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)