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Should statistical analysis of bond-strength data include or exclude cohesive failures?

A Franz1, S Lettner1, D C Watts2

  • 1University Clinic of Dentistry, Medical University of Vienna, Austria.

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|November 8, 2022
PubMed
Summary
This summary is machine-generated.

This study compared four self-etch bonding agents, finding that excluding cohesive failures skewed results for OptiBond™ XTR (OBXTR). Researchers recommend including all failure modes in statistical analysis for accurate bonding agent evaluation.

Keywords:
Bovine dentinDentin bonding agentsFailure modesShear strengths

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Area of Science:

  • Dental Materials Science
  • Adhesive Dentistry
  • Biomaterials Research

Background:

  • Self-etch bonding agents are crucial for dental restorations.
  • Evaluating their shear bond strength is essential for clinical success.
  • Understanding failure modes influences material performance assessment.

Purpose of the Study:

  • To investigate shear bond strengths and failure modes of four self-etch bonding agents on bovine dentin and enamel.
  • To compare data analysis with and without the exclusion of cohesive failure specimens.
  • To determine the impact of cohesive failures on the interpretation of bonding agent performance.

Main Methods:

  • Four self-etch bonding agents were tested: Scotchbond Universal (SBU), OptiBond™ XTR (OBXTR), OptiBond™ universal (OBU), and Prime & Bond active (PBA).
  • Composite cylinders were bonded to bovine dentin and enamel, and shear bond strengths were measured.
  • Statistical analysis was performed on overall data and after excluding cohesive failures.

Main Results:

  • When all failures were included, OBU and OBXTR showed comparable bond strengths; SBU and PBA had lower enamel bond strengths.
  • Excluding cohesive failures minimally impacted most agents but significantly reduced OBXTR's apparent dentin bond strength.
  • OBXTR exhibited higher shear strengths with cohesive failures present.

Conclusions:

  • Excluding cohesive failures can misrepresent the true performance of certain bonding agents, like OBXTR.
  • The study advises against excluding data based on specific fracture modes in statistical analysis.
  • Accurate evaluation of self-etch bonding agents requires considering all failure modes.