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A gingival graft (also called gum graft or periodontal plastic surgery) is a generic name for any of a number of periodontal surgical procedures in which the gum tissue is grafted. The aim may be to cover exposed root surfaces or merely to augment the band of keratinized tissue.
The soft tissue in the oral cavity is classified as either keratinized or nonkeratinized based on the magnitude of keratin in the epithelium. In health, the soft tissue immediately around the teeth is highly keratinized and is referred to as keratinized tissue or gingiva. The soft tissue that exists adjacent to that and separated from the teeth by the band of keratinized tissue is referred to as alveolar mucosa. Nonkeratinized tissue also lines the lips, cheeks, underside of the tongue and floor of the mouth are also nonkeratinized. The dorsum of the tongue is keratinized and features many papillae, some of which contain taste buds.
Loss of bone and keratinized tissue around the neck of a tooth is referred to as gingival recession. The result of gingival recession is manifold: the often unesthetic root surface may become exposed and because of this, root sensitivity may be manifest. Gingival grafting may be employed to both increase the zone of keratinized tissue and effect root coverage.
When the dimension of the zone of keratinized tissue becomes deficient, either due to trauma or periodontal disease, a gingival graft might be indicated.
Coronally and apically positioned flaps, although technically not grafting procedures, are other forms of a pedicle grafts in that gingival tissue is freed up and moved either coronally or apically. This requires adequate thickness and width of gingival tissue at the base of the recession defect.
A free gingival graft is a dental procedure where a small layer of tissue is removed from the palate of the patient's mouth and then relocated to the site of gum recession. It is sutured (stitched) into place and will serve to protect the exposed root as living tissue. The donor site will heal over a period of time without damage. This procedure is often used to increase the thickness of very thin gum tissue.
A subepithelial connective tissue graft takes tissue from under healthy gum tissue in the palate, which may be placed at the area of gum recession. This procedure has the advantage of excellent predictability of root coverage, as well as decreased pain at the palatal donor site compared to the free gingival graft. The subepithelial connective tissue graft is a very common procedure for covering exposed roots.
A lateral pedicle graft, or pedicle graft, takes tissue from the area immediately adjacent to the damaged gingiva. This is not always an option, as the constraint that there must be sufficient tissue immediately lateral to the area of interest is an onerous one. When this procedure is performed, the transplant tissue is cut away and rotated over the damaged area. This can place the donor area at risk of recession as well.
An acellular dermal matrix (such as Alloderm) graft uses donated medically processed human skin tissue as a source for the graft. The advantage of this procedure is no need for a palatal donor site, and though some periodontists consider it equally successful as a subepithelial connective tissue graft, others consider it less successful.
Guided bone reconstruction is a technique in which bone growth is enhanced by preventing soft tissue ingrowth into the desired area and utilizes either resorbable or nonresorbable membranes. Metallic membranes (von Arx et al. 1996) or membranes supported by a titanium frame (Simion et al. 1994, 1998, 2001) have been tested and have been successful. The acellular dermal matrix has been used as a barrier membrane with demineralized freeze-dried bone allograft.
Through the advent of micro-surgical procedures these procedures have become more predictable and comfortable for the patients. Gum grafts are usually performed by periodontists who are trained in these procedures.
- See article by Wennstrom et al. in the journal Annals of Periodontology, 1996
- See article by Hirsch et al. in the Journal of Periodontology, 2005
- See article by Harris et al. Journal of Periodontology, 2004.