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.
(1) (2) (3)
(1) and (3)
(2) and (4)
(4) only
All of the above
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