The Comparison of Shear Bond Strength of Brackets Adhered to Enamel Pretreated with Three Methods of CO2, Er, Cr:YSGG Lasers with Acid Phosphoric

Document Type : Original Article

Authors

1 1-Department of Orthodontics, School of Dentistry, Ahvaz Jundishapur University of Medical Sciences,Ahvaz, Iran.

2 Department of Pedodontics, School of Dentistry, Ahvaz, Jundishapur University of Medical Sciences, Ahvaz, Iran.

3 Department of Endodontics, School of Dentistry, Ahvaz, Jundishapur University of Medical Sciences, Ahvaz, Iran.

4 Endodontist.

Abstract

Background and Objective: The purpose of this study was to evaluate the effect of CO2 and Er, Cr:YSGG Hydrokinetic lasers on enamel conditioning for bonding of brackets in comparison with acid etching technique.
Subjects and Methods: Ninety intact freshly preserved extracted premolars were chosen and divided into three groups (30 each). Then the teeth in acid etch group were conditioned with acid etching technique with 37% phosphoric acid and in CO2 group were conditioned with setting 3W (pps 150 mj ) using CO2  laser and in laser ErCr YSGG group were conditioned with setting 3W (pps 150 mj) using ErCr YSGG Hidrokiase  laser. Then 3M brackets were bonded to teeth by 3M light cure composite in each group.  For determination of bonding strength the samples were exposed to cutting force of 1 mm velocity per minute with universal testing machine. Descriptive and t test were used for comparison between groups with P<0.05 level of significance.
Results: The mean values of bonding strengths to MP were as follows: for acid etching technique 11.3, laser CO2 technique 8.8, laser ErCr YSGG Hidrokinetic technique 9.5. The highest value of bonding strength, although statistically insignificant, was in acid etch group.
Conclusion: The results of this study showed that use of laser conditioning enamel surface treatment produced less bonding strength in comparison with acid etching, but its difference was not significant. Moreover, the high SD (Variations- standard deviation) seen in both laser groups compared with acid etch group, makes questionable the reliability and predictability of laser-etching method. Further studies on clinical application of laser are still needed.

Keywords

References

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Jundishapur Scientific Medical Journal
Volume 13, Issue 4 - Serial Number 91
July and August 2014
Pages 419-426

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History

  • Receive Date: 03 July 2011
  • Revise Date: 25 October 2014
  • Accept Date: 05 July 2017

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