Hydrofluoric acid concentrations: Effect on the cyclic load-to-failure of machined lithium disilicate restorations

Dental Materials : Official Publication of the Academy of Dental Materials
Catina ProchnowLuiz Felipe Valandro

Abstract

To evaluate the effects of the etching with different hydrofluoric acid (HF) concentrations on the cyclic load-to-failure (CLf) of machined lithium disilicate crowns cemented to dentin analogue material. Pairs of dentin analogue prosthetic preparations and lithium disilicate ceramic crowns with simplified and standardized designs were machined (n=18). The preparations were etched with 10% HF (60s), followed by primer application. The intaglio surface of the ceramic crowns was treated as follows: non-etched (control, CTRL); or etched for 20s with different HF concentrations - 3% (HF3), or 5% (HF5), or 10% (HF10). A silane coating was then applied onto the treated ceramic surfaces, and they were adhesively cemented to the preparations. To perform the fatigue tests (staircase approach), a hemispheric stainless-steel piston (Ø=40mm) applied cyclic loads in the center of the crowns under water (initial load: 720N; step-size: 70N; cycles: 500,000; frequency: 20Hz). Additionally, topographic, fractographic, and fractal analyses were carried out. The fatigue data were analyzed using the Dixon and Mood method. Although the topographic and fractal analyses depicted the action of HF etching altering the superficial complexity and topograp...Continue Reading

Citations

Feb 23, 2019·Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.]·Daniele AngerameGiulio Marchesi
Jul 6, 2019·BMC Oral Health·Fernando ZaroneRoberto Sorrentino
Sep 28, 2020·Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine·Kevim Bordignon GuterresBernardo Almeida Iglesias
Jun 5, 2021·Journal of the Mechanical Behavior of Biomedical Materials·Rafaela Oliveira PileccoMarília Pivetta Rippe
Jul 9, 2020·The Journal of Prosthetic Dentistry·Daniela Meira AlvesGabriel Kalil Rocha Pereira
Feb 1, 2022·The Journal of Prosthetic Dentistry·Thiago Soares PortoMario Fernando de Goes

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