Unknown ancient implant: can you identify it?
I have a new patient who presents with an implant installed 20-years ago in Wales in the United Kingdom. I have not been able to identify it (I tried whatimplantisthat.com already). Does anybody recognize this implant? Any ideas?
18 Comments on Unknown ancient implant: can you identify it?
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PeterFairbairn
9/17/2015
Could be an IMZ which were popular then ...
Peter
Maciej Wozniak
9/17/2015
Thank you PeterFairbairn for response.
I sent this problem on 3 diferent forums and have 50/50 resopnses between IMZ and Zimmer. Zimmer tech department said that it looks like old Calcitec 3.25 Omniloc implant.
Hope to find out which one it is before ordering components :)
regards
maciej
BigSilvo
9/18/2015
An old Zimmer Calcitek? Try whatimplantisthat.com
Patrick
CRS
9/20/2015
Mesopotamia 3rd century. Actually I agree with Peter or it could be an old Calcitec I placed these twenty years ago. Hopefully you can get parts. Perhaps order both and send back what is not used.
Gregori Kurtzman, DDS, MA
9/22/2015
The IMZ had oblong apical holes. This is a Calcitek omnilock implant
http://whatimplantisthat.com/implant/omnilock/
Mark Montana
9/22/2015
Agreed, it looks like an Omnilock (Calcitek's first try at an anti-rotation connection). Terribly designed interface.
Wayne Simmons
9/22/2015
Calcitek , press fit, looks like a pfm cemented short of the margin .
Great integration for the first 2 to 3 years. Then sloughing of the coating causing peri implantitis and osseointegration cupping.
Maciej Wozniak
9/23/2015
Thank you everybody for your suggestions,
Wayne, what do you mean by press fit? Is it one like in bicon or should I be able to remove it using just a correct driver? BTW have they changed drivers or can I ask ? Zimmer for a current one for this job?
Maciej
Gregori Kurtzman, DDS, MA
9/23/2015
Pressfit refers to a smooth bullet shaped implant with no threads on the body these where pressed into the osteotomy and had to be HA coated to get integration that would resist loading forces after integration. these designs went out of favor years ago due to the much higher failure rate. Bicon is not the same as it is a finned design where bone grows between the fins
Wayne
9/24/2015
Already answered, but press fit was a tap in or push in implant. Calcium hydroxyl appetite coating was what sloughed. The coating was thought to be advantageous in creating a rapid integration , but studies showed a three year decline in success. Many were removed and replaced .
Wayne
Gregori Kurtzman, DDS, MA
9/24/2015
The reason the pressfit needed to be HA coated was implants manage loading very well in compressive loading but poorly in shear. when the surface is parallel to the load the interface is under only shear loading. by HA coating the surface they got better integration to be able to better manage the shear loading but as you indicated HA coating in the 80's was less crystaline and tended over time to dissolve also sometimes it would shear off the implants titanium. when threaded implants were shown to manage loads better place allow better initial stability the pressfit designs disappeared.
Dr Bob
9/23/2015
What do you want to do with this implant? It looks like it is holding up quite well after 20 years. Is the crown and the connection to the implant still tight? Parts for the implant may not be available any longer. Could you try preparation of the existing crown and impression to make a new crown to fit over your new preparation? If the abutment connection is still good this may be a solution for this case. It does look like IMZ.
PeterFairbairn
9/23/2015
Yes the internal does not IMZ as well ........ shoot all I remember from those days was cementing hex abutments in ,,,,,, and them coming out !!!!
Maciej Wozniak
9/23/2015
Dr Bob, Crown is slightly mobile but I can't take it out with reasonable force . I suspect that internal screw is loose so it make sense to me to get matching driver, cut the crown, torque abutment to 30 Ncm and take the impression for new crown from abutment level. Alternatively may consider new internal screw if the old one is worn down and Zimmer keep them in stock.
Gregori Kurtzman, DDS, MA
9/23/2015
The screw would be a 048 hex. you will need a new screw for this contact Attachments.com they should be able to provide a replacement screw. I think you will need to cut the current crown off with a pressfit i would not be trying to tap the crown off as you may find the crown out but the implant attached to it. Have to be careful when tightening the new screw that you do not turn the implant or you may easily break the integration and have a failed implant so you will need to grab the abutment with locking hemostat and hold it tight to prevent any rotation as you tighten the new screw.
mpedds
9/24/2015
Looks like Calcitek to me. I restored a number of these - late eighties, early nineties maybe? I agree with previous post the HA coating was believed to be unique and great at the time but in some cases the coating failed. Don't remember the type of screw, some of these had a slot-head screw in those days. Parts are still available.
Gregori Kurtzman, DDS, MA
9/24/2015
Your right back when the Calcitek were around they were using slotted screws as torque wrenches were not being used at that point. You can can a hex screw to use on this now. Try Attachments.com
F. Shay
8/21/2017
Looks like Calcitek with HA coating.
