Which of the following is/are part of optimal post preparation procedure? 1. Use of non-end cutting rotary instruments. 2. Minimal canal enlargement. 3. Passive post fit. 4. Diameter of the post that is half the width of the root
(1) (2) (3)
(4) only
(2) and (4)
(1) and (3)
All of the above.
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