D. Sign Porcelain

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d.SIGN likes the CTE of the alloy to be between 14.0 up to 14.8 It is most happy with using alloys say from 14.1 - 14.7. Once you reach the high 14's and low 15's you run the risk of coefficiency stresses.

but d.sign doesn't like aurriloy which has 14,4.with forall metal from ivoclar which has 13,8 there is no problem.