Fatigue Failure Load of a Bonded Simplified Monolithic Feldspathic Ceramic: Influence of Hydrofluoric Acid Etching and Thermocycling
| Autor: | J C Giordani, Luiz Felipe Valandro, I A Silva, A S Vallau, G.K.R. Pereira, Luís Felipe Guilardi, Marília Pivetta Rippe |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Dental Stress Analysis
Ceramics Materials science Surface Properties 02 engineering and technology Dental bonding Hydrofluoric Acid 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Hydrofluoric acid Dental porcelain Acid Etching Dental Etching (microfabrication) Materials Testing Ceramic Composite material General Dentistry Dental Bonding Fatigue testing 030206 dentistry 021001 nanoscience & nanotechnology Feldspathic ceramic Dental Porcelain Resin Cements chemistry visual_art visual_art.visual_art_medium 0210 nano-technology |
| Zdroj: | Operative dentistry. 45(1) |
| ISSN: | 1559-2863 |
| Popis: | SUMMARYObjective:To evaluate the effect of hydrofluoric acid (HF) etching and thermocycling (Tc) on fatigue failure load of feldspathic ceramic restorations cemented with two resin cements.Methods:Disc-shaped feldspathic ceramic (Vitablocs Mark II; Ø=10 mm, 1.0-mm thick) and G10 epoxy resin (Ø=10 mm, 2.5-mm thick) specimens were made and randomly allocated considering three factors: ceramic etching (ie, with vs without 10% HF plus silane application), resin cement (ie, self-adhesive [RelyX U200; U200] or conventional [Multilink Automix; MA]), and Tc (ie, with vs without 5-55°C/12,000 cycles). Adhesive cementation followed each manufacturer's instructions. The fatigue test (n=20) was based on the staircase approach (250,000 cycles; 20 Hz). Contact angle, surface topography, and fractography analysis were also executed. Specific statistical tests were employed for each outcome (α=0.05).Results:The interaction of HF and Tc factors decreased the fatigue resistance for both cements (U200 542.63>U200/HF-Tc 495.00; MA 544.47>MA/HF-Tc 506.84). Comparing the cements associated with HF or Tc, there was statistical superiority for MA (U200-Tc 537.37Conclusion:HF etching plus silane agent increased the ceramic surface free energy and its wettability, but it did not provide better results in terms of fatigue resistance compared with silane agent application only. The association of HF etching and aging significantly reduced the fatigue resistance of the material, regardless of the resin cement used. |
| Databáze: | OpenAIRE |
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