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Medical Forum / General / Dentistry / May 2005Why six implants??
I'm having the remaining five lower teeth extracted. There will be six implants on teeth 19,21,23,26,28 and 30. They will be connected by bars which will support an overdenture which runs from tooth 19 to tooth 30. From what I've read, six implants seems like a lot to support that overdenture. I've read cases of two or four implants supporting a lower overdenture but not six. What might contribute to the need for six implants? The reasons that an overdenture might be the treatment of choice are usually the desire to use fewer implants (than a fixed prosthesis would require, doesn't apply to you) and/or the need to use an acrylic matrix to attain good cheek and lip support. I, personally, like one more implant than I need for restorative reasons to hedge my bets against loss of a fixture, albeit mandibular anterior implants' success is above 95%. If a milled or spark-eroded bar is the retention design (a good choice from the perspective of enhanced stability and function) 4 is the minimum. Since yours will run from molar to molar 6 is not unreasonable. Is it overkill? You should obviously discuss this with your surgeon/dentist. "Overkill" was my first thought. However, I can see allowing for a possible failure of an implant. A couple of areas need bone graft. Anyway, it should be very stable if the six implants hold. > "Overkill" was my first thought. However, I can > see allowing for a possible failure of an implant. Going a bit further here: If the chances of success of a single implant are .95, the chances of complete success for two implants must be .95 X .95= .9025. Going further yet, for multiple units: Three Implants .95 ^3 = .8574 Four Implants .95 ^4 = .8175 Five Implants .95 ^5 = .7738 Six Implants .95 ^6 = .7351 As you can see, even though 95% success per unit looks like a pretty good number, the chances of complete success would seem to degrade rapidly with multiple units so (based on this math only) some extra units may indeed be worth considering if it would be more expensive to add them later. Vaughn (not a dentist!) >> "Overkill" was my first thought. However, I can >> see allowing for a possible failure of an implant. [quoted text clipped - 16 lines] > > Vaughn (not a dentist!) [But, a smart guy!] | >> "Overkill" was my first thought. However, I can | >> see allowing for a possible failure of an implant. [quoted text clipped - 18 lines] | | [But, a smart guy!] Statistically the chances of a single failure are increasing, but with an increasing # of implants the odds of success of the proposed treatment are improving. -- Roy > Statistically the chances of a single failure are increasing, but with an > increasing # of implants the odds of success of the proposed treatment are > improving. Exactly my point. "Belt & Suspenders" Just going by the numbers, a case with 3 or 4 implants that is designed to "require" every implant for the success of the case would seem to be risky. Vaughn > -- > Roy > > Statistically the chances of a single failure are increasing, but with an > > increasing # of implants the odds of success of the proposed treatment are [quoted text clipped - 5 lines] > > Vaughn REPLY Belt, suspenders, and THUMBTACKS. >> > Statistically the chances of a single failure are increasing, but with >an [quoted text clipped - 13 lines] > >Belt, suspenders, and THUMBTACKS. You forgot the staple gun. -- W_B Take out the G'RBAGE wubbabubbazG@RBAGEyahoo.com > >Belt, suspenders, and THUMBTACKS. > > > You forgot the staple gun. ...and duct tape? Vaughn >> On Wed, 27 Apr 2005 07:16:50 -0400, "Joel M. Eichen" ><joeleichen@yahoo.com> wrote: [quoted text clipped - 5 lines] > >Vaughn Right, gotta have duck tape... -- W_B Take out the G'RBAGE wubbabubbazG@RBAGEyahoo.com | Right, gotta have duck tape... | -- You got it right W_B! You a fan of the Red Green show?  SignatureRoy rem NADA to reply > | Right, gotta have duck tape... > | -- > You got it right W_B! You a fan of the Red Green show? What is that? Garrison Keillor often has an entire segment of his show that is sponsored by the "Duct Tape Council": http://prairiehome.publicradio.org/ Vaughn The original tape was called "duck tape". Was used to keep water out of ammo boxes. If you use it on hot air ducts the adhesive lets go. One of those odd things you learn on those weird public TV shows. SignatureRoy rem NADA to reply | > | Right, gotta have duck tape... | > | -- [quoted text clipped - 5 lines] | | Vaughn > The original tape was called "duck tape". Was used to keep water out of ammo > boxes. If you use it on hot air ducts the adhesive lets go. Same for hot air ducks ..... Joel > One of those odd things you learn on those weird public TV shows. > [quoted text clipped - 11 lines] > | > | Vaughn > The original tape was called "duck tape". Was used to keep water out of ammo > boxes. If you use it on hot air ducts the adhesive lets go. Actually, if you use it on *anything*, the adhesive lets go; unless you buy the "good stuff". The best I have ever found is called "stage tape" and is used in the entertainment industry. Vaughn >> The original tape was called "duck tape". Was used to keep water out of ammo >> boxes. If you use it on hot air ducts the adhesive lets go. [quoted text clipped - 4 lines] > >Vaughn Gaffers tape. -- W_B Take out the G'RBAGE wubbabubbazG@RBAGEyahoo.com >| Right, gotta have duck tape... >| -- >You got it right W_B! You a fan of the Red Green show? How did you know ?! -- W_B Take out the G'RBAGE wubbabubbazG@RBAGEyahoo.com |
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