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Testing mode and surface treatment effects on dentin bonding

J L Drummond1, R L Sakaguchi, D C Racean

  • 1College of Dentistry, University of Illinois at Chicago 60612-7421, USA. U48032@uic.edu

Journal of Biomedical Materials Research
|December 1, 1996
PubMed
Summary
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Cyclic fatigue significantly reduces dentin bond strength compared to static loading. Both 10% and 32% phosphoric acid etching yield similar bond strengths, with push-out and planar shear tests showing comparable results.

Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Adhesive Dentistry

Background:

  • Evaluating dentin bond strength is crucial for dental restoration longevity.
  • Understanding the influence of testing parameters on bond strength is essential for accurate material assessment.

Purpose of the Study:

  • To investigate the impact of testing mode (cyclic fatigue vs. static loading), surface treatment (phosphoric acid etching), and shear test type (planar vs. push-out) on dentin-bonding test results.

Main Methods:

  • Specimens were subjected to static or cyclic fatigue loading (1000 cycles) at a rate of 2 mm/min.
  • Dentin surfaces were treated with 32% or 10% phosphoric acid, or left unetched.
  • Shear bond strength was assessed using traditional planar and push-out tests.

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Main Results:

  • Cyclic fatigue reduced bond strength to approximately 51% of static loading values.
  • 10% phosphoric acid was as effective as 32% phosphoric acid for dentin bonding.
  • Push-out and planar shear tests showed no significant difference in bond strength on etched surfaces, though push-out was more labor-intensive.

Conclusions:

  • Cyclic fatigue is a critical factor affecting dentin bond durability.
  • Lower concentrations of phosphoric acid are sufficient for effective dentin etching.
  • Both planar and push-out shear tests can provide comparable bond strength data, with considerations for procedural complexity.