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Related Concept Videos

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Bonding and Strength of Aggregate

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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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Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
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Related Experiment Video

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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
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Dentin-composite bond strength measurement using the Brazilian disk test.

Carola A Carrera1, Yung-Chung Chen1, Yuping Li1

  • 1Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, MN, USA.

Journal of Dentistry
|July 11, 2016
PubMed
Summary

A modified Brazilian disk test (BDT) effectively measures composite resin and dentin bond strength. This new method offers reduced variability and consistent interfacial failure, improving clinical performance prediction.

Keywords:
AdhesiveBond strengthBrazilian diskDentinResin composite

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Adhesion Science

Background:

  • Assessing the bond strength between composite resins and dentin is crucial for predicting the longevity of dental restorations.
  • Existing testing methods may suffer from variability and premature failures, limiting their clinical relevance.

Purpose of the Study:

  • To present and validate a modified Brazilian disk test (BDT) for evaluating the bond strength between composite resins and dentin.
  • To compare the performance of different dental adhesives and composite resins using the modified BDT.

Main Methods:

  • Dentin-composite disks were prepared using two composite resins (Z100, Z250) and three adhesives (Adper Easy Bond, Adper Scotchbond Multi-Purpose, Adper Single Bond).
  • The modified BDT was employed under diametral compression, with acoustic emission (AE) and digital image correlation (DIC) monitoring debonding.
  • Finite element analysis (FE) was used to calculate bond strengths, and scanning electron microscopy (SEM) examined fracture modes.

Main Results:

  • The modified BDT demonstrated significantly higher mean bond strength with Adper Easy Bond (EB) compared to Adper Scotchbond Multi-Purpose (MP) and Adper Single Bond (SB).
  • Z100 composite resin exhibited higher bond strength than Z250.
  • The majority of failures (91.3%) were adhesive, with specific failure modes varying by adhesive type.

Conclusions:

  • The modified Brazilian disk test is a suitable alternative for measuring dentin-composite bond strength, exhibiting zero premature failures and reduced measurement variability.
  • This validated test method provides consistent interfacial failure data, enhancing the prediction of clinical performance for dental adhesive systems.