message board Why So Hard to Make a Good RPD Framework? Townies help a peer improve his success rate by suggesting different materials-is alginate better?-and discussing lab communication. iluvdat Member Since: 10/02/07 Post: 1 of 66 Either framework doesn't snap in or there is a gap between metal and palate or teeth. I have tried 3 different labs and they all had different problems. ■ 12/14/2013 agsdds What impression material are you using? ■ Member Since: 01/08/03 Post: 2 of 66 12/14/2013 iluvdat Alginate. ■ Member Since: 10/02/07 Post: 3 of 66 alanrw Member Since: 05/16/11 Post: 4 of 66 12/14/2013 If the frame fits your model and it isn't abraded, you have to look at your impression technique. We use Xantalgin for our partial frame impressions. Mixes like alginate but a bit more accurate. I was using one of the most well-known labs around here for years and had nothing but trouble. They kept telling me my impressions were bad. I switched to a new lab 11 years ago. I have had to remake one frame in 11 years. Evidently, the labs with the big advertising budgets aren't always the best. ■ 12/14/2013 agsdds Member Since: 01/08/03 Post: 5 of 66 Polyvinyl should yield a much more accurate impression and therefore better model for the lab. Alginate imp just for Dx cast and RPD design. Works OK for flippers too, but I wouldn't count on it for creating a metal framework. There's my two cents. Good luck. ■ 12/14/2013 velogeek Member Since: 04/15/10 Post: 6 of 66 Irreversible hydrocolloid (alginate) hands down for RPD impressions. But, you need to make a custom tray. Remember it's the most accurate under compression, so never use stock perforated trays. We also use a monojet syringe to capture rest seats and add to the vestibule. ■ 12/14/2013 Honey Badger Member Since: 03/27/09 Post: 10 of 66 Why exactly is alginate better for RPD impressions? My only hesitation with switching to alginate (from polyether in custom tray) is that then I'm on the hook for pouring up the impression and I don't have a fast, predictable way to pour a model without distortion. Beading and boxing drove me nuts in school. Maybe I'll give that alginate-in-a-bowl method of boxing another try. Any other ideas? ■ 12/14/2013 velogeek Member Since: 04/15/10 Post: 13 of 66 34 Hydrophilic, adapts to the teeth and soft tissue better than PVS, and it's more hydrophilic when set, and thus you get a more accurate and "smoother" surface cast. And you can take JUNE 2017 // dentaltown.comhttp://www.dentaltown.com/MessageBoard/thread.aspx?a=11&s=2&f=218&t=218124&g=1&st=Why%20So%20Hard%20to%20Make%20a%20Good%20RPD%20Framework? http://www.dentaltown.com