# Plasma-Coated Collagen Membranes Gain Barrier Function Through Heat Treatment

## TL;DR

Heating plasma-coated collagen membranes improves their barrier function but reduces mineralization within the membrane during bone regeneration.

## Contribution

Thermal treatment of plasma-coated collagen membranes enhances barrier properties while preserving membrane structure.

## Key findings

- Thermally treated membranes showed mineralization predominantly outside the membrane structure.
- Room-temperature membranes allowed mineral deposition and bone formation within their structure.
- Heat treatment shifts membrane behavior toward barrier function at the expense of intramembranous mineralization.

## Abstract

Guided bone regeneration (GBR) relies on barrier membrane integrity to prevent soft-tissue ingrowth. Although collagen membranes are widely used, their limited longevity can compromise space maintenance, underscoring the need for strategies that enhance membrane stability without impairing the regenerative potential. We hypothesized that thermal denaturation of platelet-poor plasma (PPP), combined with heat-induced modifications of collagen fibrils, could generate a volume-stable, plasma-rich composite that preserves membrane structure and restricts cellular penetration. To test this proof-of-principle concept, collagen membranes were soaked in PPP and either kept at room temperature or subjected to thermal treatment (75 °C/10 min) prior to implantation in rat calvarial defects. Bone regeneration and membrane behavior were evaluated after three weeks using micro-computed tomography (micro-CT) and histology. Micro-CT suggested only minor numerical differences in mineralized tissue between groups; however, these data should not be overinterpreted because micro-CT cannot differentiate mineralization formed within the collagen membrane from mineralization adjacent to it. Consistent with this limitation, histology demonstrated that mineral deposition and early bone formation extended into the structure of room-temperature PPP membranes, whereas mineralized tissue in the thermally treated group was predominantly located outside the membrane, indicating reduced osteoconductive integration within the membrane. Together, these findings support that thermal denaturation of PPP shifts early composite membrane behavior toward barrier-dominant characteristics at the expense of intramembranous mineralization.