| Title | The effect of slurry preparation methods on biaxial flexural strength of dental porcelain |
| Publication Type | Journal Article |
| 2011 |
| Authors | Pelaez-Vargas, A, Dussan, JA, Restrepo-Tamayo, LF, Paucar, C, Ferreira, JA, Monteiro, FJ |
| Journal | Journal of Prosthetic DentistryJ. Prosthet. Dent. |
| Volume | 105 |
| Issue | 5 |
| Pagination | 308 - 314 |
| Date Published | 2011/// |
| 00223913 (ISSN) |
| article, chemistry, comparative study, Complex Mixtures, Crowns, dental care, Dental Porcelain, Dental Prosthesis Design, Dental Stress Analysis, Dental Veneers, denture, drug mixture, evaluation, materials testing, pliability, tooth crown, tooth prosthesis |
| Statement of problem. One-step and incremental mixing procedures are currently used to produce dental ceramic pastes. In the ceramic industry, high quality is obtained using one-step mixing, but in dentistry, the best method has not been yet determined. Purpose. The purpose of this study is to evaluate the effects of 2 mixing techniques on the biaxial flexural strength and microstructure of dental porcelain. Material and methods. Feldspathic porcelain discs (2 × 15 mm in diameter) were produced and divided according to the ceramic paste preparation method, powder-liquid incremental mixing group (n=50) or one-step mixing, as a control group (n=50). Specimens were tested for biaxial flexural strength and characterized using porosimetry, relative humidity, SEM/EDS, XRD, and FT-IR analyses. Statistical analysis was conducted using Weibull statistics. The Weibull modulus, characteristic strength and relative humidity were compared between groups, using Student's t-test and Mann-Whitney U test (α=.05). Results. The powder-liquid incremental mixing group showed significantly higher values (SD) of Weibull modulus (6.74 (0.70), P<.001) and characteristic strength (79.87 (2.01) MPa, P<.001) when compared to the one-step mixing group (4.94 (0.94) and 75.95 (2.61) MPa). Significantly lower mean (SD) relative humidity values (P=.009) were found for powder-liquid incremental mixing group (20% (0.5%)) compared to one-step mixing group (22% (1%)). XRD spectra showed that the one-step mixing group produced higher amounts of the amorphous phase. Conclusions. Specimens produced by the incremental mixing technique showed higher biaxial flexural strength than one-step mixing. © 2011 The Editorial Council of the Journal of Prosthetic Dentistry. |
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