Dr. No OMS
First, to answer a question in a previously posted response above, this isn't a Straumann bone level implant. Almost certain it is a regular collared implant placed at bone level. I would bet that it is a "regular neck" with a 2.8mm polished collar above the 10mm textured surface.
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To the original question, need to make sure that I have interpreted it correctly. From what you have said above, there are no signs of infection. Additionally, you have not torqued down the the healing cap to 35Ncm (either initially or subsequently.) If you have torqued down the healing cap, you "may" never be able to remove it without unscrewing (deintegrating) the implant in the softer maxillary bone. There are no anti-rotational slots or groves on the external textured surface of the Straumann regular implants. You can torque down the insertion device to help verify initial stability, but not the closure screws or healing caps - just hand tighten them (no wrench) with the spline driver.
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Pretend the above is not the case and that you have tried to loosen the healing cap as a partial measure to check integration. In doing this, the entire implant turned instead of just the healing cap. I have had two such maxillary cases with, as far as I could determine, no reason for the non-integration. I was able to remove both with just the spline or hex driver and no wrench.
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The safe method for fixing this problem is to follow the advise above. In my series of "two" whole cases, I was fortunate to have had successful outcomes not doing the above. I removed the implants at discovery and thoroughly debrided the sockets. I found no evidence of infection, but only fragments of a "very" thin, fragile and transparent membrane partially lining the socket which I removed entirely. The groves matching the threads on the implant were readily apparent in the bony socket. The bone bridge to the sinus was also intact. I did not have the option of going to a wider implant (biologic width) but probably would have if possible. In short, I then replaced the implant with a new one of the same dimensions which integrated successfully. The initial stability was >60Ncm.
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I'm not advocating that you try this even if the situation you have is exactly as mine. Just telling you what I did and the outcome. Personally, my only regret (given the outcome) was in not sending the tissue found for histologic evaluation. That would have given me a "chance" to determine, rather than just guess at it's origin.
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Good Luck!
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Dr. No