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    A comparative study of translucency and color perception in monolithic zirconia and lithium disilicate veneers
    (Cell Press, 2024) Aydogdu, Hasan Murat; Yıldız, Pınar; Unlu, Damla Gunes
    Ceramic laminate veneers which are a conservative approach to restoring anterior teeth, combining minimal preparation and esthetics. This study aims to evaluate the impact of the thickness of monolithic zirconia laminate veneers on their optical properties and color perception, comparing them to lithium disilicate. A total of 60 laminate veneers were prepared using two ceramic materials, divided into three groups for each material (n = 10) with thicknesses of 0.5, 0.7, and 1.0 mm. CIELab color parameters of the veneers were measured using a spectrophotometer and translucency parameters were calculated. The veneers were cemented onto uniform dies and final L, a, b values of the restorations were measured. The color difference between the different thicknesses was calculated using the CIEDE2000 formula. Two-way ANOVA and Bonferroni HSD post hoc tests were conducted to compare the color parameters (alpha = 0.05). The results showed that both material type (p < 0.001) and thickness (p < 0.001) influenced translucency values. The translucency values of zirconia veneers were significantly lower than those of lithium disilicate. The color differences (Delta E00) resulting from thickness changes (0.5-1.0 mm) were near or below the perception threshold for lithium disilicate, but distinct for zirconia restorations. In conclusion, monolithic zirconia veneers demonstrated lower translucency compared to lithium disilicate. Changing the material thickness affected the translucency of both materials, but not the color perception only for zirconia.
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    Evaluation of periodontal status and interleukin levels in pregnant women with HELLP syndrome
    (Kerman Univ Medical Sciences, 2022) Aydinyurt, Hacer Sahin; Cetin, Orkun; Aydogdu, Hasan Murat; Karaman, Erbil; Taskin, Cem; Sahin, Hanim Guler; Eskin, Kubra
    BACKGROUND AND AIM: Hemolysis, elevated liver enzymes and low platelet (HELLP) syndrome is a pregnancy-specific disease that affects many systems of the body. Its etiopathogenesis has not been fully elucidated. HELLP syndrome is characterized by hemolysis, elevated liver enzymes, and low platelet counts. It has a prevalence of 0.2%-0.8% in pregnant women. This study aimed to compare periodontal status as well as interleukin (IL)-6 and IL-37 levels in gingival crevicular fluid (GCF) of healthy pregnant women and pregnant women with HELLP syndrome. METHODS: This study included 20 patients with HELLP and 20 healthy pregnant women. The clinical periodontal parameters [plaque index (PI), gingival index (GI), bleeding on probing (BOP), probing depth (PD), clinical attachment level (CAL)] were recorded and GCF samples were collected. IL-6 and IL-37 levels were measured in GCF samples using the enzyme linked immunosorbent assay (ELISA) method. The data collected from healthy pregnant women and patients with HELLP were compared with statistical analysis. RESULTS: There was no statistically significant difference between healthy pregnant women and pregnant women with HELLP in terms of periodontal clinical parameters. There was a statistically significant difference in terms of IL-6 levels (P < 0.05); however, no statistically significant difference was determined in terms of IL-37 levels in GCF. CONCLUSION: This is the first study to evaluate periodontal status as well as IL-6 and IL-37 levels in GCF in pregnant women with HELLP syndrome. The results of the study showed that IL-6 levels were significantly higher in pregnant women with HELLP syndrome, but there was no significant difference in terms of other parameters. Further research is needed to evaluate the relationship between HELLP syndrome and periodontal disease.
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    Öğe
    Evaluation of vertical marginal discrepancy and load-to-failure of monolithic zirconia and lithium disilicate laminate veneers manufactured in different thicknesses
    (Bmc, 2024) Yıldız, Pınar; Unlu, Damla Gunes; Aydogdu, Hasan Murat
    ObjectivesThis study aimed to evaluate the feasibility of monolithic zirconia laminate veneers (MZLV) compared to lithium disilicate laminate veneers (LDLV).Materials and methodsSixty resin replicas, each prepared with depths of 0.5 mm, 0.7 mm, and 1 mm, were produced using a 3D printer from acrylic teeth. Laminate veneers of these thicknesses were milled from pre-sintered monolithic zirconia (3rd generation) and lithium disilicate blocks. The intaglio surface of MZLV was treated with air abrasion using 110 mu m diameter silica-modified aluminium oxide particles and ceramic primer, while LDLV was etched with etchant gel and treated with the ceramic primer before cementation with resin cement. Vertical marginal discrepancy (VMD) was assessed using a stereomicroscope, and a load-to-failure test was conducted using a universal testing machine. Failure modes were evaluated macroscopically on fractured surfaces. Data were analysed statistically using Two-way ANOVA and Bonferroni correction (alpha = 0.05).ResultsLDLV samples exhibited significantly larger VMD compared to MZLV samples across all thicknesses, especially in cervical, palatal, and mean data. Within the LDLV group, load-to-fracture values for 0.7 mm and 1.0 mm thicknesses were similar, whereas for 0.5 mm thickness, it was significantly lower. In the MZLV group, load-to-fracture values were lower for 0.7 mm and 1.0 mm thicknesses compared to LDLV, but higher for 0.5 mm thickness.ConclusionsMaterial choice and restoration thickness significantly influence laminate veneer restorations' success. MZLV generally exhibits superior vertical marginal fit compared to LDLV, with varying load-to-failure values across different thicknesses. Clinical management of debonding in MZLV is simpler compared to restoration fracture in LDLV.Clinical relevanceConsidering clinical factors, MZLV may be a preferable option to LDLV for this restoration with the thickness of 0.5 mm.