This used to be easier with Omnicam without the autofiltering function of Primescan. This case was difficult to correlate because there were only abutments. Key Points. Helpful to sandblast any metal surface you'll be scanning to reduce reflection. Scan the partial denture in Gingival mask, and make sure to get the intaglio surfaces that will be in contact with the crown. Smooth away any show-through of the crown design through the gingival mask borders. This does work well for cast metal partials with rest seats, etc. But these cases only appear once a year for me.