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  1. drm313mac

    Pitting of Teeth When Shell-Blasting

    I have never tried that. We will soak in something + ultrasonic, especially the higher-end dentures. AND I discovered today the tech who invested this case forgot to coat the teeth prior to investing.
  2. drm313mac

    Pitting of Teeth When Shell-Blasting

    Tom, With that in mind, I did an experiment. I took a denture made with the lower cost Yamahachi teeth, as well as another with Unidesa Ortolux Top teeth, and blasted for 5 seconds @ 90 degrees from ~ 1 cm, and no damage whatsoever. This same test destroyed the Mondial-i teeth. To answer...
  3. drm313mac

    Pitting of Teeth When Shell-Blasting

    4-bar is just over 58 psi, so that should not be the issue, as we are running 60 psi. No, the only thing I have ever used is walnut shells. I will look into this. Has anyone ever had bad batches of teeth? Too soft? I am awaiting a reply from my Heraeus Kulzer rep, Chris Ove, on this issue...
  4. drm313mac

    Pitting of Teeth When Shell-Blasting

    An issue we are having here, and am wondering if we are alone in this: When removing stone after processing, using the Trinco @ 60 psi (natural walnut shells),Heraeus Kulzer Mondial-i teeth are losing their outer layer. of course, we are trying not to directly hit the teeth, but sometimes...
  5. drm313mac

    Help Removable Lab Fees?

    Guys (and gals),I see a major fallacy here. The prices quoted are for the base denture, with very basic (cheap) teeth, and the lab's real profit is in the upsell of the teeth. We charge ~$250 for our middle-of-the-road denture. When the referring office wants better than say Yamahachi teeth...
  6. drm313mac

    Whats the best way to polish Duraflex Dentures?

    You might do Myerson's webinar on polishing these. Presented by Chris Shimmerhorn, what he states has made the difference for us. We polish pretty much as presented, then flame the material. That is, we apply heat but without allowing the flame to touch the material, and our partials are now...
  7. drm313mac

    Flexite Acetal or Myerson Duracetal

    Is not this a polyamide, meaning a nylon, and thus VERY hydrophilic? HOW can this be better? Let it dry and you have to toss it?
  8. drm313mac

    Thermoplastic Acrylics

    You are of course totally correct. I was asking questions for the purpose of learning, and this is a waste of my time and yours. You do not know the answers, nor do you care to discover them. I had hoped to learn from you, the techs, but instead I should spend my time asking those who...
  9. drm313mac

    Thermoplastic Acrylics

    You mean, after processing, heat up the finished denture to a temperature > 66 Celsius, to drive off the excess monomer? IF this would not do damage to the denture and there is no reason to believe it would (scalding coffee is well over that temp),this might do the trick. What about residual...
  10. drm313mac

    Thermoplastic Acrylics

    I did not purchase the Flexite machine as I did not want to be stuck with only Flaxite. The tcs seems more versatile. So the Astron is nylon, along with others. What are the working conditions of the vinyls? Who even sells vinyl? I will assume this is flexible partial only? Are there any...
  11. drm313mac

    Thermoplastic Acrylics

    "Low cost high end ... just doesn't exist." In your lab, I agree. Perhaps where you are in California, this is totally true. Perhaps even in mosty of the country, you are correct. By having excellent impressions, accurate models, WHY does an economy denture have to cost a lot? Basic...
  12. drm313mac

    Thermoplastic Acrylics

    Type-IV stone: Patients understand one thing above all others, that being FIT. Type-II stone has a setting expansion 10 times higher, and this is one of the reasons dentures do no fit. All steps are additive, all errors cumulative. Given the minimal difference in costs between the 2 stone...
  13. drm313mac

    Thermoplastic Acrylics

    Another question I have regarding the higher pressure injection systems. Do we need to protect the teeth, different from normal flasking, from this injection pressure? Are any of you having issues herein?
  14. drm313mac

    Thermoplastic Acrylics

    What is the issue with stone? Is it that the stone must withstand the temperatures and pressure? Will not Type-IV stone work? What seperator must be used with each? Can one agent be used for all thermoplastic systems? What brands do you advocate? With my lack of experience, I have always...
  15. drm313mac

    Thermoplastic Acrylics

    Andrew, What is the max pressure your compressor runs at? That is, I thought you previously told me you have a commercial unit? Mine maxxes out @ 175 psi, 34.1 cfm, 120 gallon tank. I assume this would be sufficiant then to inject these materials? The point then, would it not be prudent...
  16. drm313mac

    Thermoplastic Acrylics

    Heating prior to injection: Yes, I agree with what you are saying, but I am only advocating heating to 60 Celsius, so will this also have the same effect? Will I lose the material by heating only to that lower temerature? Also, if I am heating prior to injection, but otherwise following...
  17. drm313mac

    Thermoplastic Acrylics

    Ohio allows any, under direct and indirect supervision, to do impressions as long as I do the final, try-in as long as I am present, delivery as long as I am present. The law states what positions can do what procedures. As for the temperature gauge, is there any you recommend?
  18. drm313mac

    Thermoplastic Acrylics

    True costs are the total of materials plus labor, with miscellaneous. It makes no difference if the denture is low- or high-end. Realistically the costs are the impression material, acrylic used, teeth, and labor, and all else is less by comparison. This is accounted for in my production...
  19. drm313mac

    Thermoplastic Acrylics

    The $300 denture: Is quality possible @ this price? The office manager will try to upsell to a better denture, say @ $525, one where we actually show a profit. If she succeeds, fine, and if $300 is all that customer can afford, okay as well. Why? (1) we are providing a needed service, and...
  20. drm313mac

    Thermoplastic Acrylics

    John, Learning is a two-way street. Yes, I am learning from you, and yes, I am taking what you say and working it into new things as well. This is the process by which improvements are reached. Yes, I always read manufacturer's instructions, and I often try other things. My background...
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