THE EFFECT OF SLURRY PREPARATION METHODS ON BIAXIAL FLEXURAL STRENGTH OF DENTAL PORCELAIN

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Pelaez Vargas, A (Author) Other; Dussan, JA (Author) Other; Restrepo Tamayo, LF (Author) Other; Paucar, C (Author) Other; Ferreira, JA (Author) Other; Fernando Mendes Monteiro (Author) FEUP

Journal

Title: Journal of Prosthetic Dentistry

Vol. 105

Pages: 308-314

ISSN: 0022-3913

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 3 Citations

ISI Web of Science

Scopus - 3 Citations

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

Other information

Authenticus ID: P-002-RT3

DOI: 10.1016/s0022-3913(11)60058-9

Abstract (EN): 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 x 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 (alpha=.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. (J Prosthet Dent 2011;105:308-314)

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7