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Medical Forum / General / Dentistry / March 2007Why two impressions for a denture
Hi Had an impression for a denture last week and again another today. My dentist also the wax fitting and made adjustments to that. Only just dawned on me to ask why a second impression 1st impression is used to make a model on which a custom fitted impression tray is made. This increases the accuracy and decreases the distortion. Also allows for border moulding. Purpose is to get a better fit.  SignatureRoy rem NADA to reply | Hi | | Had an impression for a denture last week and again another today. My | dentist also the wax fitting and made adjustments to that. | | Only just dawned on me to ask why a second impression Of course You can use for exemple compound technic using plasto....(sorry) You can make it in one shot. Material is very good .You are spare time for you and patients and reduce expencess If you need more info send hsm.a.polanowska@neostrada.pl > Hi > > Had an impression for a denture last week and again another today. My > dentist also the wax fitting and made adjustments to that. > > Only just dawned on me to ask why a second impression >Hi > >Had an impression for a denture last week and again another today. My >dentist also the wax fitting and made adjustments to that. > >Only just dawned on me to ask why a second impression Excellent dentist .. .that is how it should be done with a preliminary impression, the fabrication of a custom tray ... and then a final impression! Joel M. Eichen DDS Thats right but in fact there is couple methods when we could spare time :)) regards >>Hi >> [quoted text clipped - 8 lines] > > Joel M. Eichen DDS > That's right but in fact there is couple methods when we could spare time > :)) Another nice way is to border mold the old dentures and take a "wash" impression. Send it to the lab and have the lab pour models, duplicate the set-up with new teeth, and reline the old dentures prior to returning it. You get to do a wax try-in of new dentures which approximate what the patient is used to, and give the patient relined previous dentures which becomes better spare dentures. Adjust the wax-try as needed to compensate for tooth wear and improved esthetics/phonetics, and send back to the lab for processing. Signature/ Amatus / > Thats right but in fact there is couple methods when we could spare time > :)) [quoted text clipped - 13 lines] >> >> Joel M. Eichen DDS yes but using plastogum .You are making impression tray and functional impression in "one shot" so Its more simpler. using acudent You can make it also but this system is more expensive. regards hah anyway if you have wax try-in or new denture you can make dublication in dental office using alginate and Lang dubli flasks regards >> That's right but in fact there is couple methods when we could spare time >> :)) [quoted text clipped - 25 lines] >>> >>> Joel M. Eichen DDS Is Plastogum, the material from Bosworth? If so please explain the technique. The Accudent is not really that expensive, when one considers the cost of final impression materials and custom trays. SignatureRoy rem NADA to reply | yes but | using plastogum .You are making impression tray and functional impression in [quoted text clipped - 37 lines] | >>> | >>> Joel M. Eichen DDS this technic 1conventionaly tray- large enough to allow for planty of material buccaly and labialy.extension deep enough in posterior region to properly cover tuberosity 2 ordinarycompound snap impression is taken 3 after the tray has been removed from the mounth and chilled, cut away 1-2mm of compund from center of hard palate to ridge, over entire labial wall to periphery.Trim periphery clear of muscle interference 4 mix plastogam and apply on tray over entire surface 4 place tray into mounth 5 1 minutes for functional impression regards > Is Plastogum, the material from Bosworth? If so please explain the > technique. [quoted text clipped - 61 lines] > | >>> > | >>> Joel M. Eichen DDS Sounds good if the original dentures are suitable for working with. Many are not. Most times that I recommend replacing dentures is because the originals violate the basic principles of prosthetic dentistry. If the original was suitable I'd suggest using tissue conditioner for a functional impression which would also prep for a better final. SignatureRoy rem NADA to reply | > That's right but in fact there is couple methods when we could spare time | > :)) [quoted text clipped - 7 lines] | for tooth wear and improved esthetics/phonetics, and send back to the lab | for processing. >> That's right but in fact there is couple methods when we could spare time >> :)) > >Another nice way is to border mold the old dentures and take a "wash" >impression. Send it to the lab and have the lab pour models, duplicate the >set-up with new teeth, and reline the old dentures prior to returning it. Yeah but the denture wearer won't go home without his teeth and frequently camp out in the oiffice ..... Joel >You get to do a wax try-in of new dentures which approximate what the >patient is used to, and give the patient relined previous dentures which >becomes better spare dentures. Adjust the wax-try as needed to compensate >for tooth wear and improved esthetics/phonetics, and send back to the lab >for processing. > Yeah but the denture wearer won't go home without his teeth and > frequently camp out in the office ..... Many labs will do this service in one day. (Not the wax try-in). If you make the impressions in the dentures early in the morning, the lab will pick it up, make their models, reline the dentures and return the case that afternoon. A week later, the wax-try is ready to do. The patient only has to hide from the public for 5-7 hours. Signature/ Amatus / > >>> That's right but in fact there is couple methods when we could spare [quoted text clipped - 16 lines] >>for tooth wear and improved esthetics/phonetics, and send back to the lab >>for processing. >Hi > >Had an impression for a denture last week and again another today. My >dentist also the wax fitting and made adjustments to that. > >Only just dawned on me to ask why a second impression Initial and final impressions, makes for a better fit. -- W_B Take out the G'RBAGE wubbabubbazG@RBAGEyahoo.com Some of the tissues are tightly bound to bone and some are loose and elastic. The first impression captures the tightly bound tissues and allows the fabrication of a custom tray. From the custom tray a second impression is made that captures the more movable tissues at the peripheries of the dentures and also a final wash of the tightly bound tissues. Some dentists do it all in one one impression but I prefer the two impression technique. > Hi Me too, except for the nightmare cases where there is floppy tissue on the ridges and the patient won't go to a surgeon to make things better. Custom trays and vinyl will squeeze and displace the tissue. The denture will do the same. Bad combo. D > Some of the tissues are tightly bound to bone and some are loose and > elastic. The first impression captures the tightly bound tissues and [quoted text clipped - 5 lines] > >>Hi So then what do you do on the flaccid ridge cases ? Quit using two impr technic for F/ many years ago. Using Jeltrate plus in an edentulous tray, but am the only guy that my prosth lab will accept an alginate from. Only time using a custom tray is when the arch is too large to be accomodated by a stock tray. This goes for partials too. >Me too, except for the nightmare cases where there is floppy >tissue on the ridges and the patient won't go to a surgeon to [quoted text clipped - 14 lines] >> >>>Hi Soft mix of alginate in an appropriate edentulous tray. I got a whole set of them on a public TV auction years ago for less than $100. Steve > So then what do you do on the flaccid ridge cases ? > [quoted text clipped - 4 lines] > Only time using a custom tray is when the arch is too large > to be accomodated by a stock tray. This goes for partials too. >>Me too, except for the nightmare cases where there is floppy >>tissue on the ridges and the patient won't go to a surgeon to >>make things better. |
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