yeah, that is typical for non-biologic dentists.  it's too bad they don't pull the periodontal ligament, as it creates a cavitation nearly 100% of the time in wisdome teeth.  the antibiotics are not necessary unless there was a prior abcess/infection.  in fact, they hamper healing.  be sure to have the cavitations done at some point.  you wil need to consult a biologic dentist to have it done, as regular dentists do not know about them.

Torrie