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Related Concept Videos

Bonding and Strength of Aggregate01:12

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The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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Micro versus Macro Shear Bond Strength Testing of Dentin-Composite Interface Using Chisel and Wireloop Loading

Ahmed M Ismail1,2, Christoph Bourauel2, Ahmed ElBanna1

  • 1Biomaterials Department, Faculty of Dentistry, Ain Shams University, Cairo 11566, Egypt.

Dentistry Journal
|December 23, 2021
PubMed
Summary
This summary is machine-generated.

This study found that micro-sized specimens and chisel loading significantly influence shear bond strength (SBS) testing results in dental adhesives. These factors are recommended for more accurate SBS evaluation.

Keywords:
chisel loadingcomposite resin materialsdental adhesive resindentine substratefailure modefractographymicroshear bond strengthshear bond strengthwireloop loading

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Adhesive Dentistry

Background:

  • Shear bond strength (SBS) testing is crucial for evaluating dental adhesive systems.
  • Failure mode analysis enhances the interpretation of SBS results.
  • Specimen dimensions and loading techniques can impact SBS outcomes.

Purpose of the Study:

  • To investigate the effect of specimen dimension (macro vs. micro) and loading technique (wireloop vs. chisel) on SBS.
  • To analyze failure modes in relation to these testing parameters.
  • To provide recommendations for optimizing SBS testing methodologies.

Main Methods:

  • Eighty macro and micro flowable composite specimens were prepared and bonded to dentin.
  • Four groups were tested: Macroshear wireloop, Microshear wireloop, Macroshear chisel, and Microshear chisel.
  • Shear bond strength was measured, followed by failure mode analysis using digital microscopy and SEM.

Main Results:

  • The Microshear chisel group (Gp4) exhibited the highest mean stress at failure (54.1 ± 14.1 MPa).
  • Gp4 also showed the highest incidence of adhesive failure.
  • Statistical analysis (ANOVA, Kruskal-Wallis) confirmed significant differences between groups.

Conclusions:

  • Specimen dimension and loading technique are critical factors affecting SBS results.
  • Micro-sized specimens combined with a chisel loading technique are recommended for more reliable shear bond strength testing.