Chemically separated connective tissue grafts: clinical application and histological evaluation

Area of Science:

• Oral surgery
• Periodontology
• Tissue engineering

Background:

• Gingival recession is a common dental condition requiring treatment.
• Subepithelial connective tissue grafting is a standard procedure for root coverage.
• Epithelial separation from connective tissue grafts can impact graft outcomes.

Purpose of the Study:

• To evaluate the clinical feasibility of chemically separated subepithelial palatal connective tissue grafts.
• To histologically assess the outcomes of these grafts after 12 months.
• To identify potential complications or modifications needed for the grafting technique.

Main Methods:

• Subepithelial palatal connective tissue grafts were harvested, with epithelium separated chemically (n=5) or surgically (n=2).
• Grafts were used to treat patients with gingival recession.
• Biopsies of grafted tissue and adjacent mucosa were obtained after 12 months for histological examination.

Main Results:

• Histology confirmed keratinization of the newly formed epithelium over the grafts.
• A significant finding was the presence of deep epithelial projections into the connective tissue in most biopsies.
• These projections sometimes formed enlarged areas or cyst-like spaces.

Conclusions:

• Chemical separation of epithelium and connective tissue is clinically feasible for graft preparation.
• The subepithelial connective tissue grafting technique requires modification to prevent undesirable epithelial downgrowth.
• Further research is needed to refine the technique and avoid epithelial invagination for better graft integration.