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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

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

Revista

Título: Journal of Prosthetic Dentistry

Vol. 105

Páginas: 308-314

ISSN: 0022-3913

Editora: Elsevier

Indexação

ISI Web of Knowledge - 3 Citações

ISI Web of Science

Scopus - 3 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Outras ciências da engenharia e tecnologias

Outras Informações

ID Authenticus: 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)

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7