Contraindication for an all ceramic crown

# Each of the following patient situations is

considered a contraindication for an all-

ceramic crown EXCEPT one. Which one is

the EXCEPTION?

A. Extensive wear of tooth structure or restorations

B. Previous history of ceramic crown fractures

C. Amalgam restorations with marginal breakdown

D. Severe bruxism

The correct answer is C. Amalgam restorations with marginal breakdown. 

A history of ceramic crown fractures and extensive wear of opposing tooth structure

or restorations suggests to the clinician

that a heavy occlusal load is present during

occlusion.

People who chew hard foods and brux

severely will place the all-ceramic crown

under strong occlusal forces that may

cause it to fracture or overly wear the

opposing teeth.

Extensive and faulty amalgam restorations

that are displayed or are not placed

esthetically can be better replaced with an

all-ceramic crown.

Amalgam restorations with marginal

leakage and/ or breakdown can be

replaced in the core build-up for the PFM crown.

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