Selective laser melted Co-Cr alloy copings/bridges superior fit/precision .
The selective laser melting process is an additive manufacturing process, where the parts are constructed layer by layer in the 3D shape, based on the CAD file, directly from the alloy chosen without additional binder agent use. The parts from Co-Cr alloy manufactured by selective laser melting process have the density of 99.9%, without porosity and inclusions, high hardness, high yield strength, are biocompatible and they meet the geometry of the 3D CAD designed part.
The marginal area of the dental crowns and bridges is one of the key factors for the clinical success of the dental restorative prosthesis, as well as the biocompatibility, compatibility of dental ceramic masses for veneering, etc.
In vitro tests made with a 3 unit span bridge made from Co-Cr alloy for 4 manufacturing methods (casting, casting from a milled wax pattern, milled Co-Cr alloy and selective laser melted Co-Cr alloy) has revealed that selective laser melted Co-Cr alloy bridge had the best fit, the second was the bridge made by casting from milled wax pattern, the third was the bridge made by casting from manual design pattern and the fourth was the bridge made by milled Co-Cr. (reference 1)
Also the best marginal line was observed for selective laser melted Co-Cr alloy copings/bridges. (reference 2)
The Co-Cr alloy that we use, is in compliance with the following standards:
DIN EN ISO 14971:2009 Medical devices. Application of risk management to medical devices
DIN EN ISO 22674:2007 Dentistry - Metallic materials for fixed and removable restorations and appliances
DIN EN ISO 980:2008 Symbols for use in the labelling of medical devices
DIN EN ISO 1641:2009 Dentistry. Medical devices for dentistry. Materials
DIN EN ISO 9693:2000 Metal-ceramic dental restorative systems
The fit of cobalt-chromium three-unit fixed dental prostheses fabricated with four different techniques: a comparative in vitro study.
Örtorp A, Jönsson D, Mouhsen A, Vult von Steyern P.
Comparative fit of crowns of selective laser melting and wax-lost-casting method.
Li GQ, Shen QY, Gao JH, Wu XY, Chen L, Dai WA.