Re: Post Crowns

Aosmosis wrote:

"Amatus Cremona" <Nicola@xxxxxxxxxxxxxx> wrote in message news:Ojzpf.43482$Zv5.39522@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Forget the posts once you graduate. If the crown was going to fall off without it, the tooth is doomed anyway. You may need to perform the P&C during school to impress the instructors. I personally, like making the core part of the onlay or partial crown, but no post.




I did my first one last week using the parapost system. We did the theory over a year ago.

I was really scared of causing a root fracture whilst trying to enlarge the canal with the parapost burs, so I went really slow. The prep took an hour.


The tooth was LL5. The mesial aspect was subgingival.

I placed a 1.2mm shoulder buccally and 0.5mm chamfer palatally. In the end, the ferrule I created was wafer thin. My instructor told me it was a loose loose situation (through no fault of my own)

as if I had left those wafer thin walls in place it would have fractured during the casting process.
Without a ferrule you increase the incidence of root fracture or post crown failure.

In the end he told me to make sure that the post and core was made from a non precious metal, so that it can be sandblasted and etched for bonding with Panavia.

I want to try different techniques such as the indirect-direct technique (the building up with duralay)




You're unlikely to fracture a root by preping it. Never force the drill.
One thing you may do (I have): you may enlarge a canal in a curved root and cause a perforation even if you aren't off line. This is most likely to happen on the distal aspect of mesial roots of lower molars and palatal aspect of buccal roots of upper molars, as well as premolars.
I have not totally abandoned posts myself, though I certainly am more circumspect about their use than I used to be.

Steve

--
Mark & Steven Bornfeld DDS
http://www.dentaltwins.com
Brooklyn, NY
718-258-5001
.

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