Yazar "Uysal, E" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • [ X ]
    Öğe
    Effect of storage duration on tensile bond strength of acrylic or silicone-based soft denture liners to a processed denture base polymer
    (Taylor & Francis As, 2005) Mese, A; Güzel, KG; Uysal, E
    Objective. To investigate the effect of storage duration on the tensile bond strength of acrylic and silicone-based denture base materials with liners either heat-cured or auto-cured. Material and Methods. The denture liners investigated were Vertex soft (acrylic-based, heat-cured), Coe soft (acrylic-based, auto-cured), Molloplast-B (silicone-based, heat-cured), and Mollosil plus (silicone-based, auto-cured). The soft liner specimens were 10 x 10 x 3 mm and were processed between two PMMA blocks. They were tested following immersion in water at 37 degrees C for 1 day, 1 week, and 1, 3, and 6 months. Tensile bond strength was measured using a universal testing machine (Testometric Micro 500) at a crosshead speed of 20 mm/min (n = 10 specimens per experimental group). Multiple ANOVA and Tukey HSD were used to analyse the data at a pre-set alpha of 0.05. Results. The results indicate that the tensile bond strength of acrylic-based soft liners is greater than that of silicone-based materials. The bond strength of all lining materials decreases with storage duration; the decrease being greatest for the acrylic-based soft liners. The decrease in bond strength of the auto-cured materials is greater than that of the heat-cured products. Clinical significance. Comparison of the materials in this study indicates that the silicone-based, heat-cured soft liner is superior, based on the tensile bond strength property. Use of silicone-based, heat-cured soft liners may provide better clinical success over a long period. These laboratory results need to be verified by clinical testing.
  • [ X ]
    Öğe
    Evaluation of caries risk factors and effects of a fluoride-releasing adhesive material in children with insulin-dependent diabetes mellitus (IDDM)
    (Taylor & Francis Ltd, 2004) Bolgül, BS; Celenk, S; Ayna, BE; Atakul, F; Uysal, E
    The aims of this study were to evaluate the prevalence and risk factors of dental caries, and to determine whether there is any relationship between a fluoride-releasing adhesive material and the development of dental caries in the first year in children with insulin-dependent diabetics (IDDM). The average age of the subjects was 4-15 years, and they had been suffering from IDDM for at least 2 years. The DMF/df(t) indices of 70 patients were calculated and total HbA(1) (%) (glucose levels of blood) values were recorded from the medical records after clinical examination. The mean DMF/d(t) values of poorly controlled subjects (HbA(1) values over 13%) were significantly higher than those of moderately (HbA(1), 10.0-12.9%) and well-controlled (HbA(1) values, <10%) subjects. The levels of salivary mutans streptococci (MS) and lactobacilli (LB) and the pH of paraffin-stimulated whole saliva were measured in diabetic patients. Salivary MS and LB scores of the poorly controlled subjects were significantly higher (2.5 +/- 0.7 and 2.1 +/- 1.0) than those of the moderately (1.6 +/- 0.9 and 1.1 +/- 0.8) and well-controlled (1.2 +/- 1.0 and 0.8 0.8) subjects. The mean pH values among all subjects were not statistically significant. All dental caries were restored with a fluoride-releasing adhesive material. At the end of the first year, no new caries or lost restorations were observed in these patients. Moreover, the rate of MS in the poorly and moderately controlled subjects was considerably reduced. However, no significant statistical reduction of MS was determined in the well-controlled subjects. The level of lactobacilli in the poorly controlled, moderately controlled, and well-controlled subjects was reduced.