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Related Experiment Videos

Relation between water content in acetone/alcohol-based primer and interfacial ultrastructure

F R Tay1, J A Gwinnett, S H Wei

  • 1Prince Philip Dental Hospital, University of Hong Kong, Hong Kong.

Journal of Dentistry
|April 16, 1998
PubMed
Summary

The water content in dental primer systems significantly impacts resin-dentine interface quality. Optimal hybridization and tubular sealing depend on balancing primer water concentration and dentine surface moisture during bonding.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Adhesive Dentistry

Background:

  • The resin-dentine interface is crucial for the longevity of dental restorations.
  • Two-bottle primer systems, containing monomers like N(p-tolyl)glycine-glycidyl methacrylate (NTG-GMA) and biphenyl dimethacrylate (BPDM), are widely used.
  • The role of water within the primer solvent on the integrity of this interface requires detailed investigation.

Purpose of the Study:

  • To investigate the ultrastructure of the resin-dentine interface using different concentrations of water in a two-bottle primer system.
  • To evaluate the effect of primer water content and dentine surface moisture on hybridization and tubular sealing.

Main Methods:

  • Three versions of a primer system with varying water content (0%, 5%, 17%) were tested.

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  • Dentine discs were conditioned and subjected to different drying protocols (air-dried for 30s, air-dried for 3s, blot-dried).
  • Bonded specimens were demineralized and examined using transmission electron microscopy (TEM).

    • Main Results:

    • The water-free primer showed sub-optimal hybridization when dentine was dried.
    • The 5% water primer exhibited compromised hybridization with prolonged drying and resin globules with moist technique.
    • The 17% water primer displayed 'overwet phenomenon' characteristics with moist techniques.

    Conclusions:

    • Primer water content influences the sensitivity to dentine surface moisture conditions.
    • There is an optimal 'window of opportunity' for hybridization and tubular seal, which shifts based on primer water concentration.
    • Careful management of primer water content and dentine surface moisture is essential for achieving a durable resin-dentine bond.