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Vinod Dudhat, MDT · Owner/President at American Dental Designs, Inc.
Metal should not be cross contaminated by using same burs or stone for finishing for non precious metal...See more and semi precious or gold metal.Sand blast more in inter proximal and collar area where you can see more bubbles.Clean metal with distilled water so after evaporation of water there will be no residue from tap water. steaming after sandblasting also help for better result. Make sure you follow manufacture instruction for degassing of each metal for correct temperature and oxidation color after firing.