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    Digital impression scan

    Discussion in 'Fixed' started by JKraver, Sep 13, 2017.

    1. JKraver
      Tired

      JKraver Well-Known Member Full Member

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      I have a few questions, I cannot seem to get a good result from scanning the impression. I have a medit identica scanner.
      1. What percentage of cases can you impression scan with good results?
      2. What techniques do you use to improve scan ie. cutting or spraying
      3. Any tips?
       
    2. rkm rdt
      Artistic

      rkm rdt Well-Known Member Donator Full Member

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      pour a model
       
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    3. Bryce Hiller
      Daring

      Bryce Hiller Active Member Full Member

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      We have a Dental Wings Series 7, which includes an impression scanner. Began utilizing it in conjunction with our 3D printer to print our model work. The impression scanner turned out to be not-so-accurate. It was a complete disaster. Long story short, had to completely restart 20 or so C&B cases.
       
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    4. CoolHandLuke
      Fiendish

      CoolHandLuke Well-Known Member Full Member

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      lets not go down this road. DW promised the world when they set up their tiny impression box. it was not so well received as they hoped.
       
    5. JKraver
      Tired

      JKraver Well-Known Member Full Member

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      My brother insists this is the big labs go, I say models are better.
       
    6. paulg100

      paulg100 Well-Known Member Full Member

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      whats the xy accuracy of your printer? not the minimum spot size but the accuracy? and is it the same across the whole plate? does your printer manufacturer even publish it? what resin are you using, what is your post curing protocol? how is the part supported on the build plate and at what angle, how thick is the part? on and on and on. so many variables its crazy.

      Shrinkage with a good class 4 die stone is what.. 0.06%?
      good resin 0.5% with the wind blowing in the right direction and all the stars aligning?

      are the "big" labs using a 6 figure $ printer, or a bunch of ****ty form 2's?

      last case I see on a printed model was a snoring appliance like a chrome. the lab was sent a stone model. they decided to scan the model, then design digital and print a copy of the model. appliance came back on printed model. didn't go anywhere near the original plaster model.... about sums up 3d printed models for accuracy. best thing is i guess the lab didn't even bother to check it on the plaster model before sending it out.

      I'm hoping to print models for diagnostics, maybe some stuff for vacuum formed appliances etc, but crown and bridge work, id forget it for now. betime you work out that it dosent work, your going to risk loosing half your clients.
      or maybe your planning to find a select account whos prepared to go through the problems with you before letting loose on your client base?
       
    7. CoolHandLuke
      Fiendish

      CoolHandLuke Well-Known Member Full Member

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      "Big" labs such as Aurum and Argen are using very expensive printers such as the ones i have described, and small labs who want to play ball think they can get away with a bunch of form2's and compete.

      dare to dream.
       
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    8. JMN
      Curious

      JMN Christian Member Full Member

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      [​IMG] Questionmark
       
    9. JKraver
      Tired

      JKraver Well-Known Member Full Member

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      The plan is to go model less, we do have a form2 and I would possibly print a solid if we had issues. I don't have intention of scanning just to make a model and go traditional.
       
    10. CAD_Lady
      Artistic

      CAD_Lady New Member

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      Going directly to a scan rather than pouring then going to a scan is obviously much more accurate.
      Option A: Scanning impression on Medit is <7 micron variable.
      Or option B pouring stone adding a 40-70 micron variable, then scanning adding another 7 micron variable?

      Cut the impression the same way you would for a traditional pour
      Do not spray.
      Turn on texture scanning
      Use 3 axis arm
      Go to options
      Turn on Detail scan
      Select no for optimize and refine setting
      Strategically insert the impression into the arm to optimize camera view points
       
    11. JMN
      Curious

      JMN Christian Member Full Member

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      Greetings Earthling! Welcome!

      What percentage of impresions do you find unable to be scanned?

      Have you been able to get your eye trained to where you know which one's won't and send them to modelwork without loosing time trying to scan?
       
    12. PDC

      PDC Active Member Full Member

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      I've compared the marginal fits between Itero dies and those from actual impressions and found them to be very accurate. I've also found the accuracy of fits on printed models does seem to vary with the type of printer used.

      We have to deal with variables at every turn. From the IO scans to the way the models are fabricated. You've just got to find the sweet spot for whatever comes at you.
       
    13. Joshua R. Baldwin
      Amazed

      Joshua R. Baldwin New Member Full Member

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      I have a medit t-500 scanner and have great success scanning the triple tray impressions I receive from my doctors. Cutting the excess material away makes a huge difference in the amount of scan data captured. It's also important to build a good relationship with the doctor to share feedback and ensure your getting the best impressions possible.
       
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    14. paulg100

      paulg100 Well-Known Member Full Member

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      what printer are you using for the models Joshua or are you doing model less crowns from the scans? thanks
       
    15. Joshua R. Baldwin
      Amazed

      Joshua R. Baldwin New Member Full Member

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      Model-less, sir. Many of my doctors find them uneccesary and we have enjoyed great success without them.
       
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    16. CAD_Lady
      Artistic

      CAD_Lady New Member

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      Hi there.
      Thank you!
      So I started with pouring a die, trimming it, then scanning it in with the impression. Only temporary to dial in the contact and occlusion settings. Its easier to focus on dialing in one area at a time. Once your numbers are dialed in quit pouring dies and start watching the margins. Shoulders/chamfers are so much easier if Dr practices good retraction techniques.

      Don't forget to use Tru smile if you have it, it helps alot. Also wireframe will show you surface changes that may be helpful.
      Honestly if you scan it and cant see the margins, just pour a die and add it to your cad scene. Don't stress over making the entire model.
       
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    17. JMN
      Curious

      JMN Christian Member Full Member

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      Thank you. Good procedure development.
       
    18. paulg100

      paulg100 Well-Known Member Full Member

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      Cad-Lady what is so helpful about Tru-smile its one of the few add ons I didn't get as it seemed a bit pointless?
       
    19. 2thm8kr
      Devilish

      2thm8kr Beanosavedmysociallife Full Member

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      @paulg100 it isn't something you might use every day, but if you do digital dx work up to present to the patient it is nice to be able to help them visualize the
      shade of their proposed restoration rather than the yellow color of the anatomic crowns in free form. I have had patients ask me if their teeth will be yellow
      when they are done more than once. ¯\_(ツ)_/¯
       
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    20. tomas
      Spaced

      tomas Member Sponsors Full Member

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      could you share some of your scan picture to us , we have big problem with the scan file , margin is not clear , over bite and mesh on the margin area ,

      Thank you
       

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