Answer is e. 1, 2 & 5 are correct.
Previous classification (1989) did not include a section on gingival diseases. In this classification, gingival diseases are classified into either dental plaque induced or non-plaque induced. Non-plaque induced includes a wide range of disorder that effect the gingiva.
3 is false: Periodontic-Endodontic lesions are an additional category in the new classification system.
4 is false: Characteristics common to all gingival diseases include reversibility of the disease by removing the etiology and precursor to attachment loss around teeth.
REF: Armitage, G.: Development of a Classification System for Periodontal diseases and Conditions. Ann Periodontal 4: 1-6, 1999
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