I love to let my patients have the opportunity to see their final restorations prior to final cementation, In addition to evaluating the esthetics it is important to floss the contacts and adjust the occlusion if the material allows. These can be difficult and awkward procedures with multiple restorations prior to cementation. My gut flips over when one drops off and I have to struggle to retrieve it from the back of the patient’s mouth. A quick and easy solution when working with full coverage restorations is to use Mach II die silicone as a try-in cement. Place a tiny drop of the Mach II in the crown and then seat on the teeth. The die silicone sets very quickly and holds the crowns in place so you can sit the patient up and they can admire their new smile in a mirror.
The material is retentive enough to allow you to floss between the teeth, just don’t pull the floss back up, or the restorations will come with you. I also keep the restorations in place this way when seating a large case a few units at a time. With the Mach II I can seat a few units at a time, and have the other crowns in place holding the contacts. When you are ready to remove the crowns simply flossing and puling up through the contact or grabbing the restoration with crown removers dislodges the Mach II. The Mach II can simply be peeled out of the crown when you are ready to cement, so clean up is quick and easy.