Resin-based materials are fundamental to modern dentistry and widely used in restorative, prosthetic, preventive, and esthetic treatments. Their mechanical, chemical, and optical properties are critical for clinical success, influencing both functionality and esthetics. This collection highlights contemporary methods used to investigate and characterize these materials. It includes studies that explore surface properties, mechanical performance, polymerization behavior, and other important features that contribute to material advancement and clinical reliability. By showcasing advanced characterization techniques, this collection seeks to enhance our understanding of resin-based materials and support the development of more dependable and high-performing dental solutions.