Is it possible to make exact copies of plaster dental models?

Discussion in 'Dental Archive' started by Fred, May 31, 2008.

  1. Fred

    Fred Guest

    Is it possible to make exact copies of plaster dental models?

    Fred, May 31, 2008
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  2. Fred

    Fred Guest

    That's ok. Howa re they copied?

    Fred, May 31, 2008
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  3. Fred wrote:

    The traditional way would be to make an impression of the model (just
    as an impression of the natural teeth would be) and pour it up in dental
    Now CAD-CAM technology is coming into dentistry--models can be copied,
    manipulated, etc. with optical scans and milling, as is done in
    Invisalign orthodontic technology.

    Mark & Steven Bornfeld, May 31, 2008
  4. Fred

    Newbie Guest

    On Fri, 30 May 2008 21:33:19 -0400, Steven Bornfeld

    Plaster is never used in my practice. Die stone only.
    Newbie, May 31, 2008
  5. Fred

    Newbie Guest

    Very carefully.
    Newbie, May 31, 2008
  6. Fred

    Newbie Guest

    On Sat, 31 May 2008 15:00:29 GMT, Mark & Steven Bornfeld
    Not just any impression, think cast duplication for refractory cast
    construction for RPD frames. Reversible hydrocolloid in a flask.
    While not perfect, it's pretty damn good.

    Again, die stone.
    And very expensive machinery is required.

    Why duplicate casts anyway ?

    Just make new ones.
    Newbie, May 31, 2008
  7. Fred

    Newbie Guest

    On Sat, 31 May 2008 18:27:18 -0400, Steven Bornfeld

    With some rubber base I would hope. <hehe>

    Yeah, know that technic too, when was the last time
    you used it ? For me since school, not once, but it
    is a viable technic.
    Newbie, Jun 1, 2008
  8. Fred

    Fred Guest

    I've got plaster models from 1996 and want a copy of current models to see
    how much my mouth has changed.
    Didn't realize dental modeling had gone high tech. The models my dentist
    has for me appar to be plaster. I'll ask.

    Fred, Jun 1, 2008
  9. Fred

    Newbie Guest

    Just get your dentist to make you a new set for yourself.
    Easier and more accurate than dupes.
    Be prepared to pay a nominal fee.
    Newbie, Jun 1, 2008
  10. -- > Why duplicate casts anyway ?

    Probably a lawyer
    Amatus Cremona, Jun 2, 2008
  11. I did a few copper bands with compound and relined with Permalastic back in
    the 1980's. Optical impressions this century.



    Amatus Cremona, Jun 2, 2008
  12. It was nice on deep bleeding margins before the diode laser, and if you
    could not use the electrosurgery for some reason. Compound does not care if
    the prep is wet. You can get a lot of fine detail in compound if try hard.



    Amatus Cremona, Jun 3, 2008
  13. Fred

    Newbie Guest

    Man you really are old school !!!

    We took the 'copper tops' and just sealed the top with
    green stick compound after festooning.

    Filled it with rubber base mixed with a drop or two of water
    to speed setting, and seated "quickly and firmly". <hehe>
    We only used for margin detail capture if you missed in your
    full arch.

    Now for constructing a pedo fixed space mainterer, you haven't
    lived until you took a full arch impression with hot green plate and
    stick compound. What fun for the kiddos ! NOT !

    And then there was the grey compound, nice for border molding
    if you tempered it. Red was the tough one !!! Blisters anyone ?

    Thanks to all the workers who have helped to develop
    our modern dental materials. Hip Hip Hurray for them all !

    On Mon, 02 Jun 2008 22:56:41 -0400, Steven Bornfeld
    Newbie, Jun 6, 2008
  14. Fred

    Newbie Guest

    On Tue, 3 Jun 2008 07:31:17 -0400, "Amatus Cremona"

    We didn't have no stinkin' laZers in my school.
    And damned few instructors that ever practiced in the
    *real world*. They would send the patient to a frakkin'
    periodontist for gingivitis !!!

    I still practice without either electrosurg or laser.

    If you wish me to expound on practical, expedient, and cost
    effective hemostasis for C&B just say the word.
    BTW 'crown lengthening' ain't no big deal and
    there is no 'need to feed' a perioD.

    Compound can be useful in some rare situations,
    and yes there is some in my office. Sorry can't remember
    the last time it was used, there are better materials available
    for prosthetics.
    Newbie, Jun 7, 2008
  15. Fred

    Newbie Guest

    On Tue, 03 Jun 2008 08:52:37 -0400, Steven Bornfeld

    Dang, didn't know that you went to dental school before 1923.

    Was in DS before the major advent of poly-ether, it was cutting
    edge and too expensive to waste on students at the time.

    PolySulfide was king, full arch, custom tray only.
    Condensation v. Addition Silicone was the debate of the day.

    Final impressions for CDs was in a baseplate/custom tray with ZOE.
    Loved the stuff personally, patients hated it as well as lab techs.

    Some of the old bastards really clung to the ancient ways.
    Oh wait, sometimes I'm an 'old bastard' , <hehe>

    Just what is the name of that purple shit that I only used when
    the employing dentist was buying the material ?
    I don't remember, won't never buy it again.

    And while I am on my soapbox, screw reversible hydrocolliod too !!!

    It may have been the best at the time but sucks now by comparison....
    Anyone ever take a plaster impression for a denture with a
    break-away tray ?

    Dang we got it good these days.
    Newbie, Jun 7, 2008
  16. Fred

    Steven Fawks Guest

    Couldn't agree more!

    I used reversible hydrocolloid out of school, and that 4 minutes
    with water cooling the tray was unpleasant. It was so nice to
    be able to ditch the stuff.

    Steven Fawks, Jun 7, 2008
  17. wrote:
    This sounds like child abuse.

    There are still people who swear by reversible hydrocolloid. I only
    saw it used once, in a water-cooled tray. Maybe it wasn't tempered
    right, but I saw the poor patient's face go beet-red, and her eyes
    almost pop out of my head. I found myself getting very angry at the
    nonchalance of the instructors and students gathered around. She was
    clearly in a lot of pain.
    Mark & Steven Bornfeld, Jun 7, 2008
  18. wrote:


    Steve (from the Days of the Giants)
    Mark & Steven Bornfeld, Jun 7, 2008
  19. Fred

    Newbie Guest

    On Sat, 07 Jun 2008 17:20:12 GMT, Mark & Steven Bornfeld

    Newbie, Jun 8, 2008
  20. Fred

    Newbie Guest

    On Sat, 07 Jun 2008 17:02:20 GMT, Mark & Steven Bornfeld

    Kudos to the materials scientists !
    Newbie, Jun 8, 2008
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