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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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Comparison between two post-dentin bond strength measurement methods.

Laikuan Zhu1,2, Yuping Li3, Yung-Chung Chen4

  • 1Department of Endodontics and Operative Dentistry, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China. zhulk1997@163.com.

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|February 7, 2018
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Summary
This summary is machine-generated.

The diametral compression (DC) test offers more precise post-dentin bond strength measurements than the push-out (PO) test. While requiring finite element analysis, the DC test is simpler and yields more reliable data for post-dentin adhesion.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Adhesive Dentistry

Background:

  • Accurate measurement of post-dentin bond strength is crucial for successful dental restorations.
  • Traditional methods like the push-out (PO) test have limitations in precision and ease of use.
  • The diametral compression (DC) test presents an alternative for evaluating adhesive interfaces.

Purpose of the Study:

  • To compare the precision and practicality of the push-out (PO) test and the diametral compression (DC) test for measuring post-dentin bond strength.
  • To evaluate the reliability of load-displacement curves generated by both testing methods.
  • To determine the most suitable method for assessing the bond strength between dental posts and dentin.

Main Methods:

  • Performed push-out (PO) and diametral compression (DC) tests on post-dentin specimens.
  • Analyzed load-displacement curves to assess linearity and smoothness up to fracture.
  • Compared specimen alignment requirements and standard deviations of measured bond strengths.
  • Noted the necessity of finite element analysis (FEA) for DC test calculations.

Main Results:

  • The DC test provided more precise post-dentin bond strength measurements compared to the PO test.
  • Load-displacement curves from the DC test were significantly smoother and more linear than those from the PO test.
  • The DC test requires no specimen alignment and resulted in a smaller standard deviation in bond strength measurements.
  • The PO test's simple formula for shear bond strength is not valid, and its results are influenced by friction.

Conclusions:

  • The diametral compression (DC) test is a more precise and practical method for determining post-dentin bond strength compared to the push-out (PO) test.
  • Despite requiring finite element analysis (FEA), the DC test offers superior data reliability and ease of performance.
  • The PO test's reliance on friction and invalid shear bond strength calculations limit its accuracy in assessing post-dentin adhesion.