If a tooth has an inadequate ferrule, which of the following is/are effective strategies to increase tooth structure available for crown preparation?
1. Surgical crown lengthening.
2. Sub-gingival preparation and prolonged temporization.
3. Orthodontic eruption.
4. Elective endodontic treatment gaining retention from a post in the root.
(1) and (3)
All of the above.
(1) (2) (3)
(4) only
(2) and (4)
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