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.

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