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Bonding to intact dentin

N Nakabayashi1, Y Saimi

  • 1Division of Organic Materials, Tokyo Medical and Dental University, Japan.

Journal of Dental Research
|September 1, 1996
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for dental bonding, using hydroxyapatite paste and ultrasonication to prepare dentin. The new self-etching primer, 2OP-30H, achieved stable bonding on intact dentin, forming robust hybrid layers.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Adhesive Dentistry

Background:

  • Smear layer presence compromises dentinal bonding.
  • Conventional smear layer removal involves acidic agents, leaving a collagen-rich substrate.
  • Acid-conditioned dentin requires priming before adhesive application.

Purpose of the Study:

  • To evaluate a novel smear layer removal technique using hydroxyapatite paste and ultrasonication.
  • To assess the efficacy of a new self-etching primer (2OP-30H) on intact dentin.
  • To characterize the resulting hybrid layers and bond strength.

Main Methods:

  • Dentin specimens were polished with hydroxyapatite paste and ultrasonication to remove smear layers.
  • Bonding was performed using an aqueous solution of 2-methacryloyloxyethyl phenyl phosphoric acid (phenyl-P) and 2-hydroxyethyl methacrylate (2OP-30H).

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  • The 2OP-30H primer was applied to intact dentin for 0, 30, or 60 seconds.

    • Main Results:

    • Mean tensile bond strengths were approximately 10 MPa for both 30- and 60-second priming groups.
    • Hybrid layer widths increased with priming time (0.3 µm at 0s, 2.1 µm at 30s, 4.1 µm at 60s).
    • SEM and TEM confirmed monomer infiltration and diffusion channels into intact dentin, forming stable hybrid layers resistant to acid and bleach treatments.

    Conclusions:

    • The hydroxyapatite paste and ultrasonication method effectively prepares dentin for bonding.
    • The 2OP-30H self-etching primer provides stable bonding to intact dentin.
    • The formed hybrid layers are robust and non-defective, indicating reliable adhesion.