Violation
In periodontal therapy, 'guided tissue regeneration' is most successful in treating 1. horizontal bone loss. 2. a 3-walled infrabony defect. 3. a mandibular Class III furcation involvement. 4. a mandibular Class II furcation involvement.
(2) and (4)
(1) (2) (3)
(1) and (3)
(4) only.
All of the above.