Introduction: Dental alloys structural analyses are important in order to obtain quality prosthetic pieces. The defects appeard in removable partial dentures metallic components are in connection with the casting, processing and welding. Objectives: The aim of study was to offer the casting, processing and welding optimal parameters for some long lasting prosthetic pieces. Material and Method: CoCrMo alloys were used. Alloys, different castings and metallic compounds laser and micropulse weldings were tested. Radiographic, metallographic and microhardness analyses methods were used. Results: Noninvasive analyses methods point out casting alloys structural defects, distinguish the cracks within the base material. Structural analyses present dendritic structure specific for casted alloys, non-metallic inclusions and some temporary particles. Intergranular pellicular precipitations and spherical shape compounds placed inside the crystalline graines appear on some weldings. Welded area alloys chemical composition discreetly differs from the base material. Conclusions: Dental alloys structural analyses are important for structural defects knowledge. The cracks appear mostly on base material, being caused by casting, non-adequat processing and rapid cooling welding. Keywords: CoCrMo metallic alloys, structural analyses, removable partial dentures