08 May 2019 : Laboratory Research
Application of a Novel Modification of the Microbond Test for Evaluation of Adhesive Bond Strength Between Fiber Posts and Dual-Cure Dental Resin Cement
Aleksandra Maletin1ABCDEF*, Dubravka Markovic1A, Isidora Neskovic1B, Bojana Ramic1C, Tanja Veljovic1E, Ivan Ristic2ABCDEDOI: 10.12659/MSM.914151
Med Sci Monit 2019; 25:3397-3405
Abstract
BACKGROUND: While several tests can be used in the laboratory evaluation of composite resin-based cement materials, the push-out test remains the most prevalent. Due to difficulties in sample preparation, as well as a highly complex procedure, we attempted to develop an alternative method for testing the bond strength of dental resin cement materials.
MATERIAL AND METHODS: Ninety-six experimental samples of 2 dual-cure resin cements and 1 fiber post system were prepared for the 2 testing procedures: the push-out test and the modified Microbond test. The degree of monomer conversion was measured by Fourier-transform infrared spectroscopy.
RESULTS: The push-out test results indicated that the bond strength of dual-cure resin cement differs depending on the tooth root region to which it is applied (p<0.05), In addition, our findings show that Variolink II exhibits a much lower bond strength relative to RelyX ARC. These findings were confirmed by the modified Microbond test results. The monomer conversion rate results indicate average conversion rates of 85.81% and 61.35% for RelyX ARC and Variolnik II, respectively.
CONCLUSIONS: Our study confirms the practical utility of the modified Microbond test in the assessment of bond strength of dental cement resin-based materials. The proposed test method is particularly useful given that, relative to the push-out test, it requires a much smaller number of preparation and execution steps, thus reducing the potential for introducing errors, while increasing the reliability of the obtained findings.
Keywords: Dental Bonding, Dental Debonding, Resin Cements, Adhesives, Bisphenol A-Glycidyl Methacrylate, Composite Resins, Dental Cements, Dental Materials, Dental Porcelain, Dental Stress Analysis, Dentin, Materials Testing, Polyethylene Glycols, Polymethacrylic Acids, Reproducibility of Results, Resins, Synthetic, Tooth Root
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