Dental The most common mechanical failure for metal-ceramic restorations is A Debonding of the porcelain from the metal. B Shrinkage of the porcelain at mouth temperature. C Debonding of the PFM from the tooth. D None of the above 💡 Explanation The most common mechanical failure for metal-ceramic restorations is ✓ Correct Answer: A. Debonding of the porcelain from the metal.