Abstract
Chipping remains a big challenge during the clinical application of glass ceramics in dentistry. The fabrication procedure used affects the mechanical properties of dental feldspathic porcelain and is associated with technical failures. This study aimed to compare the effect of the use of manufacturers’ liquids versus H2O on the flexural strength of glass ceramics. Specimens (n = 120, n = 15 per group) (25 × 4 × 1.2 mm) were obtained using four porcelain powders (Creation CC, IPS InLine, Noritake EX-3, and Vita VM 13). Four groups were produced using porcelain powder and modeling liquid, and four groups using distilled water. The specimens were fired, sintered, and polished. Flexural strength was measured using a universal testing machine. Statistical analyses were conducted using post hoc Tukey’s, two-way ANOVA, and Weibull analysis. Flexural strength values (mean ± SD) of the ceramic-manufacturer’s liquid mixture ranged between 67.2 ± 10.2 and 85.8 ± 12.8 MPA (NR < VT < IV < CR), while flexural strength values of the ceramic–water mixture were between 72.2 ± 6.9 and 95.2 ± 12 MPA (CR < NR < VT < IV). While the choice of the ceramic type significantly affected flexural strength, the use of water vs. manufacturers’ liquid showed in almost all cases no significance. To achieve better flexural strength results, InLine should be used with distilled water mixtures, while all ceramic powders except for Noritake can be used with the manufacturer’s liquid mixtures.
Highlights
Dental feldspathic porcelains are silica-based ceramics that consist of an amorphous glassy matrix with dispersed leucite particles [1,2]
As dental ceramic manufacturers and technicians have different recommendations and techniques on handling ceramics, it is not necessarily proven if slurry paste preparation is clinically advantageous to the sintered porcelain quality
The results showed that when porcelain powder was incrementally mixed into liquid, a higher bi-flexural strength was achieved [8]
Summary
Dental feldspathic porcelains are silica-based ceramics that consist of an amorphous glassy matrix (potassium aluminosilicate) with dispersed leucite particles [1,2]. As dental ceramic manufacturers and technicians have different recommendations and techniques on handling ceramics, it is not necessarily proven if slurry paste preparation is clinically advantageous to the sintered porcelain quality. Porcelain powder has its particles distributed in a characterized size to yield a maximum density of particles Such variation in particle size is critical to slurry application and sintering in terms of volumetric changes, and structural properties [9,10]. Dental technicians use different techniques to mix porcelain powder and liquid to produce porcelain slurry paste. The null hypothesis tested was that mixing ceramic powders, with either the corresponding manufacturer’s liquid or water, would not have a significant effect on the flexural strength of leucite ceramics
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