Flexural strength of fluorapatite-leucite and fluorapatite porcelains exposed to erosive agents in cyclic immersion.
| Autor: | Junpoom P; Section of Dental Public Health, Huay Yod Hospital, Trang, Thailand., Kukiattrakoon B, Hengtrakool C |
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| Jazyk: | angličtina |
| Zdroj: | Journal of applied oral science : revista FOB [J Appl Oral Sci] 2011 Apr; Vol. 19 (2), pp. 95-9. |
| DOI: | 10.1590/s1678-77572011000200003 |
| Abstrakt: | Objective: The aim of this study was to evaluate the flexural strength of two porcelain materials (IPS d.SIGN and IPS e.max Ceram) exposed to erosive agents. Material and Methods: One hundred and twenty bar-shaped specimens were made from each of fluorapatite-leucite porcelain (IPS d.SIGN) and fluorapatite porcelain (IPS e.max Ceram) and divided into 8 groups of 15 specimens each. Six groups were alternately immersed in the following storage agents for 30 min: deionized water (control), citrate buffer solution, pineapple juice, green mango juice, cola soft drink and 4% acetic acid. Then, they were immersed for 5 min in deionized water at 37ºC. Seven cycles were completed, totalizing 245 min. A 7th group was continuously immersed in 4% acetic acid at 80ºC for 16 h. The final, 8th, group was stored dry at 37ºC for 245 min. Three-point bending tests were performed in a universal testing machine. The data were analyzed statistically by 2-way ANOVA, Tukey's HSD test and t-test at significance level of 0.05. Results: The flexural strengths of all groups of each porcelain after exposure to erosive agents in cyclic immersion did not differ significantly (p>0.05). For both types of porcelain, dry storage at 37ºC yielded the highest flexural strength, though without significant difference from the other groups (p>0.05). The flexural strengths of all groups of fluorapatite porcelains were significantly higher (p<0.05) than those of the fluorapatite-leucite porcelains. Conclusions: This study demonstrated that the erosive agents evaluated did not affect the flexural strength of the tested dental porcelains. |
| Databáze: | MEDLINE |
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