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    Adhesion of candida albicans and candida parapsilosis to different restorative materials
    (Cumhuriyet University Faculty of Dentistry, 2019) Arslan, Soley; Koç, Ayse Nedret; Avci, Burhanettin; Balkaya, Hacer; Çakir, Nazire Nurdan
    Objectives: The aim of this study is to compare the susceptibility of seven different restorative materials (three conventional composite resins, two bulk-fill composite resins, one giomer, and one high viscosity glass ionomer material) to adhere Candida albicans and Candida parapsilosis. Materials and methods: In this study, thirty cylindrical specimens of each material were made according to instructions of the manufacturers. The surface roughness of the specimens was assessed using a profilometer. Thereafter, the specimens were incubated with a reference strain of Candida albicans (ATCC 64548) and Candida parapsilosis (ATCC 22019). The proliferated colonies counted as CFU/ml. One-way analysis of variance (ANOVA) was used to evaluate the surface roughness and the adhesion value of the materials. Tukey's post-hoc test was used for subsequent pairwise comparisons. Results: There was a statistically significant difference between the groups in terms of the surface roughness of the materials (p<0.05). The high viscosity glass ionomer material exhibited significantly higher surface roughness values while X-trafil (a bulkfill composite resin) had the lowest surface roughness values. Also, there was a significant difference between Candida adhesion values of the materials (p<0.05). Conclusions: There was no significant relationship between surface roughness and adhesion of Candida albicans and Candida parapsilosis. Involvement was seen more for Candida albicans compared to Candida parapsilosis in all restorative materials. © 2019 Cumhuriyet University Faculty of Dentistry.
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    Effect of Various Surface Treatments Applied on Glass Fiber Post and Universal Adhesives on Microtensile Bond Strength and Investigation of Surface Properties with EDX
    (Korean Fiber Soc, 2023) Ekrikaya, Semiha; Demirbuğa, Sezer; Kilinc, Nazire Nurdan Cakir; Avci, Burhanettin
    The purpose of this study is to investigate the effects of various surface treatments and universal adhesives on the changes in the glass fiber posts (GFPs) surface and the bond strength between resin cement-post and core composite-post. A total of 20 groups (n = 16) were formed, 10 groups for resin cement and 10 groups for core composite. Various surface treatments, including acid etching and silane application, and two different universal adhesives (Single bond Universal, All Bond Universal) were applied. After various surface treatments and adhesives were applied to the GFPs surface, the surface properties were examined by energy-dispersive X-ray spectroscopy (EDX) analysis. Standard silicone molds were prepared to bond the resin cement and core composite with the GFPs. The serial 1 mm thickness bar was taken from each sample. Microtensile bond strength (& mu;TBS) test was performed and failure modes were evaluated by scanning electron microscopy (SEM). Statistical analysis was performed using a two-way analysis of variance and Tukey's post hoc tests (p = 0.05). The bond strength values of the groups that applied 37% orthophosphoric acid (OPA), silane, and universal adhesive to the GFPs surface before the resin cement and core composite were statistically significantly higher than the control group (p < 0.05). In the resin cement study, the group using silane and Single Bond Universal showed higher bond strength than the other groups (p < 0.05). Acid etching and silane application before the use of universal adhesives increased the & mu;TBS in both resin cement and core composite groups.