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The opinions within this web page are not ours. Authors have been credited
for the individual posts and photographs where they are. - www.rxroots.com

endo, post and recycling of a 20 year old crown

From: Marga Ree
Sent: Wednesday, October 04, 2006 2:30 PM
To: ROOTS
Subject: [roots] endo, post and recycling of a 20 year old crown

This patient has been in our practice for more than 20 years. 
In 1985, all old amalgams  were removed and replaced by PFM crowns. 
Apart from 2 Class V restorations on the buccal side of tooth 34 
and 36, it has been functioning without any problems till last
week, when the crown on # 35 snapped off, see picture.

I did the endo today, and after removing the dentin and amalgam 
from the crown, and judging the remaining ferrule, I decided to 
recement the crown after finishing the endo.

I placed a fiber post (a tapered FibreKleer by Pentron) with 
LuxaCore, and made the build-up of the same material. I used the 
existing crown as a mold, after lining the inner surface 
with vaseline. After removal of the crown, I removed the surplus 
of composite core material that had been flowed in the interdental 
space. I checked the occlusion, and after a minor adjustment, 
the crown was recemented.

Despite the fact that the esthetics are not optimal, this patient 
has been very satisfied with the PMF crowns. Nowadays we would 
make it differently, with occlusal porcelain and no bevel on the 
buccal side.

But, it is very rewarding to see that your work is still in place 
and functioning well after 20 years. Hopefully it will last 
another decade !! - Marga

Marga, well done, endo-post look great. Maybe you could have just cemented the crown with the buildup material, no Vaseline, no recement ? - Danny Thanks Danny, The reason I like to do this in 2 steps is extra control. You cannot prevent that composite will also flow over the cervical dentin, below the crown margin, and in the interdantal space. When I have removed the crown, I check the margins and remove the surplus of composite with an US tip. I check the build-up, adjust it if necessary, I check the fit of the crown, the occlusion, and when everything is OK, I cement the crown - Marga CLAP....CLAP.....CLAP...I like your work.... I really appreciate your online classes ...and your judgement in your cases... Tks for sharing it with us in the same day you have done!!! May I have you authorization to show it to my students??? - Marcia Vieira With the marginal fits you have on those, they’ll go another 20. hope to see you and paul in vegas in a couple of weeks - Gary Do those upper molars jave single canals? - Jason Highly likely Jason, see rads - Marga

Marga, I have in the past occasionly had trouble removing a crown when vaseline was used as a seperator. I now flash the inside of the crown with a very thin layer of baseplate wax, seems to be easier to remove the crown - DanS

K 3 lightspeed

Crown replacement

Root reinforcement

Vertical root fracture

Periodontal pocket

Cox crapification

Cold sensitivity

Buccal sinus

Nikon 995

Distal canals

Second mesial canal

Narrow escape

Membrane

Severe curvatures

Unusual resorption

Huge pulpstone

Molar access

Perforation repair

Maxillary molars

Protaper shaping

Pulsing pain

Apical periodontitis

Mesial middle

Isthmus protocol

Fragment beyond apex

Apical trifurcation

Jammed K file

Mesial canals

Irreversible pulpitis

Bicuspid abscess

Sideways molar

Red Dye allergy

Small mirrors

Calcified molar

Extraction and implants

Calcificated central

Internal resorption

Bone lucency

Porcelain inlay

Bone allograft