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Related Experiment Videos

In vitro quality testing of dentin adhesives

G Oilo1, E K Austrheim

  • 1NIOM, Scandinavian Institute of Dental Materials, Haslum, Norway.

Acta Odontologica Scandinavica
|August 1, 1993
PubMed
Summary
This summary is machine-generated.

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Tensile and shear bond strength tests are comparable for evaluating dentin adhesives. Thermocycling revealed differences in bond durability among tested adhesive systems, indicating its value for quality assessment.

Area of Science:

  • Dental Materials Science
  • Adhesive Dentistry
  • Biomaterials Testing

Background:

  • Dentin adhesive systems are crucial for durable composite restorations.
  • Evaluating the bond strength and durability of these adhesives is essential for clinical success.
  • Comparative studies are needed to assess the performance of different dentin bonding agents.

Purpose of the Study:

  • To compare the efficacy of tensile and shear bond strength tests for evaluating dentin adhesives.
  • To assess the bond strength and durability of four different dentin adhesive systems after thermocycling.
  • To investigate the failure modes of bonded specimens using Scanning Electron Microscopy (SEM).

Main Methods:

  • Four dentin adhesive systems (Gluma, Scotchbond 2, Scotchbond Multi-Purpose, Syntac) were tested.

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  • Composite resins were bonded to human third molar dentin.
  • Specimens underwent either 24-hour storage or thermocycling before tensile or shear bond strength testing.
  • Scanning Electron Microscopy (SEM) was used to analyze fracture patterns.

    • Main Results:

    • No significant difference in bond strength was observed between tensile and shear tests for specimens stored for 24 hours.
    • Thermocycling revealed varied effects on bond strength: Gluma showed no change, Scotchbond 2 decreased significantly, while Scotchbond Multi-Purpose and Syntac increased significantly.
    • SEM analysis indicated a correlation between increased bond strength and cohesive failure within the resin and dentin.

    Conclusions:

    • Both tensile and shear bond strength tests are suitable for quality assessment of dentin adhesives.
    • Thermocycling is a valuable method for assessing the long-term durability and quality of dentin adhesive bonds.
    • The performance and failure modes of dentin adhesives can vary significantly under simulated aging conditions.