Table 1 Modified USPHS criteria

Marginal adaptation

A

Probe, does not catch, smooth margin interface

B

Probe catches at single spots, slight roughness

C

Probe catches under 50% of margin length

D

Probe catches at/over 50% of margin length

Marginal discoloration

A

No discoloration on the margin

B

Superficial discoloration on the margin, no penetrate in pulp direction

C

Discoloration has penetrated the margin in pulp direction

Integrity of restoration

A

Completely intact

B

Crack apparent on transillumination

C

Fracture observable

D

Crown lost(state at which interface debond occurred)