Comparative Evaluation of Mechanical Properties in Contemporary Prosthetic Dental Materials: Zirconia, Lithium Disilicate, and Hybrid Composites

Abstract

Background/Objective: The choice of dental prosthesis material necessitates consideration of the compromise between strength, esthetics and long-term durability. Speakers claim that monolithic zirconia, lithium disilicate, and hybrid composites are the most popular materials with different mechanical and clinical properties. The present study was conducted to compare the mechanical properties of these three materials in vitro by standardised procedures in relation to seven factors important for prosthodontic use. Methods: Ninety rectangular specimens (n = 30 per group) were prepared from monolithic zirconia, lithium disilicate, and a CAD/CAM hybrid composite. The samples were tested for flexural strength, fracture toughness, Vickers microhardness, wear, surface roughness, fatigue survival (1.5 million cycles) and marginal adaptation. ​). For reliability of zirconia, the Weibull modulus (m = 14.2) was shown to be higher than the hybrid group. Conclusion: All three materials provide specific clinical benefits. Zirconia is best suited for rear and high-stool restorations, lithium dislikes for anterior and asthetic operated cases, and hybrid composite for temporary or minimal invasive applications. Understanding the mechanical behavior of each material is necessary for evidence-based artificial decision making and improvement in long-term clinical results.