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Published on: May 17, 2020
Measuring bond strength between fiber post and root dentin: a comparison of different tests
Carina Strano Castellan1, Paulo César Santos-Filho, Paulo Vinicius Soares
1Department of Biomaterials and Oral Biochemistry, Dental School, University of Sao Paulo, São Paulo, SP, Brazil. carina@usp.br
The Journal of Adhesive Dentistry
|February 17, 2010
Summary
The specimen design significantly impacts fiber post bond strength test results. Different testing methods yield varying bond strength values, failure modes, and stress distributions, influencing accuracy.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Endodontics
Background:
- Accurate assessment of fiber post bond strength is crucial for endodontic treatment success.
- Existing bond strength tests may be influenced by specimen design and methodology.
- Understanding these influences is key to reliable material evaluation.
Purpose of the Study:
- To evaluate the accuracy of different bond strength tests for fiber posts luted into root canals.
- To compare the influence of specimen design on bond strength measurement.
- To analyze reliability, failure modes, and stress distribution across various testing methods.
Main Methods:
- Four bond strength tests were evaluated: hourglass microtensile (HM), push-out (PS), modified push-out (MP), and pull-out (PL).
- Parameters assessed included bond strength, reliability (Weibull analysis), failure mode (confocal microscopy), and stress distribution (finite element analysis).
- Human teeth were used, with specific sample dimensions and designs for each test group.
Main Results:
- Pull-out (PL) tests yielded the highest bond strength values, often with adhesive failures.
- Push-out (PS) tests showed a higher frequency of cohesive failures.
- Modified push-out (MP) demonstrated more homogeneous stress distribution and a higher Weibull modulus.
Conclusions:
- Specimen design is a critical factor influencing the biomechanical behavior and outcomes of bond strength tests.
- The choice of testing method significantly affects the measured bond strength and failure characteristics of fiber posts.
- Results suggest that modified push-out tests may offer a more reliable assessment of fiber post-dentin bonding.
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