Anyone know what this is?

[doug]

Let's backup here a little bit. That abutment is a PCA abutment from Corevent. It starts life as a plastic castable abutment. You put it in the model and shape it as you see fit for an abutment. Then you cast it out of a compatible alloy so as to not create problem when cemented. You could cast it out of a nice ceramic alloy and fire porcelain to it or make your own style abutment and then a crown to fit. It is cemented into the implant. That effectively fills all of the screw threads in the implant with cement and that tiny little post is supporting all of that load. When it comes lose you have a **** show on your hands if the dentist working on it isn't aware of the prior process. A tapping screw will clean the threads of the implant and you should then be able to restore it in a more effective and appropriate manner. If you want to restore it as it is, I will mail you a plastic abutment to use as you see fit. Haven't done one in over 25 years, but the process is still out there. Edit for clarity. If a doc/lab used this process and this is not a Corevent(Zimmer),good luck.

 

[gdiddy320]

Looks like, more likely than not, that implant doesn't have threads anymore on the inside. I had heard of dentists messing up the screw channel on implants after retrieving broken screws and then resorting to drilling away the internal threads carefully and treating the prosthetics as a cemented cast post and core. It's described in this paper: http://www.joionline.org/doi/full/10.1563/aaid-joi-D-14-00269?tab=references&code=aaid-premdev Definitely not ideal but if this is how it is, the only options are to cement the thing back in (maybe sandblast the post),redo that the same way it was done, or take out the implant and put in a new one. Cementing the thing back in or making a new one would probably have it falling out in the future unless the dentist wanted to do some sort of splinted crowns/maryland bridge. It would probably be impossible to tap in new threads at this point. It's probably a good idea to ask the dentist to take a history of the implant if the patient remembers anything like a screw breaking in the past or anything like that which might help you to figure out what you're working with. The implant itself actually looks pretty healthy to me. The bone level actually looks pretty good since that type of implant (looks like a Straumann/ITI tissue level clone) is supposed to be a little above the crest of the bone. It just needs a little TLC for the gums to get healthy again.

 

[Jo Chen]

As Doug mentioned, this looks very similar to first generation Corevent in regards to the implant/abutment connection. The implant body looks much more modern though. With the Corevent system the abutment was cemented in to the implant. In the above X-ray the abutment appears not quite seated but the crown length looks good. Wonder if the crown could be separated from the abutment and the abutment be seated fully in to the implant although the post portion that seats in the implant seems a bit damaged. The implant appears to be well placed and integrated. Last resort short of removing the implant would be to treat it like a post and core at this point.

 

[hagdent]

The Corevent implants on the Whats This Implant website don't look anything like the one I have. Am I looking at the wrong ones?

 

[Jo Chen]

The connection of the abutment and implant in your case are reminiscent of the old Corevent. The implant body looks more modern