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Template assisted surface microstructuring of flowable dental composites and its effect on microbial adhesion
Nadja Frenzel1, Stefan Maenz2, Vanesa Sanz Beltrán2
1Department of Conservative Dentistry, University Hospital Jena, Friedrich Schiller University, An der alten Post 4, D-07743 Jena, Germany.
Summary
Dental composite surfaces with specific microstructures can reduce bacterial adhesion, potentially lowering the risk of secondary caries. This study explored novel microstructuring techniques for dental composites to improve clinical outcomes.
Area of Science:
- Biomaterials Science
- Dental Materials
- Microbiology
Background:
- Modern dental composites offer esthetic benefits but are prone to secondary caries.
- Microstructured biomaterial surfaces may inhibit microbial adhesion through physical interactions.
- Controlling microbial adhesion is crucial for improving the longevity of dental restorations.
Purpose of the Study:
- To develop a straightforward method for creating microstructured surfaces on dental composites.
- To evaluate the effect of different surface microstructures on oral bacterial adhesion.
- To test the hypothesis that surface microstructures significantly influence microbial adhesion properties.
Main Methods:
- Six dental composites were assessed for microstructuring suitability using polydimethylsiloxane (PDMS) templates.
- The nano-hybrid composite Grandio Flow was successfully microstructured with four distinct patterns (flat, cubes, linear trapezoids, flat pyramids).
- Bacterial adhesion was quantified using colony-forming units (CFUs) and scanning electron microscopy (SEM) after incubation in saliva.
Main Results:
- All tested microstructures were effectively transferred to the Grandio Flow composite.
- Flat composite surfaces exhibited the lowest bacterial adhesion.
- Linear trapezoid structures showed the highest bacterial adhesion, followed by flat pyramids and cubes, indicating a significant influence of microstructure on adhesion.
Conclusions:
- Surface microstructuring of dental composites is a viable clinical strategy to manage microbial adhesion.
- This approach holds potential for reducing the incidence of secondary caries in dental restorations.
- Optimizing composite surface topography, particularly with smaller structures, may enhance anti-adhesion properties.
