The aim of this study was to investigate and understand bacterial adhesion to different dental material surfaces like amalgam, Chromasit, an Co-Cr alloy, an IPS InLine ceramic, yttrium stabilized tetragonal polycrystalline zirconia (TPZ), a resin-based composite, an Au-Pt alloy, and a tooth. For all materials, the surface roughness was assessed by profilometry, the surface hydrophobicity was determined by tensiometry, and the zeta potential was measured by electrokinetic phenomena. The arithmetic average roughness was the lowest for the TPZ ceramic (R_a = 0.23 µm ± 0.02 µm), while the highest value was observed for the Au-Pt alloy (R_a = 0.356 µm ± 0.075 µm). The hydrophobicity was the lowest on the TPZ ceramic and the highest on the Co-Cr alloy. All measured streaming potentials were negative. The most important cause of tooth caries is the bacterium Streptococcus mutans, which was chosen for this study. The bacterial adhesion to all material surfaces was determined by scanning electron microscopy. We showed that the lowest bacterial extent was on the amalgam, whereas the greatest extent was on tooth surfaces. In general, measurements showed that surface properties like roughness, hydrophobicity and charge have a significant influence on bacterial adhesion extent. Therefore, dental material development should focus on improving surface characteristics to reduce the risk of secondary caries.

Restorations in dentistry must reproduce the aspect of the patient’s natural teeth and require non-toxicity, biocompatibility, and good mechanical properties in order to last longer. Restorations are permanently in contact with microbes that can adhere to and form biofilms. The purpose of this study was to determine the adhesion extent of Streptococcus mutans to polymethyl methacrylate (PMMA) resin base containing TiO₂ nanoparticles. To understand the adhesion of Streptococcus mutans on the modified resin-based surfaces, the following surface properties were measured: the roughness, contact angle, zeta potential and CIE color parameters. Evaluation of tensile stress performance in TiO2 modified PMMA showed that the maximum tensile stress of the modified PMMA resin decreases with an increasing amount of TiO₂ nanoparticles. The increasing amount of TiO₂ decreases the roughness and causes contact angles in the border between hydrophilic and hydrophobic surfaces. All the studied surfaces are negatively charged and added TiO₂ tends to increase the zeta potential. The addition of TiO₂ nanoparticles increases the lightness and decreases the intensity of the red and yellow color. The increasing addition of TiO₂ nanoparticles into PMMA increases the morphological change of bacterial cells.

Prosthetic and orthotic parts, such as prosthetic socket and inner sides of orthoses, are often in contact with human skin, giving bacteria the capability to adhere and form biofilms on the materials of those parts which can further cause infections. The purpose of this study was to determine the extent of bacterial adhesion of Staphylococcus aureus and Staphylococcus epidermidis on twelve different prosthetic and orthotic material surfaces and how roughness, hydrophobicity, and surface charge of this materials affect the adhesion. The roughness, contact angle, zeta potential of material surfaces, and adhesion rate of Staphylococcus aureus and Staphylococcus epidermidis were measured on all twelve prosthetic and orthotic materials, i.e., poly(methyl methacrylate), thermoplastic elastomer, three types of ethylene polyvinyl acetates (pure, with low-density polyethylene and with silver nanoparticles), silicone, closed-cell polyethylene foams with and without nanoparticles, thermo and natural cork, and artificial and natural leather. The greatest degree of adhesion was measured on both closed-cell polyethylene foams, followed by artificial thermo cork and leather. The lowest adhesion extent was observed on ethylene-vinyl acetate. The bacterial adhesion extent increases with the increasing surface roughness. Smaller deviations of this rule are the result of the surface’s hydrophobicity and charge.

Antimicrobial resistance (AMR) is a growing threat to global health, accelerated by the widespread inappropriate use of antibiotics. Although educational initiatives have been launched worldwide, there is little evidence on how younger generations in high-income countries (HICs) understand and address AMR. Addressing the AMR crisis requires proactive education of younger generations, including children, adolescents, and young adults, who will shape future healthcare practices. This review analyzes existing research on AMR literacy among these age groups in HICs, as knowledge gaps and risky behaviors persist even in HICs, despite their strong education and health infrastructures. The purpose of this review is to examine the knowledge, attitudes, and behaviors related to antibiotic use and antibiotic resistance in younger generations while identifying effective educational interventions. Methods: We performed a comprehensive literature search in PubMed until June 2025, followed by AI-assisted screening (Claude 4.0 Sonnet) and a manual review. The search strategy combined terms from the areas of health literacy, antibiotics, antibiotic resistance/AMR, and young populations. Studies in HICs that examined the younger generation’s knowledge about antibiotics and AMR, analyzed their attitudes or behavior toward them, or evaluated relevant educational interventions were included. Data were synthesized thematically across all included studies. Results: Nineteen studies from 11 HICs were included, including thirteen cross-sectional surveys and six educational intervention studies. The results showed that misconceptions about how antibiotics work are still very common. Several of those asked (22–80%) incorrectly stated that resistance develops in the human body and not in bacteria. Many (26–77%) mistakenly agreed with the statement that antibiotics treat viral infections. Concerning behaviors included high rates of self-medication, non-adherence to treatment, and unsafe storage practices. Several authors propose an amendment of curricula. Educational interventions, particularly gamification and peer education approaches, showed improvements in knowledge and sustained learning outcomes. Conclusions: Knowledge of AMR among young people in HICs is still inadequate, despite educational advantages. Most existing studies focus on college students, while children and adolescents, crucial groups for early prevention, are underrepresented. Targeted, age-appropriate education employing interactive methods represents an evidence-based strategy to improve antibiotic use behavior and support global AMR control efforts.

Full and partial restorations in dentistry must replicate the characteristics of the patient’s natural teeth. Materials must have good mechanical properties and be non-toxic and biocompatible. Microbes, which can form biofilms, are constantly in contact with restorations. In this study, we investigate how well Candida albicans adheres to a polymethyl methacrylate (PMMA) resin base with gold (Au) nanoparticles. We synthesized Au nanoparticles and characterized them. The average size of Au nanoparticles embedded in PMMA was 11 nm. The color difference ΔE between PMMA and PMMA/Au composites was 2.7 and was still esthetically acceptable to patients. PMMA/Au surfaces are smoother and more hydrophilic than pure PMMA surfaces, and the isoelectric point of both types of surfaces was 4.3. Above the isoelectric point, PMMA/Au surfaces are more negatively charged than PMMA surfaces. The added Au nanoparticles decreased the tensile strength, while the hardness did not change significantly. Adhesion measurements showed that PMMA surfaces modified with Au nanoparticles reduced the extent of microbial adhesion of Candida albicans.

The application of catheters to the urinary tract is associated with nosocomial infections. Such infections are one of the most common types of infections in hospitals and health care facilities and can lead to numerous medical complications. Therefore, the understanding of the properties of urinary catheter surfaces and their potential modifications are crucial in order to reduce bacterial adhesion and subsequent biofilm formation. In our study, we consider standard polyvinyl chloride (PVC) catheter surfaces and compare their properties with the properties of the same surfaces coated with poly(diallyldimethylammonium chloride)/poly(sodium 4-styrenesulfonate) (PDADMA/PSS) polyelectrolyte multilayers. Uncoated and coated surfaces were characterized by means of roughness, hydrophobicity, and zeta potential measurements. Finally, bacterial adhesion extent of uropathogenic Escherichia coli on bare and polyelectrolyte multilayer coated surfaces was measured. The obtained results show that on non-treated surfaces, biofilm is formed which was not the case for multilayer coated surfaces. The PSS-terminated multilayer shows the lowest bacterial adhesion and could be helpful in prevention of biofilm formation. The analysis of the properties of the uncoated and coated surfaces reveals that the most significant difference is related to the charge (i.e., zeta potential) of the examined surfaces, while roughness and hydrophobicity of the examined surfaces are similar. Therefore, it could be concluded that the surface charge plays the crucial role in the bacterial adhesion on uncoated and coated PVC catheter surfaces.