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    5-unit bridge

    Discussion in 'Fixed' started by McTeeth, Nov 21, 2016.

    1. McTeeth

      McTeeth Member Full Member

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      Hey Guys,

      Doing some research here for a dentist. Question...

      33-37 Bridge. 34/36 = Pontics. Objective = longevity. If draw was not an issue, would you put a stress-breaker in? Why or why not?

      I'm assuming yes, cause it couldn't hurt right, So the 33 doesn't pop off the abutment when biting.

      Thanks as always :)
       
    2. Sda36

      Sda36 Active Member Full Member

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      I would be surprised if you had draw on the 37 to 33 with the preps to proper retentive form. Never hurts to split if the case sets up well. Just MHO

      Sent from my LG-H812 using Tapatalk
       
    3. CatamountRob
      Dead

      CatamountRob Banned Member Full Member

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      I wouldn't put a stress breaker in unless it wouldn't draw or it was requested in the Rx.
      Edit: You wanted to know why. Because I think they suck.
       
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    4. Sda36

      Sda36 Active Member Full Member

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      I agree, definitely confer with the Dr...

      Sent from my LG-H812 using Tapatalk
       
    5. doug
      Inspired

      doug Well-Known Member Full Member

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      Unless you need it, no. There is no advantage and it's just a PIA
       
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    6. McTeeth

      McTeeth Member Full Member

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      Yeah, the Dr wanted me to investigate. We at case planning stage. I said I know a place where there are a bunch of geniuses in the Dental Lab field...So I came here last Laugh

      Kidding,

      Thanks everyone,
      Sean
       
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    7. Affinity
      Question

      Affinity Well-Known Member Full Member

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      Drs love the idea of stress breakers.. as a pt. I would want less crevices for food to hide...
       
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    8. doug
      Inspired

      doug Well-Known Member Full Member

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      I like that he thinks enough of you, and your knowledge, to include you in the case planning process.
       
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    9. PDC

      PDC Active Member Full Member

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      I wouldn't do a span this long without double abutting 32 and 33. Too much load for 1 abutment.
       
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    10. cipro
      Artistic

      cipro New Member Full Member

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      I would suggest to you to refer your Dr. to Shillingburg´s book and review the chapter ¨Treatment planning for the replacement of missing teeth".
      Even though it is recommended to use stress breakers in cases of peer abutments, specially on cases where a questionable path of insertion but if a good retention and resistance form is achieved, is better and easier to splint the case.
       
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    11. wwcanoer
      Veggedout

      wwcanoer Active Member Full Member

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      Over the years I had more key-ways "break" then bridges break. Another thing to consider is the patient a clincher-grinder as that can play havoc on long span bridges
       
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    12. gallagerdental

      gallagerdental Active Member Full Member

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      I guess I'm lucky- 44 years, never had a dove tail break,(stress breaker).Yes, I've had them intrude, but that is it. P.S.- I don't mean to minimize intrusion.


      Sent from my iPhone using Tapatalk
       
    13. grantoz
      Amused

      grantoz Well-Known Member Full Member

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      The Germans do them if path of insertion is a problem and then they put glue in the stress broken joint so they dont hold germs so the stress breaker isnt really destressing anything it makes sense to me this approach.I think the whole it stops overloading is bit of feel good pub science .
       
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    14. CoolHandLuke
      Fiendish

      CoolHandLuke Well-Known Member Full Member

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      more like 'my other lab refused me, tell me how high you will jump for my business'
       
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    15. wwcanoer
      Veggedout

      wwcanoer Active Member Full Member

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      I'm confessing

      Breaking keyways - operator error???

      Historically my metal frameworks were cast from silver palladium metal, W-1, with Will-Ceram baked on it. None of those broke to the best of my memory. But, when I switched to d.Sign porcelain the boss wanted a higher gold content alloy, so I switched to Aquarius for single units and Aquarius Hard for multi-units. This is where my problems started. With the W1, I was using Sterngold's small Tube Lock keyways, and when I switched to Aquarius hard I didn't compensate for the fact it was a softer metal - didn't even think about it. So about five years later, we started having bridge failures, then it was knock your head against the wall moment. Once I switched to the BPD style attachments from Preat we haven't had any problem
       
    16. gallagerdental

      gallagerdental Active Member Full Member

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      After giving it some further thought, I rarely use prefab interlocks. I cut my own. Maybe that is why I've never had any problems. And yes maybe also the type of metals I use, could be a deciding factor.


      Sent from my iPhone using Tapatalk
       
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    17. doug
      Inspired

      doug Well-Known Member Full Member

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      When I've done a dovetail type connector, I always cast one part of the bridge first, then use pattern resin to make the other piece directly in to casting. Invest, cast, it fits perfectly, and finish.
       
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    18. gallagerdental

      gallagerdental Active Member Full Member

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      I sometimes use pattern resin, but for me,the lock comes out cleaner and more precise when I use inlay wax. A little trickier, but I like the results better.


      Sent from my iPhone using Tapatalk
       
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    19. JMN
      Curious

      JMN Christian Member Full Member

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      I'd always looked at stress breakers as more of designing a failure recovery point on a poorly prepared and requested bridge than anything else. It will always be what breaks simply because it will likely be the weakest spot. This gets misinterpreted as 'see I told you it needed one'

      If it will draw, I'd do it in one piece whenever possible.

      Of course, it's not my fanny on the line for your case either.
       

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