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Related Experiment Videos

Self-etching dentin primers containing phenyl-P

H Chigira1, W Yukitani, T Hasegawa

  • 1Department of Operative Dentistry, Showa University School of Dentistry, Tokyo, Japan.

Journal of Dental Research
|May 1, 1994
PubMed
Summary

New self-etching dentin primers containing Phenyl-P prevented polymerization contraction gaps in resin composites. Dentin hardness slightly decreased but did not impact bond strength or gap formation.

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Area of Science:

  • Dental Materials Science
  • Adhesive Dentistry

Background:

  • Dentin bonding systems are crucial for composite restorations.
  • Polymerization contraction gaps can compromise restoration longevity.
  • Self-etching primers offer simplified application but require efficacy evaluation.

Purpose of the Study:

  • To evaluate the dentin bonding efficacy of experimental self-etching primers.
  • To assess the impact of these primers on polymerization contraction gaps and bond strength.
  • To investigate changes in dentin hardness following self-etching primer application.

Main Methods:

  • Tested two commercial dentin bonding systems and experimental primers (Phenyl-P with HEMA or GM).
  • Measured polymerization contraction gap width in cylindrical dentin cavities.

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  • Determined tensile bond strength to flat dentin surfaces.
  • Assessed dentin hardness using Micro Vickers Hardness and SEM.

    • Main Results:

    • Experimental primers completely prevented contraction gap formation when used with a commercial bonding agent.
    • Commercial systems showed gap formation in nearly half of specimens.
    • Mean tensile bond strengths ranged from 16.3 to 20.7 MPa with no significant differences.
    • A slight reduction in dentin hardness was observed but did not correlate with gap width or bond strength.

    Conclusions:

    • Experimental self-etching primers containing Phenyl-P effectively prevent polymerization contraction gaps.
    • Dentin hardness reduction is minimal and does not negatively affect bonding performance.
    • These primers show promise for improving the clinical performance of resin composites.