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Coating Agents for Resin Composites: Effect on Color Stability, Roughness, and Surface Micromorphology Subjected to Brushing Wear.
Oper Dent
January 2025
*Roberta Tarkany Basting, DDS, MSc, PhD, Professor, Restorative Dentistry Department, Faculdade São Leopoldo Mandic, São Paulo, Brazil.
This study evaluated the influence of six resin composite coating agents on color stability and surface roughness after toothbrushing abrasion. Discs (Ø6 mm x 2 mm) of nanofilled resin composite (Filtek Z350XT) were prepared for application of coating agents (n=10): control (absence), two surface sealants (PermaSeal and BisCover LV), two adhesive systems (Scotchbond Multi-Purpose Adhesive/3M Oral Care and Single Bond Universal), and two modeling liquids (Modeling Resin and Composite Wetting Resin). CIELab*, WID, and color change (ΔEab, ΔE00, and ΔWID) were analyzed at baseline, after finishing and polishing, after application of coating agents, after coffee staining (simulating 30 days and one year of staining), and after toothbrushing abrasion.
View Article and Find Full Text PDFEffect of nanogold incorporation into polymethyl methacrylate denture bases on microbial activity in implant-retained mandibular overdentures.
Int J Implant Dent
January 2025
Lecturer at removable prosthodontic department, Faculty of dental medicine for Girls, Al-Azhar University, Cairo, Egypt.
Article Synopsis
- A clinical trial tested the effectiveness of adding nanogold particles to denture bases made of polymethyl methacrylate (PMMA) against standard acrylic bases, focusing on their impact on bacterial growth.
- Twenty-two male patients with no teeth received either traditional acrylic dentures or those enhanced with nanogold, and microbial growth was measured over time around the implants.
- Results showed that dentures with nanogold significantly reduced bacteria counts (Candida albicans, Escherichia coli, and Streptococcus mutans) at 2, 4, and 6 months compared to traditional dentures, suggesting a promising improvement in oral hygiene.
Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material.
J Vis Exp
December 2024
School of Engineering and Materials Science, Queen Mary University of London.
Article Synopsis
- The study evaluates the fracture strength of 1 mm-thick CAD/CAM occlusal veneers made from lithium disilicate (LD) and resin nanoceramics (RNC) to assess their viability in dental restoration.
- Using a novel testing protocol, the RNC group demonstrated a significantly higher load-bearing capacity compared to the LD group, indicating better durability under stress.
- Both materials experienced similar crack patterns during testing, emphasizing the importance of understanding mechanical properties for ensuring the longevity of dental restorations.
Comparison of Ceramic Bonding to Cobalt-Chromium, Zirconia and Nickel-Chromium Alloys Fabricated Using of Various Techniques.
J Biomed Mater Res B Appl Biomater
January 2025
Dental Materials Unit, Center for Dental Medicine, Clinic for Masticatory Disorders and Dental Biomaterials, University of Zurich, Zurich, Switzerland.
The purpose of this study was to evaluate the characteristics of the ceramic bonding to cobalt-chromium (Co-Cr) alloys fabricated by casting, milling, and additive manufacturing, compared with zirconia and nickel-chromium. One hundred specimens (N = 100), prepared with the dimensions of 25 × 3 × 0.5 mm, were assigned to five groups (n = 20): presintered milled Co-Cr (Group M), additively manufactured Co-Cr (Group SLM), cast Co-Cr (Group C), presintered zirconia (Group Zi), and cast Ni-Cr (Group Ni).
View Article and Find Full Text PDFDesign of 3D printed chip to improve sensitivity of platelet adhesion through reinjection: Effect of alcohol consumption on platelet adhesion.
Biomicrofluidics
January 2025
School of Mechanical Engineering, Pusan National University, Busan, South Korea.
Monitoring platelet aggregation is crucial for predicting thrombotic diseases and identifying the risk of bleeding or resistance to antiplatelet drugs. This study developed a microfluidic device to measure platelet activation with high sensitivity. By controlling exposure time through repeated reinjections, the device enables the detection of subtle changes in platelet activity influenced by lifestyle factors, such as alcohol consumption.
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