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Polishing preps for porcelain

 
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czeqm8



Joined: 24 May 2006
Posts: 125

PostPosted: Wed Sep 27, 2006 12:28 am    Post subject: Polishing preps for porcelain Reply with quote

Polishing preps. Is it going to decrease bond strength since there is not a rough surface? I can see its value if it can help a lab to create a better restoration from a more precise model, but does it? If it should be done, should it be a fine carbide for ultra smoothness or just a fine grit diamond?
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brad



Joined: 13 May 2005
Posts: 346
Location: Cincinnati, Ohio

PostPosted: Wed Sep 27, 2006 7:01 am    Post subject: Reply with quote

I would say that polishing preps for the reason of getting a "smoother model" is not necessary. You are adding at least 50 microns of spacer for cement and adhesive, so what's the big deal?
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philzelmanow



Joined: 26 Apr 2006
Posts: 30

PostPosted: Wed Sep 27, 2006 7:48 pm    Post subject: Reply with quote

Steve Radcliff down at Pankey said there was a study done that shows that preps that have been polished give crowns with better marginal adaptation. Don't ask me how they proved this or how it's possible. I'm just a guy relaying some info.
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czeqm8



Joined: 24 May 2006
Posts: 125

PostPosted: Wed Sep 27, 2006 9:59 pm    Post subject: Reply with quote

The spacer does not go all the way to the margin. I could see how the fit might be better, but is it really worth it?
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dsg_c1



Joined: 11 May 2005
Posts: 352
Location: mill creek, wa

PostPosted: Fri Sep 29, 2006 12:00 pm    Post subject: Reply with quote

i polish all of my preps and i think it is definately worth it.

LAB: you get better models, it is easier for them to pour, and it is definately a better fit - no question about it.

CEREC: you get less milling time, less wear on the burs, and the huge benefit for less overmilling. a smooth prep and endo mode is where cerec shines!!!!

have a great weekend,
d
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darren greenhalgh dds
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philzelmanow



Joined: 26 Apr 2006
Posts: 30

PostPosted: Sat Sep 30, 2006 8:24 am    Post subject: Reply with quote

Darren,

What do you use to polish your preps? Do you just use an ultra fine diamond? If you are using some type of polishing point, how do you get the interproxials? Thanks, PHIL
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john kanca



Joined: 14 May 2005
Posts: 6341

PostPosted: Sun Oct 01, 2006 7:51 pm    Post subject: Reply with quote

Just be sure to sandblast them when you bond the restorations in.
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dsg_c1



Joined: 11 May 2005
Posts: 352
Location: mill creek, wa

PostPosted: Mon Oct 02, 2006 8:45 pm    Post subject: Reply with quote

sorry for not getting back sooner.

yes i polish with a fine diamond everywhere i can't get a rubber cupped porcelain polisher - i like the ones from axis.

take care,
d
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darren greenhalgh dds
15130 main st suite 210
mill creek, wa. 98012
www.pacificNWsmiles.com
425.357.6400

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philzelmanow



Joined: 26 Apr 2006
Posts: 30

PostPosted: Tue Oct 03, 2006 6:25 pm    Post subject: Reply with quote

Thanks Darren, I'm going to get some fine diamonds.
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