| Autor: |
Paulo Sudré, João, Andrea Salvio, Luciana, Baroudi, Kusai, Salles Sotto-Maior, Bruno, Luís Melo-Silva, Cláudio, Souza Picorelli, Neuza Maria, Sudré, João Paulo, Salvio, Luciana Andrea, Sotto-Maior, Bruno Salles, Melo-Silva, Cláudio Luís, Souza Picorelli Assis, Neuza Maria |
| Předmět: |
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| Zdroj: |
International Journal of Prosthodontics; Mar/Apr2020, Vol. 33 Issue 2, p212-216, 5p, 1 Color Photograph, 1 Chart, 2 Graphs |
| Abstrakt: |
Purpose: To evaluate the effect of different concentrations of hydrofluoric acid (HF) on the surface roughness of a ceramic reinforced by lithium disilicate and on the bond strength formed between the ceramic and self-adhesive resin cement.Materials and Methods: A total of 100 disks of IPS e.max Press ceramic (Ivoclar Vivadent) reinforced by lithium disilicate were prepared as follows: group 1 remained untreated (control group); in groups 5-20, 5-40, and 5-60, the surfaces were etched with 5% HF for 20, 40, and 60 seconds, respectively; in groups 10-20, 10-40, and 10-60, the surfaces were etched with 10% HF for 20, 40, and 60 seconds, respectively; and in groups 10-20P, 10-40P, and 10-60P, the surfaces were etched with 10% HF for 20, 40, and 60 seconds, respectively, followed by treatment with 37% phosphoric acid for 5 seconds. Surface roughness and bond strength were analyzed with confocal microscopy and microshear testing, respectively. The values obtained were statistically analyzed using paired t test and two-way ANOVA followed by Tukey post hoc test at a 5% significance level.Results: Surface roughness was influenced by the concentration and exposure time of acid applied (P < .05) and by the combination of these two factors (P < .05). Treatment with 10% HF for 40 seconds (group 10-40) achieved the highest roughness value. In contrast, bond strength was affected only by the acid exposure time (P < .05).Conclusion: Conditioning of lithium disilicate ceramics can change the surface morphology, thereby affecting bond strength with resin cement. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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