Visualization and characterization of Enterococcus faecalis biofilm structure in bovine dentin using 2D and 3D...

Area of Science:

• Dental Research
• Microbiology
• Biomaterials

Background:

• Bacterial biofilms are implicated in dental and periodontal diseases.
• Characterizing biofilms is crucial for clinical and research applications.
• Micro-computed tomography (micro-CT) offers potential for biofilm visualization.

Purpose of the Study:

• To develop a 3D visualization model for biofilms on dentin using micro-CT.
• To evaluate the efficacy of barium sulfate staining for micro-CT biofilm imaging.

Main Methods:

• Dentin blocks were inoculated with Enterococcus faecalis.
• Groups were stained with varying concentrations of barium sulfate or left unstained (control).
• Transmission electron microscopy (TEM), confocal laser scanning microscopy (CLSM), and micro-CT were employed for analysis.

Main Results:

• Barium sulfate successfully penetrated the biofilm structure.
• Barium sulfate staining did not significantly impact viable or total microbial cell densities.
• Micro-CT effectively visualized and measured biofilm thickness on dentin in stained samples.

Conclusions:

• Barium sulfate staining is a viable method for characterizing bacterial biofilms on dentin using micro-CT.
• This technique allows for 3D visualization and thickness measurement of biofilms.
• The method shows no significant adverse effects on microbial cell density.