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.
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