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Updated: Jun 26, 2026

Oral Biofilm Analysis of Palatal Expanders by Fluorescence In-Situ Hybridization and Confocal Laser Scanning Microscopy
Published on: October 20, 2011
Biofilm in nasal polyps
Ranko Mladina1, Gorazd Poje, Katarina Vuković
1ORL Department, Clinical Hospital Centre Zagreb, Croatia
Introduction:
Bacterial biofilms are involved in many human bacterial infectious processes and in chronic rhinosinusitis as well. The aim of this study was to determine whether biofilm exists in nasal polyps, both in diffuse nasal polyposis (DNP) and antrochoanal polyps (ACP).
Method:
Tissue samples were taken from seven patients suffering from DNP and three patients suffering from ACP, based on the defined patient inclusion and exclusion criteria. After the preparation, the tissue samples were analyzed by means of scanning electron microscopy (SEM) for signs of biofilm formation.
Results:
Signs of biofilm presence were found in all DNP patients. In ACP cases, biofilm was found in the stalk and nasal, polypoid part of the ACP, whereas there were no signs of biofilm on diseased mucosa of the posterior wall of the maxillary sinus.
Conclusions:
Our preliminary study showed a possible role of bacterial biofilm in pathogenesis and maintenance of both DNP and ACP. There are no obvious differences in the SEM appearance of biofilms in DNP and ACP. Future research is needed to explain why biofilm is present in cases of diffuse nasal polyposis and at the nasal part of ACP, but not on the maxillary sinus part of ACP.
Insights
Bacterial biofilms were detected in all diffuse nasal polyposis (DNP) and antrochoanal polyps (ACP) samples. This suggests biofilms may play a role in the development and persistence of these nasal polyps.
Area of Science:
- Otorhinolaryngology
- Microbiology
- Pathology
Background:
- Bacterial biofilms are implicated in numerous human infections, including chronic rhinosinusitis.
- Understanding biofilm presence in nasal polyps is crucial for managing related conditions.
Purpose of the Study:
- To investigate the existence of bacterial biofilms in nasal polyps.
- To compare biofilm presence in diffuse nasal polyposis (DNP) and antrochoanal polyps (ACP).
Main Methods:
- Tissue samples from seven DNP patients and three ACP patients were analyzed.
- Scanning electron microscopy (SEM) was employed to identify biofilm formation.
Main Results:
- Biofilm presence was confirmed in all analyzed DNP samples.
- In ACP cases, biofilms were observed in the stalk and nasal polyp portions, but not on the maxillary sinus mucosa.
Conclusions:
- Preliminary findings indicate a potential role for bacterial biofilms in the pathogenesis of DNP and ACP.
- SEM analysis revealed no distinct differences in biofilm appearance between DNP and ACP.
- Further research is warranted to elucidate the differential distribution of biofilms in ACP.
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