Violation

The crown-root ratio is 1. the comparison of the length of root retained in bone to the amount of tooth external to it. 2. an important factor in abutment tooth selection. 3. determined from radiographs. 4. determined during surveying of the diagnostic cast.

(1) (2) (3)

(1) and (3)

(2) and (4)

(4) only

All of the above

Please describe the matter of abuse