Mark Jackson
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We have really refined the YZ post milling processes (with the help of Glidewell R&D). Thought I'd share:
1) Put disc in large ultrasonic for one minute after milling and brushing and blowing off dust. You'll be surprised how quickly the water looks like milk. Tons of residual dust and debris you thought came off is still there. Change water.
2) Cut out units, refine anatomy if desired, brush/blow and put in smaller ultrasonic for additional four minutes. Again, water will fill instantly with plumes of white debris and turn solid white. Change water after every cycle.
3) Microwave on low for four minutes
4) Dry under UV light & suction for one minute
5) Pigment under full vacuum for five minutes
6) Dry under UV and suction for ten minutes
7) Sinter
We are doing this for BruxZir as well as copings and frameworks. You'd be surprised how much junk is left on the zirconia after milling and cleaning the old way, and under SEM examination it almost looks like sandpaper, but the little bits and pieces aren't sintered solidly into place, which could be affecting bond strength of layered porcelain, and certainly affects smoothness of glaze, wear and fit to the die. Studies are being done, but even to the naked eye, or under normal lab magnification the difference is dramatic.
Seems like a lot of extra work, but it makes a huge difference in quality. This is what the latest evolution of the prep center looks like. I've shared pictures in the past as this have changed..
1) Put disc in large ultrasonic for one minute after milling and brushing and blowing off dust. You'll be surprised how quickly the water looks like milk. Tons of residual dust and debris you thought came off is still there. Change water.
2) Cut out units, refine anatomy if desired, brush/blow and put in smaller ultrasonic for additional four minutes. Again, water will fill instantly with plumes of white debris and turn solid white. Change water after every cycle.
3) Microwave on low for four minutes
4) Dry under UV light & suction for one minute
5) Pigment under full vacuum for five minutes
6) Dry under UV and suction for ten minutes
7) Sinter
We are doing this for BruxZir as well as copings and frameworks. You'd be surprised how much junk is left on the zirconia after milling and cleaning the old way, and under SEM examination it almost looks like sandpaper, but the little bits and pieces aren't sintered solidly into place, which could be affecting bond strength of layered porcelain, and certainly affects smoothness of glaze, wear and fit to the die. Studies are being done, but even to the naked eye, or under normal lab magnification the difference is dramatic.
Seems like a lot of extra work, but it makes a huge difference in quality. This is what the latest evolution of the prep center looks like. I've shared pictures in the past as this have changed..
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