Flexural Strength Properties of Five Different Monolithic Computer-Aided Design/Computer-Aided Manufacturing Ceramic...

Current dental practices rely on monolithic ceramics for restorations, but differences in mechanical properties remain unclear. Prior research has shown that materials like zirconia and lithium disilicate are used for their strength, but no prior work had resolved how these materials compare in a direct in vitro setting. This gap motivated a study to evaluate their flexural strength and reliability. Established knowledge includes the use of Weibull modulus to assess material variability, but this paper's contribution is a direct comparison of five specific CAD/CAM ceramics. No prior work had resolved the performance of high-translucency zirconia versus other ceramics in a controlled setting. The need for precise mechanical data in dental applications is well recognized. This paper adds clarity to material selection by focusing on flexural properties. The absence of comparative data on these five materials created a need for this investigation.

The aim of this in vitro study is to evaluate and compare the flexural strength and Weibull modulus of five monolithic CAD/CAM ceramic materials. The specific problem is the lack of direct comparative data on these materials in a controlled setting. The motivation stems from the need to guide clinical material selection based on mechanical performance. The study addresses the uncertainty in how high-translucency zirconia compares to other ceramics. No prior work had resolved the variability in flexural strength across these materials. The study seeks to clarify which materials offer superior mechanical reliability. It also aims to quantify differences in flexural strength values. This investigation provides data to support evidence-based decisions in dental restoration material selection.

The study involved fabricating 50 ceramic specimens, with 10 from each of five materials: lithium disilicate, zirconia-reinforced lithium silicate, leucite-based glass ceramic, and two zirconia-based ceramics. Each specimen was 4 mm wide, 2 mm thick, and 16 mm long. A universal testing machine was used to perform the flexural strength test. The Weibull modulus was calculated using the two-parameter Weibull distribution function. Statistical analysis was conducted using one-way ANOVA and post-hoc Tukey's test. The testing machine applied a controlled load until specimen failure. Data collection focused on measuring the maximum force before fracture. The Weibull analysis assessed the variability in flexural strength across materials.

Suprinity had the highest Weibull modulus value, indicating the least variability in flexural strength. Empress CAD had the lowest Weibull modulus, suggesting greater variability. One-way ANOVA revealed significant differences in flexural strength among the materials (p<0.05). Post-hoc analysis showed significant differences in flexural strength between all groups. Zenostar had the highest mean flexural strength at 1033.90 MPa. Empress CAD had the lowest mean flexural strength. The results suggest that material composition affects mechanical reliability. The data support the hypothesis that zirconia-based ceramics perform better in flexural tests.

The authors stated that high-translucency zirconia outperformed other ceramics in flexural properties. They proposed that this material may be preferable for clinical use due to its superior strength. The findings suggest that zirconia-based ceramics have better mechanical reliability than lithium disilicate or leucite-based ceramics. The Weibull modulus values indicate that Suprinity has the most consistent performance. The data support the claim that material composition significantly affects flexural strength. The authors did not assign essentiality to any material but emphasized the observed differences. They suggested that these results may guide clinicians in material selection. The conclusions are based solely on the observed data and statistical analysis.