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Which of the following will improve the prognosis of a rebonded fractured tooth fragment? 1. Total etching and dentin bonding. 2. Use of a groove in the fragment. 3. Having a single larger fragment to rebond. 4. Reinforcing the fracture line with composite.

All of the above.

(4) only

(2) and (4)

(1) and (3)

(1) (2) (3)

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