Dan Butterman When staining and glazing a Celtra Duo crown, I've found that sometimes my assistants have a hard time holding on to them with a locking crown holder, especially on very shallow intaglio crowns. The other worry is that if they spray, they'll get glaze on the intaglio of the crown and often don't get enough glaze around the margins because of this.
I got a tip from a Dentsply Sirona Consumable rep that has worked great. We use silicone ear plugs (you can get them on amazon for around $3) and seat the milled crown on the plug. It's sticky enough that the crown doesn't fall off and it gives you something to hold onto while staining and glazing. The silicone also blocks out the intaglio from glaze getting under the crown. After glazing, you just lift it off with a cotton pliers by the contacts and put in the speedfire. I've been doing this for a few months and my assistants love it.
