remodeling Tissue inhibitor of metalloproteinases 

Notes

Acknowledgments

This study was supported by a special fund for new researchers of National Research Foundation of Korea, Seoul, Korea (#20101067).

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Copyright information

© Springer-Verlag London Ltd 2012

Authors and Affiliations

  • Su-Jung Kim
    • 1
  • Yoon-Goo Kang
    • 1
  • Jong-Hyun Park
    • 2
  • Eun-Cheol Kim
    • 3
  • Young-Guk Park
    • 1
  1. 1.Department of Orthodontics, Oral Biology Research InstituteKyung Hee University School of DentistrySeoulKorea
  2. 2.Graduate SchoolKyung-Hee UniversitySeoulKorea
  3. 3.Department of Maxillofacial Tissue Regeneration, Oral Biology Research InstituteKyung Hee University School of DentistrySeoulKorea

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