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Mercury456
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Hello DLN, first time posting! We have been having trouble with an 8 unit bridge.
The first time we tried sintering it on beads,without a support bar, and the bridge was rocking on the model. This was done with our standard sintering program, heating 10 degrees(Celsius)/min up to 1550. Hold at 1550 for 2 hours. Cooling is 5 degrees/min to 0.
The second time we tried with a Sum3D kickstand sintering bar, we stood it up in the oven on beads. However this was done in an older Zyrocomat we use for single units, 7-8 hour cycle, don't know the ramp or cool numbers. The bridge fractured around the sprues when despruing.
The third time we tried with the same Sum3D bar but with a much slower sintering program (again standing on beads). Our sintering program was: heating 5 degrees(Celsius)/min up to 1550. Hold at 1550 for 2 hours. Cooling is 2 degrees/min to 0. Still fractured around the preps and sprues in two places.
The fourth time...Done without a sintering bar again with standard sintering program, it rocked on the model.
We use Talladium High Strength Luminesse Zirconia. Roland DWX-50 mill (bridge was done with a "high quality" strategy, don't know specifics). This bridge was designed on Exocad. We use Sum3D for CAM. Using a Zircomat 6000 MS. Vita YZ 380 sintering beads. We dip the Zirconia in ZirkonZahn water-based color liquid for 45 seconds and dry under a heat lamp for 1 hour.
I am a newbie in the dental lab field and CAD/CAM, the lab has had success with these types of bridges using a 7-8 hour cycle in the past, using a process very similar to what I described, so thoughts about common newbie mistakes/execution would be great!
picture of CAM setup.
bridge #3 on model
bridge #4 on model
The first time we tried sintering it on beads,without a support bar, and the bridge was rocking on the model. This was done with our standard sintering program, heating 10 degrees(Celsius)/min up to 1550. Hold at 1550 for 2 hours. Cooling is 5 degrees/min to 0.
The second time we tried with a Sum3D kickstand sintering bar, we stood it up in the oven on beads. However this was done in an older Zyrocomat we use for single units, 7-8 hour cycle, don't know the ramp or cool numbers. The bridge fractured around the sprues when despruing.
The third time we tried with the same Sum3D bar but with a much slower sintering program (again standing on beads). Our sintering program was: heating 5 degrees(Celsius)/min up to 1550. Hold at 1550 for 2 hours. Cooling is 2 degrees/min to 0. Still fractured around the preps and sprues in two places.
The fourth time...Done without a sintering bar again with standard sintering program, it rocked on the model.
We use Talladium High Strength Luminesse Zirconia. Roland DWX-50 mill (bridge was done with a "high quality" strategy, don't know specifics). This bridge was designed on Exocad. We use Sum3D for CAM. Using a Zircomat 6000 MS. Vita YZ 380 sintering beads. We dip the Zirconia in ZirkonZahn water-based color liquid for 45 seconds and dry under a heat lamp for 1 hour.
I am a newbie in the dental lab field and CAD/CAM, the lab has had success with these types of bridges using a 7-8 hour cycle in the past, using a process very similar to what I described, so thoughts about common newbie mistakes/execution would be great!
picture of CAM setup.
bridge #3 on model
bridge #4 on model