Biocompatibility according sensitization effects of human skin cannot be guaranteed, nickel leaching Minor aesthetic of finish quality due brightness and brilliance of color chemical resistance /corrosion protection Cleaning and Hot steam Substrate disinfectant Biocompatibility & Adhesion to Aesthetics/ sterilisation Wear/abrasion compatibility to solutions/ Nickel Leaching (no substrate Decorative (change/heat- resistance brass alloys thermal toxicity) resistance) disinfection 7.1.10. Alternative 10: Stainless steel (alternative substrate) Conclusion of technical economical economic feasibility: Not an alternative to coatings from chromium trioxide because: chemical resistance is depending on steel grade. Stainless steel grades with good machinability have only limited corrosion resistance due to high cycle reprocessing. Steel grades with excellent corrosion resistance are problematic in machining and processing small precision parts with complex machining geometry and result in much higher production costs and lower processing quality (increasing defectives and major increase of machining costs) chemical resistance /corrosion protection Hot steam Cleaning and Substrate sterilisation Biocompatibility disinfectant Wear/abrasion Adhesion to Aesthetics/ compatibility to (temperature & Nickel Leaching solutions/ thermal resistance substrate Decorative brass alloys change/heat- (no toxicity) disinfection resistance) depending on depending on steel grade steel grade Final Statement to metallic coating from chromium trioxide for dental and surgical hand piece-applications: For dental or surgical hand-piece applications there are no acceptable alternatives to metallic plating from chromium trioxide. None of the alternatives would fulfill the technical requirements of dental and surgical instruments.
Biocompatibility according sensitization effects of human skin cannot be guaranteed, nickel leaching Minor aesthetic of finish quality due brightness and brilliance of color chemical resistance /corrosion protection Substrate compatibility to brass alloys Cleaning and disinfectant solutions/ thermal disinfection Hot steam sterilisation (change/heat- resistance) Wear/abrasion resistance Adhesion to substrate Aesthetics/ Decorative Biocompatibility & Nickel Leaching (no toxicity) 7.1.10. Alternative 10: Stainless steel (alternative substrate) Conclusion of technical economical economic feasibility: Not an alternative to coatings from chromium trioxide because: chemical resistance is depending on steel grade. Stainless steel grades with good machinability have only limited corrosion resistance due to high cycle reprocessing. Steel grades with excellent corrosion resistance are problematic in machining and processing small precision parts with complex machining geometry and result in much higher production costs and lower processing quality (increasing defectives and major increase of machining costs) chemical resistance /corrosion protection Substrate compatibility to brass alloys Cleaning and disinfectant solutions/ thermal disinfection Hot steam sterilisation (temperature change/heat- resistance) Wear/abrasion resistance Adhesion to substrate Aesthetics/ Decorative Biocompatibility & Nickel Leaching (no toxicity) depending on steel grade depending on steel grade Final Statement to metallic coating from chromium trioxide for dental and surgical hand piece-applications: For dental or surgical hand-piece applications there are no acceptable alternatives to metallic plating from chromium trioxide. None of the alternatives would fulfill the technical requirements of dental and surgical instruments.
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