Which of the following statements are true regarding access preparation?
1. The objective of entry is to give direct access to the pulp chamber, not merely the canal orifices.
2. Access cavity preparations are similar to operative occlusal preparations
3. The likely interior anatomy of a tooth under treatment need not be determined before entry since unroofing will reveal canal orifice locations.
4. The rubber dam should always be placed before initial access preparation.
All of the above
None of the above
1 and 4
1 and 3
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