Violation
A crown margin can be extended subgingivally when required 1. for esthetics. 2. to increase retention. 3. to reach sound tooth structure. 4. for caries prevention.
(1) (2) (3)
(1) and (3)
(2) and (4)
(4) only
All of the above.
A crown margin can be extended subgingivally when required 1. for esthetics. 2. to increase retention. 3. to reach sound tooth structure. 4. for caries prevention.
(1) (2) (3)
(1) and (3)
(2) and (4)
(4) only
All of the above.