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New English File Intermediate Supplementary Resources

Chia sẻ: Thao Thao | Ngày: | Loại File: PDF | Số trang:42

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New English File Intermediate Supplementary Resources

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Gingivitis and periodontitis are the two main periodontal diseases and may be present concurrently. Gingivitis is a form of periodontal disease in which gingival tissues are inflamed but their destruction is mild and reversible while periodontitis is a chronic inflammatory response to the subgingival bacteria with irreversible changes (Armitage, 1999). Periodontium destruction is characterized by loss of connective tissue attachment and bone around the teeth in conjunction with the formation of periodontal pockets due to apical migration of the junctional epithelium (Champagne et al., 2003)....

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