Particulate hydroxyapatite, when placed subperiostially,
1. is highly biocompatible.
2. has a low incidence of secondary infection following surgery.
3. has a tendency to migrate following insertion.
4. induces bone formation throughout the implanted material.

All of the above.

(1) (2) (3)

(1) and (3)

(2) and (4)

(4) only