A local lab manager mentioned this idea to me, which once you think about it is so obvious yet I have rarely done it. When you finish a great restorative case…send a copy of the after photo to the lab. The technicians will appreciate seeing their careful work delivered into the mouth of a real human being.
Personally I imagine most people (even dental lab technicians :-)) will get more professional satisfaction from seeing the result in someone’s mouth and to hear how happy the person is with the results than they will from simply treating a plaster model.
You can make this even more effective if you include a before along with the after photo.