Abstract | OBJECTIVE: This study investigated the influence of hydrofluoric acid (HF) etching at different concentrations on the fatigue failure load of adhesively cemented feldspathic ceramic discs ( Vita Mark II). Besides, their effect on the micromorphology of ceramic surface was investigated. METHODS: Eighty ceramic discs (ϕ=10 mm; thickness=1.5 mm) were cemented to epoxy supporting discs (ϕ=10 mm; thickness=2.0mm) using different surface conditioning methods (n=20): nonetched control (CTRL), or etched for 60s with different HF concentrations: 1% (HF1), 5% (HF5), or 10% (HF10). All the ceramic discs received a silane application (Monobond Plus). The epoxy discs were etched with 10% HF for 60s and received a primer coating (Multilink Primer A+B). Adhesively cementation was performed (Multilink Automix), and the assemblies (ceramic discs/epoxy discs) were subjected to cyclic loads in water by a staircase approach (500,000 cycles; 20Hz; initial load=290N; step size=30N). Fatigue failure load data were analyzed using 1-way ANOVA and post-hoc Tukey's tests (α=.05). RESULTS: Mean failure load of the HF5 group (255.0±23.0N) was significantly lower; HF1 group (301.7±71.0N) presented intermediate values, and the highest values were achieved in CTRL (351.7±13.4N) and HF10 (341.7±20.6N) groups. All the failures were radial cracks starting from the bonding surface. SIGNIFICANCE: In terms of fatigue failure load, etching with 1% and 5% HF had a deleterious effect on the fatigue behavior of an adhesively cemented feldspathic ceramic, while 10% HF had no negative influence.
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Authors | Andressa B Venturini, Catina Prochnow, Gabriel K R Pereira, Arie Werner, Cornelis J Kleverlaan, Luiz Felipe Valandro |
Journal | Dental materials : official publication of the Academy of Dental Materials
(Dent Mater)
Vol. 34
Issue 4
Pg. 667-675
(04 2018)
ISSN: 1879-0097 [Electronic] England |
PMID | 29397196
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | Copyright © 2018 The Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. |
Chemical References |
- Aluminum Silicates
- Dental Cements
- Monobond S
- Potassium Compounds
- Resin Cements
- multilink adhesive system
- feldspar
- Hydrofluoric Acid
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Topics |
- Acid Etching, Dental
- Aluminum Silicates
(chemistry)
- Ceramics
(chemistry)
- Dental Cements
(chemistry)
- Dental Restoration Failure
- Dental Stress Analysis
- Hydrofluoric Acid
(chemistry)
- In Vitro Techniques
- Materials Testing
- Potassium Compounds
(chemistry)
- Resin Cements
(chemistry)
- Surface Properties
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