Effect of Recasted Material Addition on the Quality of Metal‐Ceramic Bond: A Macro‐, Micro‐, and Nanostudy

Abstract

Using the recasted alloys in dental prosthetics could affect the quality of the metal-ceramic bond. However, scientists, alloys producers, and prosthetists are still of different opinions. e purpose of this study was to estimate the influence of recasting of the NiCrMo alloy on the metal-ceramic bond quality. e research was carried out on macro-, micro-and nanoscales using the threepoint bending test procedure and hardness tests as well as atomic force microscopy and SEM analyses. e SEM analyses showed good integrity of the metal-ceramic bond. e τ b index of all test samples was greater than 45 MPa. e highest values were recorded for the samples made of 50% and 100% of a brand new material. SEM analysis made after the bending test confirmed good metal-ceramic bond and exhibited adhesive-cohesive fracture. e largest hardness of metal plates was found for the samples containing 50% of the recycled material. Atomic force microscopy studies showed that the alloy containing 50% of the recycled material was characterized by the highest values of surface roughness parameters.

Structural and tribological properties of the re-casted dental NiCrMo alloy

“…Despite the great popularity of precious metal alloys, the nonprecious Co-Cr and Ni-Cr ones are often used interchangeably for dentures because of their good mechanical properties and low cost [4,5]. Due to questioning the use of nickel alloys as biomaterials and their potentially harmful effects on human tissues, nickel-based alloys are still widely used to manufacture the substructures of ceramic crowns and bridges.…”

“…They also require that the material must come from the same batch. Another group of manufacturers do not allow using remelted material (e.g., Heraeus Kulzer Co.) or do not provide any information on the use of dental alloys obtained from recycling [4].…”