Gingival phenotype modification using collagen matrix versus acellular allogenic dermal matrix: A comparative...

Area of Science:

• Periodontology
• Biomaterials Science
• Tissue Engineering

Background:

• Soft-tissue substitutes like acellular dermal matrix (ADM) and collagen matrix (CM) are vital for avoiding autogenous grafting complications.
• Direct preclinical comparisons between ADM and CM for early healing are limited.

Purpose of the Study:

• To compare the early healing and connective tissue remodeling of ADM and CM in a canine model.
• To evaluate histometric, volumetric, and immunohistochemical differences between ADM and CM.

Main Methods:

• A split-mouth canine model with 16 labial sites receiving subperiosteal tunnel grafts of ADM or CM.
• Analysis at 4 and 8 weeks, including 3D intraoral scans for gingival thickness/volume.
• Histometric analysis, rete peg counts, interface morphology, and immunohistochemistry for type I collagen (Col I) and VEGF.

Main Results:

• Both ADM and CM achieved immediate soft-tissue augmentation with partial contraction.
• No significant differences were found between ADM and CM in histometric, 3D, rete peg, or VEGF outcomes at 4 or 8 weeks.
• Histology revealed graft-host apposition at 4 weeks and a collagen-rich interface at 8 weeks, with increased Col I expression in both groups.

Conclusions:

• ADM and CM exhibit similar early healing and connective tissue remodeling profiles in this short-term canine study.
• Both biomaterials effectively promote soft-tissue augmentation and integration.