Advice to Prevent Zirconia Bridge Warpage?

Anyone have any advice on zirconia bridge frameworks "warping"? Hardly ever happens with frameworks with no curve, but seems to be more frequent with 4 unit and larger frames that curve (anterior). Individual units fit terrific internally and marginally, but 2-3 out of 10 times the frames will rock slightly. We are sintering these alone with no rapid sintering cycles.

December 3, 2013

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