Etude des propriétés physiques et mécaniques d’une dent restaurée périphériquement en céramique

Abstract

Today there are many biomaterials for dental use which require a thorough understanding of the physical and mechanical properties allowing the dental surgeon to provide the best possible remedy to the patient.In dentistry, the restorative organ can be an artificial tooth, a prosthesis, an implant or a filling.Once placed in the oral environment, the properties of the restoration can be modified by diet.This dissertation focused on a theoretical study of the mechanical and physical properties of different types of dental restorations with the aim of helping the practitioner choose a ceramic system according to the clinical situation encountered. Compression tests carried out on zirconia, Ni-Cr alloy, ceramic ceramic and ceramic-metallic revealed distinct mechanical performances for each material.The results of Vickers hardness tests show that zirconia has a significantly higher and more stable hardness than the Ni-Cr alloy under different loads reaching a value of around 98.99N/mm2.Ceramic-ceramic materials show better overall Vickers hardness performance under varying loads, indicating a more homogeneous structure and better resistance to deformation.In comparison, metal-ceramic materials, although exhibiting high initial hardness, are less stable under high loads.