Removal of Ankylos C/X hexed abutment: special tools?

Why not take an impression of the abutment and construct a regular crown if the abutment is ok? Or if you telly need to remove try using a pair of forceps to try rotating the abutment out.

why does the abutment need replacing? is it not practical to make a new crown with the original abutment?

google.... bill schaeffer dentist....and see if you can find an email address.....Bill is the ankylos expert

You've got a cold weld. Try to tap the abutment laterally then try the forceps to rotate out gently. If not use the abutment again as it doesn't look like it's ever going to budge

Use an ortho plier to grip the abutment tight , then knock on it rapidly with the mouth mirror handle. It does come out eventually.

I am very interested in this topic and I could maybe help you out. Is there a way we could discuss by email ? Marc

I cannot suggest how to remove this however I can tell you once you remove this DESS makes a compatible ankylos abutment that has a screw that is removeable so you have an alternative then from the manufacturer

It is absolutely as strong as the ankylos abutment and the morse taper strength is not generated from if the screw is welded into the abutment or not. I have a great document about the benefits of this solution if you are open minded to reading about it. As for compatibility we are 100% compatible and cannot claim compatibility without regulatory agencies in different countries who require that companies submit CAD drawings, tolerance testing, fit testing, stress testing to validate our cross compatibility. I am open to having a real discussion based on facts on each part rather than comments with no backing of true facts. I have all the engineering and regulatory approvals backing the information I provide.

sounds like you are the manufacturer. Are your components FDA approved in the US? I'm always open to discussions about "compatibility", but usually knock off companies can't get the tolerances that the original manufacturer has without patent infringement or changing the design somehow to get around the patent. If you are the manufacturer, why did you feel the need to make an ankylos abutment? Cost? The free floating screw is a nice idea however you then need to make the screw access chimney bigger to accomodate the threads of the screw. This is turn makes the abutment walls thinner through the morse taper, am I right? The Ankylos abutment only comes in one neck size so do you risk placing your abutment in the posterior part of the mouth, under higher occlusal loads? Please list your publications and documentations on the compatibility and engineering you speak of and I'm sure there are many readers who would be interested in your material. However, please make sure everyone knows you have a financial interest in the postings.

May I make a suggestion? This is how we remove Ankylos abutments when they get a little tight for us; What most people do, is they FULLY unscrew the abutment screw and then start to wiggle the abutment to loosen it. What I would suggest that you might try, is to unscrew the abutment screw, from tight - but only one single turn - so that the screw is only just loosened. Then, keeping the screwdriver in the abutment screw, wiggle the hell out of the abutment - be vigorous! Then FULLY unscrew the abutment screw and remove the abutment. The reason this often works, is that if you fully unscrew the abutment screw, you lift it out of the abutment some way, and you cannot get much leverage when you wiggle the screwdriver as the screwdriver isn't in the abutment very far. If you leave the abutment screw only slightly loosened, you are able to wiggle the abutment much more effectively - and that MIGHT be enough to loosen it from the implant. I hope that helps. Kind Regards, Bill Schaeffer

Dr. Johnson: Sorry for taking so long to get back to you. Let me answer your questions. sounds like you are the manufacturer. - yes I am with DESS. We are a Spanish manufacturer of restorative implant components and I am their US representative and our website is www.dess-usa.com Are your components FDA approved in the US? Pending FDA (anticipate by end of q1 2016). For clarification EVERY SINGLE part has to be submitted to FDA to have an FDA approved part not just one. Currently have Health Canada, CE approval and all our manufacturing complies with ISO 9000 and ISO 13485. All titanium is ASTM F136. I’m always open to discussions about “compatibility”, but usually knock off companies can’t get the tolerances that the original manufacturer has without patent infringement or changing the design somehow to get around the patent. Patents are so broad and far reaching extending well beyond the design of the connection. We are able to meet or exceed the tolerances of the original manufacturer and be compatible with our design. I have an entire section on how we do this and why we can confidentially manufacture parts that are compatible by viewing the information here http://www.dess-usa.com/faq-quality/ If you are the manufacturer, why did you feel the need to make an ankylos abutment? Cost? We sell globally through 50+ distributors and Ankylos is widely used in other countries just not so much in the USA. The free floating screw is a nice idea however you then need to make the screw access chimney bigger to accomodate the threads of the screw. This is turn makes the abutment walls thinner through the morse taper, am I right? Yes. I have detailed information on what we did here and our stress testing does not show any issue with this solution. The Ankylos abutment only comes in one neck size so do you risk placing your abutment in the posterior part of the mouth, under higher occlusal loads? In terms of the neck going into the implant yes and there are different neck heights depending on how shallow or deep the implant is placed. We have two neck heights with our Ankylos compatible line, just like Ankylos has. Please list your publications and documentations on the compatibility and engineering you speak of and I’m sure there are many readers who would be interested in your material. However, please make sure everyone knows you have a financial interest in the postings. Documentation on compatibility and engineering are proprietary documents that are part of the FDA submission and Health Canada submission. These two regulatory bodies are the only ones that require fit, tolerance, and compatibility testing on components (this is not a requirement of CE, ISO etc.) We have a section here on this topic. I absolutely have a financial interest in DESS USA. Any questions comments please contact me anytime. Always willing to help...always willing to give a straight truthful answer based on facts and not hersay , antecdotes, or FUD (fear, uncertainity, and doubt) which is unfortunately so prevalent in this industry.

Thank you for the information. I will look up the links you have provided. However I still am not sure why you decided to make a replica ankylos abutment. What was wrong with the original that you feel you can make better? I'm sure the free floating screw is a nice idea but I can't help think that it weakens the neck. The ankylos abutment with the screw has been kinown to fracture under high stress so not sure how your could improve on the strength while making the screw channel bigger. Are you using an alloy? You said you had detailed information but did not include a link. I wish you the best in your US endeavor. Dr. J

An easy way to remove a cold welded abutment is to use gently for less than a second the cold spray on the abutment.

I'm passing for the same dissapoitment situation. # 8 17x4.5 Ankylos fixture, excellent oseointegration but the crown start loosening time after the restoration was completed. Experts from Ankylos always busy with the promise to call me back, 4 times. No call at all back to help me. Now, this garbage system was sold to Sirona wich make the things worse bc they pass the ball and no one asumes responsibility. STAY AWAY FROM ANKYLOS(DENSTPLY) or SIRONA. You a re going to be in a terrible situation in front of your patients. The abutment screw can't be tighten or removed. I even pull the screw after destroying a Zirconia abutment to try to replace it. At this moment, I'm going to remove the implant with bone graft and wait for the right time to replace the implant. I'm going to use Any brand less this german supposly at the top of all.