S
Scotties dental studio
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Good day fellow teckies.
Firstly please excuse my poor photographs.
I have been 3D printing the same RPD design using Resione C01 castable resin
Fitting the printed patterns onto 3D printed model ( using elegoo 8K space grey standard resin)
Both printed on Saturn 4 Ultra printer.
The resin patterns fit well on the model, but once cast are nowhere near fitting.
( I use Interfine C&B speed investment, 70% expansion liquid /30% distilled water Liquid to powder ratio as per manufacturer, 9X ring, 3 ring liners, invested ring straight into 900 deg celcius 15-20 mins after first contact with investment, all manufacturers instructions followed.)
So, foolishly I, assumed that expansion ratio needs adjusting, I cast 4 other frameworks with the same pattern, 5% difference in expansion liq/ water both more and less either side of the recommended 70/30% ratio.
None of the frames are close to fitting, I deactivated all the clasps to see if I could at least get the major connector to seat on the palate area, no luck with that either.
The discrepancy is in the clasp/rest area on both sides of the arch it seems, one can see the frame design on the pic below.
The pattern was sprued in these areas, so my thought was that solidification shrinkage of the alloy may have distorted the fit in these areas.
I have been reading a few articles about the placement of a stabilizer bar in the 3D printed pattern to minimize the distortion, can anybody give me feedback as to whether this may sort my fit issue, or any other ideas why my frames don't want to fit, would be welcomed ??
TIA
Firstly please excuse my poor photographs.
I have been 3D printing the same RPD design using Resione C01 castable resin
Fitting the printed patterns onto 3D printed model ( using elegoo 8K space grey standard resin)
Both printed on Saturn 4 Ultra printer.
The resin patterns fit well on the model, but once cast are nowhere near fitting.
( I use Interfine C&B speed investment, 70% expansion liquid /30% distilled water Liquid to powder ratio as per manufacturer, 9X ring, 3 ring liners, invested ring straight into 900 deg celcius 15-20 mins after first contact with investment, all manufacturers instructions followed.)
So, foolishly I, assumed that expansion ratio needs adjusting, I cast 4 other frameworks with the same pattern, 5% difference in expansion liq/ water both more and less either side of the recommended 70/30% ratio.
None of the frames are close to fitting, I deactivated all the clasps to see if I could at least get the major connector to seat on the palate area, no luck with that either.
The discrepancy is in the clasp/rest area on both sides of the arch it seems, one can see the frame design on the pic below.
The pattern was sprued in these areas, so my thought was that solidification shrinkage of the alloy may have distorted the fit in these areas.
I have been reading a few articles about the placement of a stabilizer bar in the 3D printed pattern to minimize the distortion, can anybody give me feedback as to whether this may sort my fit issue, or any other ideas why my frames don't want to fit, would be welcomed ??
TIA
