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Not sure I should even do this. Dr. wants a 3 unit lower anterior bridge. Full crown, pontic and a wing. Is this asking for trouble? I assume I would need two sprues. One attached to the crown and one to the pontic. Whenever I have tried spuening in two spot I always seem to get a line of demarcation when the material meets up from two different sprues . Any tips on how to process this case?