During the repair process, nitrogen is used to displace oxygen in the molding chamber. Or, for a more formal/scientific

During the repair process, nitrogen is introduced into the molding chamber to displace oxygen.

The second version emphasizes the action/process a bit more clearly.

• PSA Pressure Swing Adsorption Nitrogen Generator (or High-Purity Nitrogen Generator): Extracts nitrogen from compressed air through physical adsorption, typically requiring nitrogen purity of or higher.
• Atmosphere Circulation Purification System: Works in conjunction with the nitrogen generator to continuously extract gas from the forming chamber, filter smoke and trace oxygen, and then return cooled high-purity nitrogen back to the forming chamber.

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• Displacement and Oxygen Removal: Before starting the printing process, the system continuously injects high-purity nitrogen into the forming chamber to expel the air (especially oxygen) inside, reducing the oxygen content within the chamber to a safe standard (typically controlled at the ppm level).
• Safety and Quality Assurance: An inert gas environment not only prevents metal powders from undergoing intense oxidation at high laser temperatures (which would reduce the mechanical strength and cause surface defects in the finished product) but also avoids safety hazards from flammable metal powders during processing.

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• Improved Biocompatibility: Eliminates residual oxidized impurities, ensuring that dental implants do not cause rejection reactions when placed in the human body.
• Density and Precision: A good inert atmosphere promotes perfect metallurgical bonding, ensuring that dental restorations such as crowns and bridges have extremely high density and marginal fit.

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If you are evaluating the gas supply solution for dental 3D printing equipment or troubleshooting oxidation issues such as brittle or discolored prints, I can provide further assistance. Please let me know if you need to understand: