Violation
The retention form of a full crown preparation can be improved by 1. reducing its taper. 2. increasing its length. 3. utilizing grooves or boxes. 4. polishing the preparation.
(2) and (4)
(1) (2) (3)
(1) and (3)
All of the above
(4) only
The retention form of a full crown preparation can be improved by 1. reducing its taper. 2. increasing its length. 3. utilizing grooves or boxes. 4. polishing the preparation.
(2) and (4)
(1) (2) (3)
(1) and (3)
All of the above
(4) only