Ok, I've been asked by one of our dentist to make a couple of upper central yellow gold basket crowns. http://www.nature.com/bdj/journal/v216/n8/full/sj.bdj.2014.297.html Above are examples of such. I have a pre opp model. Any ideas on how to proceed or anyone ever made any of these before? The dentist said he will prep to my recommendation. It's not the waxup, but how I'm going to get the waxup off the prep without breaking because of the POI. His idea is to leave a window of un prepped enamel in the middle of the tooth and cut a prepared area around that. In the pics from the link above, they look to me like no prep and just wax up over the top but I was hoping for a more refined look. Any ideas?