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Smear Layer-Deproteinization: Improving the Adhesion of Self-Etch Adhesive Systems to Caries-Affected Dentin

  • Dental Restorative Materials (M Özcan, Section Editor)
  • Published:
Current Oral Health Reports Aims and scope Submit manuscript

Abstract

Purpose of review

This paper reviews a new method of dentin surface modification, smear layer-deproteinization for self-etch adhesive systems, particularly in relation to improving the adhesion to caries-affected dentin.

Recent Findings

Remnants of smear debris, which forms hybridized smear layer with self-etch adhesives, can prevent monomer infiltration and interfere with the chemical interaction of adhesive monomers and the underlying dentin. The hybridized smear layer weakens the physical and chemical properties of the resin-dentin hybridized complex both immediately and over time. Smear layer-deproteinization with NaOCl and HOCl solutions can improve the quality of resin-dentin interface of self-etch adhesives through elimination of the hybridized smear layer, development of monomer infiltration, and enhancement of the chemical interaction of adhesive monomers with hydroxyapatite due to an increase in the mineral/organic ratio on the dentin surface. These positive effects are influenced by the types of oxidizing solution and their application time and also depend upon the adhesive materials used because compromising effects of residual oxidized-byproducts at the dentin surface on the polymerization behavior of the adhesives are different between the materials. However, applying antioxidant/reducing agents can eliminate this problem.

Summary

Smear layer-deproteinization is more effective for improving the bonding efficacy of self-etch adhesives to caries-affected dentin than normal dentin because caries-affected dentin produces a thicker organic-rich smear layer. Smear layer-deproteinization with HOCl solution, which has a rapid and broad-spectrum antimicrobial activity with less irritating and sensitizing properties, along with the subsequent application of antioxidant/reducing agents could enhance the longevity of composite restoration with self-etch adhesives.

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Authors and Affiliations

  1. Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan

    Keiichi Hosaka, Masahiro Takahashi, Junji Tagami & Masatoshi Nakajima

  2. Department of Restorative Dentistry and Periodontology, Faculty of Dentistry, Chiangmai University, T. Suthep, A. Muang, Chiang Mai, 50200, Thailand

    Taweesak Prasansuttiporn & Sitthikorn Kunawarote

  3. Faculty of Dentistry, Bangkokthonburi University, 16/10 Leabklongtaweewatana Rd., Khet Taweewatana, Bangkok, 10170, Thailand

    Ornnicha Thanatvarakorn

  4. Restorative Dentistry, King’s College London Dental Institute at Guy’s, King’s and St Thomas’ Hospitals, King’s College London, Floor 21, Guy’s Hospital, London, SE1-9RT, UK

    Richard M. Foxton

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  1. Keiichi Hosaka
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  2. Taweesak Prasansuttiporn
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  3. Ornnicha Thanatvarakorn
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  4. Sitthikorn Kunawarote
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  5. Masahiro Takahashi
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  6. Richard M. Foxton
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  7. Junji Tagami
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  8. Masatoshi Nakajima
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Correspondence to Masatoshi Nakajima.

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Hosaka, K., Prasansuttiporn, T., Thanatvarakorn, O. et al. Smear Layer-Deproteinization: Improving the Adhesion of Self-Etch Adhesive Systems to Caries-Affected Dentin. Curr Oral Health Rep 5, 169–177 (2018). https://doi.org/10.1007/s40496-018-0185-z

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