



@article {2233,
	title = {The effect of slurry preparation methods on biaxial flexural strength of dental porcelain},
	journal = {Journal of Prosthetic DentistryJ. Prosthet. Dent.},
	volume = {105},
	year = {2011},
	note = {Export Date: 21 November 2012Source: ScopusCODEN: JPDEAdoi: 10.1016/S0022-3913(11)60058-9PubMed ID: 21530756Language of Original Document: EnglishCorrespondence Address: Pelaez-Vargas, A.; Institute of Biomedical Engineering, Rua do Campo Alegre, 283, 4150-180 Porto, Portugal; email: alejopv@ineb.up.ptChemicals/CAS: Complex Mixtures; Dental Porcelain, 12001-21-7References: The Glossary of Prosthodontic Terms (2005) J Prosthet Dent, 94, pp. 10-92;(2008) Dentistry - Ceramic Materials, , ISO 6872 Geneva, Switzerland: International Organization for Standards; 
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},
	month = {2011///},
	pages = {308 - 314},
	abstract = {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 {\texttimes} 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{\textquoteright}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. {\textcopyright} 2011 The Editorial Council of the Journal of Prosthetic Dentistry.},
	keywords = {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},
	isbn = {00223913 (ISSN)},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-79955604181\&partnerID=40\&md5=53c0732c254214b4a53e3222fe89f4a0},
	author = {Pelaez-Vargas, A. and Dussan, J.A. and Restrepo-Tamayo, L.F. and Paucar, C. and Ferreira, J.A. and Monteiro, F.J.}
}
