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Colonization of retrieved polytetrafluoroethylene membranes: morphological and microbiological observations
1Department of Periodontology, University of Connecticut School of Dental Medicine, Farmington.
Abstract:
Polytetrafluoroethylene membranes (ePTFE) used in guided tissue regeneration (GTR) are accessible to colonization by oral bacteria. The bacterial composition of the adherent biomass is unknown. We examined a total of 6 membranes that were retrieved after 4 to 6 weeks from human periodontitis sites, using optical and transmission electron microscopy (TEM) as well anaerobic cultivation. Five of the 6 membranes provided the microbiological data and microscopic data. TEM revealed an organized microbial mass covering the surfaces and also within the interstices of the open microstructure and occlusive portions of the membranes. Numerous bacterial forms including cocci, rods, and filaments with an interbacterial matrix, frequently in microcolonies, were identified. Anaerobic cultivation yielded Streptococcus and Actinomyces species with a minor component of Gram-negative facultative rods comprised mainly of Haemophilus species. Candida species was recovered from one membrane. These data show that ePTFE is heavily colonized by oral bacteria during retention. The impact of bacterial colonization of ePTFE is not known but it seems reasonable to assume that colonization of membranes may affect connective tissue regeneration. Further studies will be needed to examine the effect of systemic antimicrobials on ePTFE colonization and in turn to examine the effect on GTR.
Insights
Polytetrafluoroethylene (ePTFE) membranes used in guided tissue regeneration are colonized by oral bacteria. This bacterial presence may impact connective tissue regeneration, requiring further investigation.
Area of Science:
- Biomaterials Science
- Oral Microbiology
- Regenerative Medicine
Background:
- Polytetrafluoroethylene (ePTFE) membranes are utilized in guided tissue regeneration (GTR) procedures.
- The potential for oral bacteria to colonize these ePTFE membranes is a significant concern.
- The specific bacterial composition adhering to ePTFE membranes in vivo remains largely uncharacterized.
Purpose of the Study:
- To investigate the microbiological profile of oral bacteria colonizing ePTFE membranes used in GTR.
- To characterize the structure of bacterial biomass on retrieved ePTFE membranes.
Main Methods:
- Analysis of 6 ePTFE membranes retrieved from human periodontitis sites after 4-6 weeks.
- Utilized optical microscopy and transmission electron microscopy (TEM) for structural analysis.
- Employed anaerobic cultivation techniques to identify bacterial species.
Main Results:
- TEM revealed extensive, organized microbial colonization on and within the ePTFE membrane microstructure.
- Identified diverse bacterial forms including cocci, rods, and filaments, often forming microcolonies with an interbacterial matrix.
- Anaerobic cultures yielded Streptococcus and Actinomyces species, with a minor presence of Haemophilus species; Candida was found on one membrane.
Conclusions:
- ePTFE membranes are heavily colonized by oral bacteria during their indwelling period in GTR sites.
- The impact of this bacterial colonization on connective tissue regeneration is currently unknown.
- Further research is warranted to explore the effects of antimicrobials on ePTFE colonization and subsequent GTR outcomes.