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.
(2) and (4)
(1) (2) (3)
(1) and (3)
All of the above
(4) only
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.
(2) and (4)
(1) (2) (3)
(1) and (3)
All of the above
(4) only