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Resistance to bacterial aggression involving exposed nonresorbable membranes in the oral cavity
1Odontomatologist, Odontoiatric Center, Milan, Italy.
Abstract:
Bacterial colonies split implanted membranes that are exposed to oral biologic fluids as a consequence of dehiscence. The clinical and histologic behavior of 14 implanted polyurethane membranes was observed during the period of exposure to oral fluids for 2, 3, 4, and 6 weeks and without dehiscence (after 8 weeks). Statistical analysis indicated that the decrease in the number of neutrophils after 5 weeks, associated with the increase in the number of activated fibroblasts, cellular debris, giant cells, and aggression of bacteria, was statistically significant (from P < .05 and P < .01 for activated fibroblasts to P <.005 and P < .001 for neutrophilic cells). The increase in bacterial passage through the polyurethane membranes and in the number of giant cells and cellular debris after 8 weeks represents late dissolution of the membranes; the progressive increase of activated fibroblasts is significant because the longer the membrane resists, the better the cells can grow and give way to the process of tissue regeneration.
Insights
Bacterial colonies degrade polyurethane membranes in the mouth, causing dehiscence. Membrane resistance supports tissue regeneration by allowing fibroblast growth over time.
Area of Science:
- Biomaterials Science
- Oral Biology
- Regenerative Medicine
Background:
- Implanted membranes in oral surgery are susceptible to bacterial contamination and dehiscence.
- Bacterial exposure to oral fluids can compromise the integrity of these membranes.
- Understanding membrane behavior under these conditions is crucial for tissue regeneration.
Purpose of the Study:
- To investigate the clinical and histologic effects of bacterial exposure on implanted polyurethane membranes.
- To analyze the host response and membrane degradation over time.
- To determine the relationship between membrane resistance and tissue regeneration.
Main Methods:
- 14 polyurethane membranes were implanted and exposed to oral fluids.
- Clinical and histologic observations were made at 2, 3, 4, 6, and 8 weeks.
- Statistical analysis was performed on cellular and bacterial counts.
Main Results:
- Significant decrease in neutrophils and increase in activated fibroblasts, cellular debris, and giant cells observed after 5 weeks.
- Increased bacterial passage, giant cells, and cellular debris indicated late membrane dissolution after 8 weeks.
- Progressive increase in activated fibroblasts correlated with membrane resistance and tissue regeneration potential.
Conclusions:
- Bacterial colonies cause membrane dehiscence and degradation.
- Membrane integrity influences the host's cellular response, promoting tissue regeneration.
- Polyurethane membranes show potential for supporting regenerative processes when resistant to bacterial degradation.