Stromal Cells Associated with Soft Tissue Augmentation by a Volume-Stable Collagen Matrix (VCMX) Are Predominated by...

Area of Science:

• Oral surgery
• Tissue engineering
• Immunohistochemistry

Background:

• Peri-implant soft tissue augmentation is crucial for dental implant success.
• Understanding the cellular response to biomaterials like porcine cross-linked collagen matrix (VCMX) is essential for optimizing wound healing.
• The immunophenotypes of stromal cells post-augmentation require detailed investigation.

Purpose of the Study:

• To define the immunophenotypes of stromal inflammatory cells, endothelial cells, and fibroblasts.
• To analyze cellular changes 3 months after VCMX augmentation of peri-implant soft tissue.
• To investigate the role of specific cell types in the wound healing process.

Main Methods:

• Obtained peri-implant soft tissue samples from 12 patients before and 3 months after VCMX augmentation.
• Utilized immunohistochemical stains to identify T lymphocytes (CD3), B lymphocytes (CD20), plasma cells (CD138), macrophages (CD68, CD163), endothelial cells (CD31, CD34), and fibroblasts (CD90, TE-7).
• Analyzed differences in cell counts using the Wilcoxon signed-rank test.

Main Results:

• Increased mean numbers of CD31+ endothelial cells were observed post-augmentation in both masticatory mucosa (MM2 vs. MM1, P=.025) and lining mucosa (LM2 vs. LM1, P=.047).
• Significantly higher mean numbers of CD163+ anti-inflammatory macrophages were found post-augmentation (MM2 vs. MM1, P=.021; LM2 vs. LM1, P=.012).
• No significant changes were noted for other cell phenotypes.

Conclusions:

• The VCMX wound healing process at 3 months is characterized by an increase in anti-inflammatory CD163+ macrophages and CD31+ endothelial cells.
• These findings offer novel insights into the stromal cell response to VCMX.
• Further research is warranted to explore therapeutic strategies for modulating VCMX-related healing.