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    Help with Porcelain Bubbling Problems?
    Jeff Walker · Owner at London Bridge Dental Lab

    It's most likely from contamination somewhere in the process of conditioning and opaquing, as I'm sure you realize. Here's what I do to avoid the same thing:

    First, I use specific finishing/grinding tools for each metal and I don't cross contaminate. When using stones, I only use aluminum oxide.

    Second,...

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