Evaluation of the Shear Bond Strength and Adhesive Remnant Index in Debonding of Stainless Steel Brackets Assisted with Nd:YAG Laser Irradiation

  • Maryam Nasiri Post graduate Student, Department of Orthodontics School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
  • Seyed Amir Hossein Mirhashemi Assistant Professor, Laser Research Center of Dentistry, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran ; Department of Orthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
  • Ardavan Etemadi Assistant Professor, Laser Research Center of Dentistry, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran and Statistical Advisor, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
  • Mohammad Javad Kharrazi fard Assistant Professor, Department of Orthodontics School of Dentistry, Qom University of Medical Sciences, Qom, Iran
  • Elahe Soltanmohamadi Borujeni Researcher, Research Center of Caries Prevention, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
  • Maryam Javaheri Mahd Post gradute Student, Department of Orthodontics School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
  • Pegah Khazaei Professor, Laser Research Center of Dentistry, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
  • Mohammad Sadegh Ahmad Akhoundi Department of Orthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
Keywords: Nd:YAG Laser, Dental Debonding, Orthodontic Brackets

Abstract

Objectives: The purpose was to compare shear bond strength (SBS), pulp temperature, and adhesive remnant index (ARI) in debonding of stainless steel brackets from enamel surface using neodymium-doped yttrium aluminum garnet (Nd:YAG) laser versus the conventional debonding method.

Materials and Methods: Forty-eight extracted premolars were bonded to stainless steel brackets. The samples were divided into three experimental groups and one control group. In the first three groups, Nd:YAG laser was used for debonding with the power of 1, 1.5, and 2 W, respectively, for 10 seconds. The SBS and ARI of the samples were assessed. Pulp temperature was recorded before and after irradiation. Two samples from each group were used for determining enamel morphology after debonding using scanning electron microscopy (SEM).

Results: The mean SBS in the groups was 33.05, 28.69, 24.37, and 31.53 MPa, respectively, with no statistically significant differences (P=0.205). Significant differences in post-irradiation temperature were noted among the lased groups (P=0.000). Debonding mainly occurred at the adhesive-enamel interface in the 1-W laser and control groups and at the bracket-adhesive interface in the 1.5-W and 2-W laser groups. Enamel structure was amorphous and irregular following laser irradiation.

Conclusions: Based on the results of this study, the use of Nd:YAG laser could not significantly affect the SBS. Therefore, this laser would not be suitable for debonding of metal brackets. The use of a 2-W laser could significantly raise the pulpal temperature. Nd:YAG laser renders a more heterogeneous enamel morphology compared to conventional debonding methods. 

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Published
2019-01-20
How to Cite
1.
Nasiri M, Mirhashemi SAH, Etemadi A, Kharrazi fard MJ, Soltanmohamadi Borujeni E, Javaheri Mahd M, Khazaei P, Ahmad Akhoundi MS. Evaluation of the Shear Bond Strength and Adhesive Remnant Index in Debonding of Stainless Steel Brackets Assisted with Nd:YAG Laser Irradiation. Front Dent. 16(1):37-44.
Section
Original Article

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