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YILDIZ, COŞKUN

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COŞKUN

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Subject: STRENGTH ×

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    Fracture Resistance of Manually and CAD/CAM Manufactured Ceramic Onlays
    (WILEY-BLACKWELL, 2013) EVREN, BUKET; Yildiz, Coskun; Vanlioglu, Burcin Akoglu; Evren, Buket; Uludamar, Altay; Kulak-Ozkan, Yasemin
    PurposeThis in vitro study aimed to evaluate fracture resistance in lithium disilicate onlays fabricated with IPS e.max Press and IPS e.max CAD systems and luted with different adhesive cements. Material and MethodsFifty maxillary first molars were prepared using a mesio-occluso-disto-lingual onlay cavity model. Ten onlays from each group were cemented using etch-and-rinse adhesives and high-viscosity composite resin cement, and 10 were cemented with self-adhesive, dual-curing universal resin cement. Fracture resistance was measured. ResultsSignificant differences were observed between resin cements (p < 0.05) and between materials (p < 0.05), but the interaction of these variables did not produce a significant difference. The fracture resistance of pressable ceramics was significantly higher than that of CAD/CAM onlays (p < 0.05), and Syntac Variolink was significantly higher than that of Multilink Sprint (p < 0.05). ConclusionAll groups showed clinically acceptable fracture strength results. According to the study, both the onlay fabrication system and adhesive cements can be a viable treatment option.
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    Marginal-internal adaptation and fracture resistance of CAD/CAM crown restorations
    (JAPANESE SOC DENTAL MATERIALS DEVICES, 2013) EVREN, BUKET; Yildiz, Coskun; Vanlioglu, Burcin Akoglu; Evren, Buket; Uludamar, Altay; Ozkan, Yasemin Kulak
    This study evaluated the marginal adaptation and fracture resistance of CAD/CAM-fabricated zirconia crowns luted using different luting agents. Twenty crown restorations were produced using IPS ZirCAD zirconium oxide blocks (IZC), and another 20 using Lava zirconium oxide blocks (L). Ten teeth were used as control. Luting agents used were an etch-and-rinse adhesive (Variolink II) and a self-etch adhesive (Multilink Automix). Internal and marginal adaptation was evaluated using silicone replica technique. Fracture resistance was evaluated using a compression test. Marginal discrepancy was 89.26 mu m for L crowns and 88.84 mu m for IZC crowns, and difference was statistically insignificant. However, L crowns showed significantly larger axial and occlusal gaps than IZC crowns (p<0.05). Fracture resistance of IZC-Multilink was higher than the other groups, although the difference was not significant. Results showed that CAD/CAM-fabricated crowns showed acceptable in vitro marginal discrepancies and fracture strengths.