Bond strength of composite core build-up materials to fiber-reinforced posts: a microtensile comparison between conventional and wet-ethanol bonding systems
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Updated: Jun 19, 2026

Standard Test Method ASTM D 7998-19 for the Cohesive Strength Development of Wood Adhesives
Published on: May 17, 2020
Hani F Ounsi1, Ziad Salameh, Carlos Augusto Carvalho
1Department of Dental Materials and Restorative Dentistry, School of Dental Medicine, University of Siena, Policlinico Le Scotte, Viale Bracci, Siena, Italy.
Purpose:
To evaluate the interfacial microtensile bond strength between a fiber-reinforced post (Rely X Post) and a core material (Multicore Flow) after placing different bonding agents.
Materials And Methods:
After post surface treatment, 50 posts were divided into 5 groups. Group 1: Adper Prompt-L-Pop; group 2: SingleBond2; group 3: ScotchBond Multipurpose Plus; group 4: experimental bonding system (wet ethanol bonding technique); group 5: control group. After core reconstruction, the samples were tested with the microtensile test. Fracture type examination and SEM observation followed. Data were statistically analyzed with Kruskall-Wallis non-parametric ANOVA.
Results:
Microtensile testing revealed significant differences (p < 0.001). There were no differences between groups 1 to 4, but there was a statistically significant difference between groups 1 to 4 and the control. Fracture type observations revealed more adhesive failures than cohesive or mixed ones.
Conclusion:
The experimental bonding technique did not improve bond strength compared to the different adhesive systems tested. However, placing a bonding agent between the post and the core seems to significantly increase microtensile bond strength.
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