Tips on how to make flush margins for acrylic temporary crowns?

[Neil45]

I'm kinda struggling with this especially for interproximal margins. I seem to get one-way catches most of the times for my temp. Can anyone here share some insight into how to achieve flush margins? Thank you!

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[Genemyers]

There are following two tips that I can provide for flush margins:
1) It is very important to perform proper polishing while preparing crowns. Use wax and then polish gingival margin. This will add a support and will help in avoiding over polishing.
2) Using sharp blade remove gingival margin which allows extra bolk in Provisional material. This helps in effective crowing.

 

[UCSD6]

a nice provisional, is much easier to make when you have a nice prep, with no undercuts and a nice identifiable finishline. As long as you can see the finishline on the provisional you should be able to achieve great marginal seal. Sharpen a pencil, u want the tip real sharp, and mark the finishline with the pencil. This way you can see clearly when you are trimming, also make sure you are trimming correctly. The acrylic bur should run parallel to what you're trimming not perpendicular.

 

[D.D.S.]

Given that your prep has enough clearance for the provisional material, I have found that a nice template is the key. Putty with a light or medium bodied PVS wash works for me. This is an expensive way, however it requires minimal to no adjustments..

 

[diasIItema]

Using the silly putty method works really well for me. If you have a good prep, you should be able to just make a really accurate matrix to where the margin is basically set in acrylic and all you have to do is taper it on slow speed. Just make sure the plastic is very clear over the flame, set it on the the prep and be sure to press well occlusally and around the gingiva/interproximal. Set the acrylic mix in the matrix after it has set a little bit to avoid voids, and then do the standard tease, etc.

Might require a little bead brushing it you're overzealous with the trimming, but my margins are the best part of my temps, I think.