Long-term Case Reports Demonstrating Use of Porcine Collagen Matrix to Augment Width and Thickness of Keratinized Gingiva

The presence of an adequate zone of attached keratinized tissue is generally believed to be conducive to the maintenance of gingival health. The immobile and dense gingival tissue is presumed to act as a barrier that provides better resistance to bacterial and mechanical insults than unattached alveolar mucosa. Exactly how much attached tissue is necessary for the maintenance of gingival health has been a controversial subject in the periodontal literature due to the paucity of well-controlled clinical trials.

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