Yazar "Temizci, Tugba" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • [ X ]
    Öğe
    Candida Albicans Adhesion of New-generation Denture Base Materials
    (2024) Temizci, Tugba; Dogan, Metin; Bozogullari, Hatice Nalan
    ABSTRACT Aim: Denture stomatitis, affecting approximately 65% of denture wearers, is a common symptom of oral candidiasis. With the advancement of digital dentistry, more contemporary materials are being used as denture base materials. The effect of Candida albicans adhesion on new-generation denture bases has not been investigated. This study aims to examine the adhesion of C. albicans to various dental polymers produced by different manufacturing methods and the effect of thermal cycling. Materials and Methods: A total of 60 disk samples (10×2 mm) were produced for microbiological tests. The samples were divided into two subgroups for each material group (n = 10). Three different denture base materials were produced using different techniques: 3 dimensional (3D) printed denture base resin, Formlabs (FL); conventional heat-polymerized acrylic, Meliodent (MD); and milled pre-polymerized polymethyl methacrylate (PMMA) resin disc manufactured using computer aided design/computer aided manufacturing (CAD/CAM) technology, Ivobase (IB). Before and after thermocycling, specimens were tested (5000 cycles, 5 °C/55 °C). The adhesion of C. albicans on the samples was examined under a microscope. Surface images of all groups were evaluated using scanning electron microscopy (SEM). Post-hoc Tukey test and two-way analysis of variance were used to analyze the data. Results: The CAD/CAM milled group and the 3D printed group showed significantly less C.albicans adhesion compared to the heat-polymerized acrylic resin. The effect of thermal cycling on microbial adhesion was found to be insignificant for all groups tested. Conclusion: Candida infections and associated denture stomatitis are less common in new-generation denture base materials compared to conventional heatpolymerized acrylic. To reduce microbial adhesion, denture base materials produced by 3D printing and milled by CAD/CAM could be a better choice.
  • [ X ]
    Öğe
    Evaluation of the Color Stability, Stainability, and Surface Roughness of Permanent Composite-Based Milled and 3D Printed CAD/CAM Restorative Materials after Thermocycling
    (Mdpi, 2023) Bozogullari, Hatice Nalan; Temizci, Tugba
    With the developments in digital dentistry in recent years, subtractive and additive manufacturing and materials have emerged for the production of dental restoration. Novel permanent composite-based restorative materials are also among these materials. Because of their variety and increased use by clinicians, it is also important to know the properties, such as surface roughness and color stability, that are necessary for the longevity of these new materials. This study aimed to investigate the color stability, stainability, and surface roughness (Ra) of additively and subtractively manufactured permanent composite-based restorative materials and compare them with a feldspathic glass ceramic. Two different subtractively manufactured composite-based blocks (Cerasmart 270, Vita Enamic), two different additively manufactured permanent composite-based resins (Crowntec and Permanent Crown Resin), and one feldspathic glass ceramic (Vita Mark II) as a control were compared. A total of 150 specimens were prepared (10 per material for surface roughness and 20 per material for color stability and stainability). The Ra values and the color parameters were measured before and after thermocycling. The specimens of the staining test were then divided into two subgroups and stored for 7 days in distilled water (control) or coffee. The color parameters were remeasured after the storage period. The color differences ( increment E00) were evaluated for each measuring range, and these values are interpreted in terms of clinical perceptibility (Delta E00 <= 1.30) and clinical acceptability (Delta E00 <= 2.25) thresholds. All data were statistically analyzed (alpha = 0.05). While Vita Enamic exhibited the highest mean Ra, Crowntec showed the lowest mean Ra after thermocycling. Crowntec had the highest mean Delta E00 both after thermocycling and storage in solutions. While Vita Mark II displayed the lowest mean Delta E00 after thermocycling. Cerasmart 270 showed the lowest stainability in coffee. All tested materials showed acceptable surface roughness after thermocycling that was equal to or below the plaque accumulation threshold of 0.2 mu m. However, the mean Delta E00 of tested materials were lower than clinical acceptability thresholds, except for Crowntec in all measuring ranges and Vita Enamic immersed in coffee.