Tightened inplant which starts spinning

[Ivan]

Hello Ash! Thank you for being part of the community. this is the perfect place to seek guidance on this.

The #1 reason I have found that this happens is because the implant hits the bottom of the prep. Especially in harder bone.

To avoid this, I always prep 1.5mm beyond the desired implant length. Can you tell us a bit more bout the case? Any x rays to share?

Would love to hear if @suredds or @javohiros has experienced something similar and what their take is on it.

• This reply was modified 2 weeks, 5 days ago by  Ivan.

[javohiros]

Hey guys just my 2 cents here:

I prefer to go slightly deeper even with a BLT implant (others may classify this as subcrestal) and to obtain this I usually leave an extra 1-1.5mm of space just in case. For example cbct shows 10mm depth available, so I choose an 8 or 8.5mm implant, prep the zone with guide drill to approximately 9-9.5mm, place an 8-8.5 in there but I don’t stop as soon as I reach bone level, rather I go slightly further in knowing I have extra space to work with and in the end it looks like the tip is at a total of 9-9.5mm while the connection point is about 1mm or so under bone level.

In your specific case with your example I’m assuming the implant “lost grip” because of 2 reasons: either it reached max depth and capitulated lol or most probably bone stability may not have been fully achieved after extraction surgery (maybe you didn’t wait long enough or maybe the new bone that formed there was much more spongier and thus softer than you expected)

Would love to see if anyone agrees with this or maybe they have a better explanation

[Ash]

Thank you Ivan.

Its a bone level tapered, in the posterior mandible (LR6) in a healed socket. No xrays on me. Does overpreparing work with tapered implants? Such that will a 10mm implant get good stability in a 12mm socket (as its tapered).

I think i may have overtorqued, is it possible i may have wiped out the threads in the socket?

Thank you

• This reply was modified 2 weeks, 5 days ago by  Ash.

[87madrigal]

Hi Ash, as you continue to place more implants you will run into this. Like Ivan said, the reason is because the implant just can’t go lower (even if it’s tapered it needs a bit of osteotomy). I tend to use a 11.5 drill for my 10mm implants as I like them to be a little subcrestal. When this happens just take the implant out, set it aside, drill a little deeper and you should be good to go. 🙂

[Nick]

Ok, so I always place my Neodent subcrestal. I was told that leaving the implant in the cortical layer of.bone will cause resorbption. Its important to drill deeper than you intend. It also depends on density. If I were placing a 1st molar in a healed site I would drill to 10 mm with 2.2 drill then drill to a 5.0 at 8mm then place a 5×8. I have found that this will allow me to get the 1mm subcrestal. I have had spinners. Its important to remember that a spinner will integrate. I’ve been burned too many times with putting healing abutments on immediately. <div>

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[Ash]

Thanks all

My intended length was reached, it was just strange because the implant reached the intended length (subcrestal), and at 30ncm torque, but then on the last turn of the wrench it became a spinner. Thats what i didn’t get, i thought maybe i overtorqued and wiped out the threads of the site.