What are the objectives of furcation therapy:
Facilitate maintenance.
Prevent further attachment loss.
Obliterate the furcation defects as a periodontal maintenance problem.
All of the above.
The objectives of furcation therapy are to

Facilitate maintenance
Prevent further attachment loss and
Obliterate the furcation defects as a periodontal maintenance problem. The selection of therapeutic mode varies with the class of furcation involvement, the extent and configuration of bone loss, and other anatomic factors.