Violation

The desirable relationship between the coefficients of thermal expansion of an alloy (ε metal ) and a ceramic (εceramic) used for a metallo-ceramic restoration is

ε metal significantly lower than εceramic

ε metal slightly higher than εceramic.

ε metal significantly higher than εceramic.

ε metal slightly lower than εceramic

ε metal equal to εceramic

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