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Related Experiment Videos

Dentin bond durability after three years using a dentin bonding agent with and without priming

M F Burrow1, M Satoh, J Tagami

  • 1School of Dental Science, University of Melbourne, Australia. m.burrow@dent.unimelb.edu.au

Dental Materials : Official Publication of the Academy of Dental Materials
|September 1, 1996
PubMed
Summary

Priming bovine dentin with 5-NMSA initially improves dual-cured bonding resin strength, but this effect diminishes significantly over three years, resulting in similar bond strengths for primed and unprimed groups. This suggests priming may offer only short-term benefits for dental restorations.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Adhesive Dentistry

Background:

  • Dental bonding resins are crucial for restorative procedures.
  • Understanding long-term bond strength is essential for clinical success.
  • Priming agents aim to enhance adhesion between resin composites and tooth structure.

Purpose of the Study:

  • To evaluate the long-term tensile bond strength of a dual-cured bonding resin to bovine dentin.
  • To compare the effects of priming versus no priming on bond strength over a three-year period.

Main Methods:

  • Bovine dentin was conditioned and either primed with 5-NMSA or left unprimed (control).
  • A dual-cured bonding resin system was applied and light-cured.
  • Tensile bond strength was tested at multiple time points up to three years.

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  • Failure modes were analyzed using SEM.

    • Main Results:

    • The primed group initially exhibited significantly higher bond strength (10.6 MPa) than the non-primed group (5.2 MPa).
    • Over three years, the primed group's bond strength decreased significantly (p < 0.05) to 5.5 MPa, while the non-primed group decreased slightly to 4.3 MPa.
    • SEM revealed hybrid layer formation in the primed group but minimal resin infiltration in the control group.

    Conclusions:

    • Priming with 5-NMSA initially enhances bond strength but leads to a marked decrease over three years.
    • The long-term bond strength of primed and unprimed groups becomes comparable after three years.
    • Priming may be beneficial only for short-term bonding, with implications for the clinical longevity of dental restorations.