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Another exercise

 
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john kanca



Joined: 14 May 2005
Posts: 6345

PostPosted: Thu Oct 16, 2008 12:30 pm    Post subject: Another exercise Reply with quote

From "elsewhere":

I have few cases, that when the temporary crown or permanant crown is cemented with the tempbond, the tooth(vital tooth) is O.K.
When I cement the permanant crown with GC Fuji cement, then patient is feeling pain when they chew. one patient told me that she had sensitivity to hot and cold also. one patient said she has pain only while eating.

What could be the reason? Any Ideas?

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klinker



Joined: 24 Mar 2006
Posts: 4

PostPosted: Thu Oct 16, 2008 1:38 pm    Post subject: Another Exercise Reply with quote

Was the prep sealed prior to permanent cementation? If so, was occlusion checked after cementation?
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brad



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

PostPosted: Thu Oct 16, 2008 2:29 pm    Post subject: Reply with quote

It sounds like the cement is not cohesive with the prepared tooth.
Maybe the temporary cement is preventing the proper adhesion of the glass ionomer.
The main problem is not being on apex dental materilas website Smile
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john kanca



Joined: 14 May 2005
Posts: 6345

PostPosted: Thu Oct 16, 2008 5:20 pm    Post subject: Reply with quote

brad wrote:

The main problem is not being on apex dental materilas website Smile


Got that right!

Cool
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john kanca



Joined: 14 May 2005
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PostPosted: Thu Oct 16, 2008 5:20 pm    Post subject: Re: Another Exercise Reply with quote

klinker wrote:
Was the prep sealed prior to permanent cementation? If so, was occlusion checked after cementation?


No, I doubt that.
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jasonl



Joined: 25 Aug 2005
Posts: 272
Location: Florida

PostPosted: Fri Oct 17, 2008 7:56 am    Post subject: Reply with quote

occlusion
cement leakage/washout
pulpitis from prepping
chi out of balance
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john kanca



Joined: 14 May 2005
Posts: 6345

PostPosted: Sun Oct 19, 2008 11:51 am    Post subject: Reply with quote

Glass ionomer is tricky stuff.

It's very sensitive to moisture. GI needs moisture when setting. If the tooth is too dry when the GI is placed on it, the acid will etch away the smear layer and plugs and draw out fluid from tubules. It's not enough for the cement and the cement won't set properly. This results in gaps forming between the cement and the dentin.

Those gaps result in biting sensitivity and hot and cold sensitivity.

RMGI is less sensitive to moisture but still needs some to set properly.

Sealing the prep would eliminate all of this.
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