## 4 Discussion  
This study was performed to investigate possible differences in flexural strength of different ceramic types when ceramic slurry was prepared either with distilled water, or manufactured modeling liquid. The effect of mixing ceramic powder with liquid on clinical performance during the procedure of ceramic restoration preparation is unknown. Our findings demonstrated comparable outcomes in the flexural strength of each ceramic, made either with distilled water slurry or using the manufacturers' modeling liquid. However, our results showed that different ceramics produced with distilled water had significantly higher flexural strength in the IV-water group. Conversely, among ceramics prepared using manufacturers' modelling liquids, the NRL group had significantly lower flexural strength compared to others. Similarly, [PERSON] et al. [11] reported a non-significant statistical difference between bi-flexural strength of porcelains prepared with either distilled water or manufacturers' modeling liquid. Within this non-significant difference, a 5% increase in bi-flexural strength was found when porcelains were prepared with modeling liquids. Our study, however, showed variations, with both increases and decreases in flexural strength achieved by both mixing liquids. These differences in findings, although not statistically significant, could be attributed to multiple factors, such as the difference in brands used in both studies, despite porcelain type similarity [11]. Moreover, [PERSON] et al. reported results similar to our study's, where significant differences were found between bi-flexural strength of tested ceramics, irrespective of the mixing liquids [11]. Nonetheless, all flexural strength values measured in this study are well above the ISO 6872 standard, with a minimum requirement of 50 MPa for ceramics used in metal substructures [13]. Optimizing the technical aspects of porcelain-based restoration aligns with maximizing its clinical performance and success. Clinically, chipping and fracturing of ceramic veneers are among the most frequent technical complications reported [2,3]. Of relevance, technical aspects of ceramic fabrication could influence its mechanical properties. [PERSON] et al. examined the effect of different power/liquid ratios on porosity and translucency [7]. It was found that both the liquid mixing ratio and porcelain type had a significant effect on resulting porosity and apparent density, and therefore influenced the mechanical characteristics of tested porcelains [14]. In that respect, differences in densities between the manufacturers' modeling liquids (0.9-0.94 g/cm\({}^{3}\)) and distilled water (\(p=1.0\) g/cm\({}^{3}\)) lead to variations in mixed slurry density, which consequently leads to different porcelain outcomes. Different studies showed increased density and decreased porosity when modeling liquid was used for porcelain slurry preparation. [PERSON] et al. [15] investigated  
Figure 4: Weibull parameters (shape and scale) of the various tested ceramics groups CR, IV, NR, and VT, mixed with H\({}_{2}\)O or their corresponding modeling liquids. the effects of various water powder/liquid and powder/water ratios and attributed this to the fact that a larger volume of modeling liquid was needed compared to distilled water, to achieve similar weight in the tested groups, which resulted in an increase in the density [14]. Thus, it increased the wetting of porcelain powder with modeling liquid and, therefore, the density. It was concluded that the observed increase in flexural strengths could be a result of reduced porosity and improved density of porcelain specimens [11; 15]. Flexural strength values might be influenced by material composition and microstructure, as all tested materials yielded comparable SiO\({}_{4}\) values ranging between 55% and 72%, and the microstructure of glass ceramics, e.g., crystal size, crystal volume, and homogeneous distribution, influences the mechanical properties and crack propagation matter of the material [7].