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Medical Forum / General / Dentistry / September 2007Implants keep falling out
In March 1995, my dentist installed two implants in my lower left jaw. He put on a single crown, covering both implants. Trouble is, the crown keeps falling out every year: Twice in 1995, once in July 1996, and it just fell out again. He just keeps re-cementing it back on the implant stubs. One of the implants reaches 3 mm into the crown, the other implant reaches only 2 mm into the crown. Could this be the problem?What is the normal insertion depth of an implant into the crown? Is it normal to have a new crown fall out every year?  SignatureWalter www.rationality.net - Many implant directions recommend cementing the crowns with a temporary cement. IME, it often isn't enough adhesion to secure the crowns for long periods of time. I use a thin mix of poly-carboxylate cement. It is not as permanent as resin reinforced glass ionomer cement or other crown and bridge cements, but it will hold better than temorary cement. JMO, D > In March 1995, my dentist installed two implants in my lower left jaw. He > put on a single crown, covering both implants. [quoted text clipped - 8 lines] > > Is it normal to have a new crown fall out every year? > In March 1995, my dentist installed two implants in my lower left jaw. He > put on a single crown, covering both implants. [quoted text clipped - 8 lines] > > Is it normal to have a new crown fall out every year? 2 mm is a very minimal dimension for good retention. If it hasn't fallen out in 11 years you may wish to weigh the annoyance of periodic recementations with the lower level of retrievability with a stronger cement. If you meant to say 2005, 2006, then I would consider this excessive, and would use a stronger cement. Steve SignatureMark & Steven Bornfeld DDS http://www.dentaltwins.com Brooklyn, NY 718-258-5001 Single crown or 2 unit FPD? Possible crown over two posts? Signature/ Amatus / >> In March 1995, my dentist installed two implants in my lower left jaw. He >> put on a single crown, covering both implants. [quoted text clipped - 16 lines] > > Steve > Single crown or 2 unit FPD? > > Possible crown over two posts? Sounds like the latter. Steve SignatureMark & Steven Bornfeld DDS http://www.dentaltwins.com Brooklyn, NY 718-258-5001 This was a single unit crown, bridging the two implants. SignatureWalter www.rationality.net - > Single crown or 2 unit FPD? > [quoted text clipped - 20 lines] >> >> Steve SignaturePosted via a free Usenet account from http://www.teranews.com Does not make sense. Do you mean it replaced one missing tooth and consists of three crowns fused together? By implant, do you mean the metal post cemented into a root canal treated tooth, or do you refer to a titanium fixture which is tapped into a hole drilled in bone? Signature/ Amatus / > This was a single unit crown, bridging the two implants. > [quoted text clipped - 22 lines] >>> >>> Steve Hi Amatus In 2005 my "implantologist" placed 2 titanium fixtures into the bone where my lower left pre-molars used to be. (I am 80 YO). He then placed a single crown on top of the implants, bridging both implants. The darned crown falls off every year. I'll ask him today if he can unscrew the old posts from the titanium implants and replace them with longer ones. This might provide a deeper seating of the posts in the crown. I'll let you know. SignatureWalter www.rationality.net - > Does not make sense. > [quoted text clipped - 31 lines] >>>> >>>> Steve SignaturePosted via a free Usenet account from http://www.teranews.com >Does not make sense. I have seen this. Two fixtures supporting a single piece replacing two teeth. It was like about a molar and a half, or two large bi-s >Do you mean it replaced one missing tooth and consists of three crowns fused >together? > >By implant, do you mean the metal post cemented into a root canal treated >tooth, or do you refer to a titanium fixture which is tapped into a hole >drilled in bone? Thin that the superstructure is coming off. If cemented use a stronger luting agent, horizontal retention grooves can be added. Two units of crowns splinted together which keep falling off. Try a stronger cement, like Henry suggests. If you have to re-do the abutments, the crowns will need to be re-made. Perhaps adding grooves and re-lining the crowns with acrylic prior to re-cementing? Signature/ Amatus / > >>Does not make sense. [quoted text clipped - 14 lines] > If cemented use a stronger luting agent, > horizontal retention grooves can be added. > Two units of crowns splinted together which keep falling off. Try a > stronger cement, like Henry suggests. If you have to re-do the abutments, > the crowns will need to be re-made. > > Perhaps adding grooves and re-lining the crowns with acrylic prior to > re-cementing? An engineering solution ;-) would be to roughen up the posts, from the gums up, to provide a "key" for the cement to get a better grip. Amatus, that's probably what you mean by grooves - around the posts. RF Grooves would be notches cut into the side of the abutments. Image the space left behind by removing a length of pipe from the surface of a concrete piling after the cement hardens. It leaves a negative space the length of the piling and semicircular to 3/4 circular. On a dental abutment, this increases the surface area in contact between the crown and the abutment. Therefore, increasing the friction between the crown and abutment, and increasing retention (assuming the crown has a component on its internal surface to fit the notch. Signature/ Amatus / >> Two units of crowns splinted together which keep falling off. Try a >> stronger cement, like Henry suggests. If you have to re-do the [quoted text clipped - 8 lines] > > RF > Grooves would be notches cut into the side of the abutments. Image the > space left behind by removing a length of pipe from the surface of a [quoted text clipped - 5 lines] > crown and abutment, and increasing retention (assuming the crown has a > component on its internal surface to fit the notch. Hello ....Seems like we have an engineer and a dentist all in one. :-) Not a bad combination, I'd say. Good choice. RF > On a dental abutment, this increases the surface area in contact between > the crown and the abutment. Therefore, increasing the friction between > the crown and abutment, and increasing retention (assuming the crown has a > component on its internal surface to fit the notch. Now my Canadian two cents (which today is about equal to two cents American...who would have thought that would ever happen?).....Your last point is very important. If the abutments cannot be made longer, then this notching *might* help, but new crowns would need to be fabricated. I wouldn't want anyone to think the old crowns can be used after the notching.....If they were reused, I don't think they would stay on any longer (and maybe even a lesser time period). John I agree. As a temporary measure, I have (in the past) relined the crown with acrylic until we could re-make it. Today,,,,,,,,,,, I do CEREC crowns which are much less dependent on the length of the abutment if it is natural tooth structure. Implant abutments still need adequate height or extra surface area (or re-designed with a retention screw through the crown.) Signature/ Amatus / >> On a dental abutment, this increases the surface area in contact between >> the crown and the abutment. Therefore, increasing the friction between [quoted text clipped - 10 lines] > > John I don't know where my brain was when I typed this post. I should have said, the implants were placed in 2005. They fell out in 2005 , 2006 and 2007. Sorry for the confusion. SignatureWalter www.rationality.net - > In March 1995, my dentist installed two implants in my lower left jaw. He > put on a single crown, covering both implants. [quoted text clipped - 8 lines] > > Is it normal to have a new crown fall out every year? SignaturePosted via a free Usenet account from http://www.teranews.com |
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