Adding a proximal contact to zirconia is one of the skill sets we need to make our chairside zirconia fly.  It does happen, a light contact at try-in.  My favored technique is to use GC Luster Paste Neutral.  This video will walk you through adding a contact to zirconia.  In fact, GC Luster Paste is now my first choice for adding contacts to zirconia and all ceramics.  Same technique and firing cycle.  Will save time.

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