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    Digital Partial Dentures Production

    Discussion in 'CAP-Zahn' started by BobCDT, Nov 8, 2017.

    1. BobCDT

      BobCDT Well-Known Member Full Member

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    2. zero_zero
      Drunk

      zero_zero Well-Known Member Full Member

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      How does acrylic bond to acetal ?
       
    3. BobCDT

      BobCDT Well-Known Member Full Member

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      Like CrCo, there is no bond just mechanical retention.
       
    4. 2000markpeters

      2000markpeters Active Member Full Member

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      Can you add teeth to it later?
       
    5. rkm rdt
      Artistic

      rkm rdt Well-Known Member Donator Full Member

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      great question.
       
    6. zero_zero
      Drunk

      zero_zero Well-Known Member Full Member

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      Can you weld clasps to it or fix it in any way ?
       
    7. BobCDT

      BobCDT Well-Known Member Full Member

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      There is an add-on material that enables repairs, adding new clasps and teeth.
       
    8. CoolHandLuke
      Fiendish

      CoolHandLuke Well-Known Member Full Member

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      yeah, its called cold cure lol
       
    9. BobCDT

      BobCDT Well-Known Member Full Member

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      Sorry, not cold cure. It's the same material applied hot to the existing partial. Bonds to the material through surface melting to become monolithic. Probably better than most repairs, or at least as good.
       
    10. CoolHandLuke
      Fiendish

      CoolHandLuke Well-Known Member Full Member

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      let me guess, you buy it special from Italy right ?
       
    11. cadfan
      Amused

      cadfan Well-Known Member Full Member

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      Hope your mill stat is ok ?!


      Risk rates on the packaging
      R40/20 Harmful to health! Possibility of irreversible damage by inhalation (through the
      Gases arising from the decomposition of the product)
      R42/43 sensitisation through inhalation and skin contact possible (through the
      Processing of the pieces of dust)
      R34 causes burns (material in molten state)
      R36/37 irritates the eyes and the respiratory organs (through the processing of the pieces
       
    12. CoolHandLuke
      Fiendish

      CoolHandLuke Well-Known Member Full Member

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      yeah but its FDA approved. that means its good for you.
       
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    13. 2thm8kr
      Devilish

      2thm8kr Beanosavedmysociallife Full Member

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      or at least not fatal on first contact.
       
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    14. BobCDT

      BobCDT Well-Known Member Full Member

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      Was this info from the MSDS sheet? I'm trying to get a hold of it.
       
    15. cadfan
      Amused

      cadfan Well-Known Member Full Member

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      Sorry only in German look at Risikosätze ( second page near the end ) my friend Googel will help to translate !!
      I count on you Bob if these nice Italian guys with their Berreta s come to visit me.
       

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      Last edited: Nov 9, 2017
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    16. BobCDT

      BobCDT Well-Known Member Full Member

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      Hey all,
      The issue being raised is thermal decomposition. All thermoplastic materials, of which acetal is but one example, will decompose when subjected to a high enough temperature, namely fire. Thermal decomposition is defined as the chemical decomposition of a solid material that generates gaseous fuel vapors, which can burn above the solid material. In the case of acetal, it will begin to decompose at roughly 450 F. When used in the dental lab, the acetal material is not heated about 235 F. The manufacturer is required to list the gaseous fuel vapors on the SDS. At temperatures below 450 F, the material is chemically stable and inert.
      I hope this clears the air:)
       
    17. cadfan
      Amused

      cadfan Well-Known Member Full Member

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      yes and as you know burrs are always cold especially the fast old and dry ones so at the mill its always save.
       
    18. CoolHandLuke
      Fiendish

      CoolHandLuke Well-Known Member Full Member

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      even dry running acetal i dont think you'll get temps that high, because you'd see melty stringy areas like hot cheese.pizza.
       
    19. JMN
      Curious

      JMN Christian Member Donator Full Member

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      Bob, I'm gonna be real skeptical about any claim of addability to thermoplastics being better, or at least as good, as an acrylic repair.

      None of the ones I've seen yet can be added to with less effort than remaking the whole and be able to end up with something you'd actually want to tell people you did.

      Not calling you a salesman-fibber, but I'm gonna need some proof.
       
    20. Bumfrey
      Pensive

      Bumfrey Active Member Full Member

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      TY Bob i am very interested in this. Only problem is my mill is only 4-axis :(....
       

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