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Related Experiment Videos

Single-step adhesives are permeable membranes.

Franklin R Tay1, David H Pashley, Byoung I Suh

  • 1Paediatric Dentistry and Orthodontics, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, 34 Hospital Road, Hong Kong, SAR, People's Republic of China. kfctay@hknet.com

Journal of Dentistry
|January 30, 2003
PubMed
Summary

Delayed light activation significantly reduces single-step adhesive bond strength to hydrated dentine. This effect, linked to water diffusion and osmotic blistering, is absent with dehydrated dentine or composite substrates.

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Area of Science:

  • Dental Materials Science
  • Adhesive Dentistry
  • Biomaterials

Background:

  • Single-step adhesives offer clinical convenience but their long-term performance is crucial.
  • Understanding factors affecting bond strength is vital for predictable clinical outcomes.
  • The influence of delayed composite light-activation on dentine bonding needs clarification.

Purpose of the Study:

  • To investigate the effect of delayed light-activation of composite on the micro-tensile bond strength of single-step adhesives to dentine.
  • To determine if water from the dentine substrate is a contributing factor to bond strength reduction.
  • To compare the behavior of single-step adhesives with a control three-step adhesive.

Main Methods:

  • Micro-tensile bond strength testing of seven adhesives (one three-step control, six single-step) bonded to hydrated dentine.

Related Experiment Videos

  • Delayed light-activation (20 min) of composite versus immediate activation was assessed.
  • Experiments were repeated on dehydrated dentine and a composite substrate to isolate the effect of water.

    • Main Results:

    • Delayed light-activation significantly reduced bond strengths of all single-step adhesives to hydrated dentine (p < 0.05).
    • No adverse effect was observed with the control three-step adhesive.
    • Bond strength reduction was not seen when bonding to dehydrated dentine or a composite substrate.

    Conclusions:

    • Single-step adhesives are susceptible to bond strength reduction due to delayed composite light-activation on hydrated dentine.
    • Water diffusion through the adhesive layer, causing osmotic blistering and emulsion polymerization, likely compromises bond strength.
    • Clinical protocols should consider immediate light-curing of composites bonded with single-step adhesives to hydrated dentine.