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Publicação
Slurry preparation methods affect dental porcelain reliability
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Resumo(s)
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.
The purpose of this study is to evaluate the effects of 2 mixing techniques on the biaxial flexural strength and microstructure of dental porcelain.
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 (a=.05).
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.
Specimens produced by the incremental mixing technique showed higher biaxial flexural strength than one-step mixing.
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Cerâmica Indústria cerâmica Medicina
Contexto Educativo
Citação
Pelaez-Vargas, Alejandro... [et al.] - Slurry preparation methods affect dental porcelain reliability. In: The Journal of Prosthetic Dentistry, Vol. 105, Issue 5 (May 2011), p. 308-314