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The impact of Er,Cr:YSGG laser on the shear strength of the bond between dentin and ceramic is dependent on the adhesive material

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Abstract

The bond joint between dentin and ceramic is a critical determinant in prosthodontic dentistry. The laser is an alternative to the diamond bur for preparing tooth cavities. However, the impact of lasers on the bond between the laser-irradiated dentin and the ceramic remains a matter of controversy. We determined the shear strength of bonds between ceramic blocks and human dentin discs prepared with either an Er,Cr:YSGG laser or a diamond bur. A total of 180 dentin discs were randomly assigned to four groups. Three groups of discs were prepared with the Er,Cr:YSGG laser irradiation (2 W, 30 Hz, 50% H2O, 70% air) and the fourth group was prepared with a diamond bur. In one of the laser groups the discs surfaces were also treated with phosphoric acid and in another with phosphoric acid and mechanical smoothing using a dental excavator. The ceramic blocks were bonded to the dentin discs with Syntac adhesive (together with Variolink II curing system), ExciTE adhesive (together with Variolink II curing system) or RelyX self-adhesive cement. The shear strength of the bond between ceramic and dentin was significantly higher following dentin surface treatment with the laser alone than following treatment with the diamond bur and Variolink II/Syntac (p = 0.021) but not significantly higher than following treatment with the diamond bur and Variolink II/ExciTE (p = 0.138) or RelyX (p = 0.150). A significant difference was not observed when the laser-treated dentin was conditioned with phosphoric acid and mechanical smoothing. These findings demonstrate that the bond between dentin and ceramic may be stronger after laser irradiation; however, the selection of the adhesive material is an additional factor that affects the bond strength.

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Acknowledgment

The authors thank Mr. Patryk Starzec for skillful technical assistance.

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Authors and Affiliations

  1. Unit-Division of Dental Student Training and Patient Care, Medical University of Vienna, Sensengasse 2a, 1090, Vienna, Austria

    Barbara Cvikl, Gundula Moser, Jörg Wernisch, Modesto Raabe & Andreas Moritz

  2. Department of Oral Surgery, Medical University of Vienna, Sensengasse 2a, 1090, Vienna, Austria

    Reinhard Gruber

  3. Austrian Cluster for Tissue Regeneration, 1090, Vienna, Austria

    Reinhard Gruber

Authors
  1. Barbara Cvikl
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  2. Gundula Moser
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  3. Jörg Wernisch
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  4. Modesto Raabe
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  5. Reinhard Gruber
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  6. Andreas Moritz
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Correspondence to Barbara Cvikl or Reinhard Gruber.

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Cvikl, B., Moser, G., Wernisch, J. et al. The impact of Er,Cr:YSGG laser on the shear strength of the bond between dentin and ceramic is dependent on the adhesive material. Lasers Med Sci 27, 717–722 (2012). https://doi.org/10.1007/s10103-011-0963-5

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  • DOI: https://doi.org/10.1007/s10103-011-0963-5

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