Farklı Kalınlıklardaki CAD/CAM Zirkonya, Hibrit Seramik ve Rezin Nano-Seramik Onleylerin Kırılma Dayanıklılıklarının In-Vitro Olarak Karşılaştırılması

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2016-12-14Author
Koştur, Emine
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Zirconia
has been used in esthetic cases often. Because of its brittleness new materials are
developed like hybrid ceramic and resin nano ceramic. The aim of this study was to
assess and compare the fracture strength of CAD/CAM zirconia, hybrid ceramic
(Vita Enamic) and resin nano-ceramic (3M ESPE Lava Ultimate ) onlays with different
thickness. Ninety premolars were inserted in acrylic resin patterns, embedding the
root up to 3mm below the cement-enamel junction. A standardized tooth
preparation was applied to all specimens and standardized onlays from the Cerec
database was generated with the Cerec 4 CAD/CAM system. Ninety restorations
were divided into 3 groups as follows: 30 resin nano-ceramic onlays, 30 hybrid
ceramic onlays and 30 Zirconia onlays. Each subgroups (n=10) had 0.5, 1.0 and 1.5
mm thickness. After cementation of restorations, static load was applied to all
specimens. The load at failure was recorded. The results were analyzed by one-way
ANOVA and Tukey tests and P< 0.05 was accepted as significant. For the 0,5 mm
group, the fracture load of Vita Enamic was 1655 N which was significantly higher
than others and zirconia onlays had the lowest fracture load with 825 N. For the 1
mm group there was no significant difference between the materials. For 1.5 mm
group zirconia onlays had the highest fracture load with 2133N while Lava Ultimate
was the lowest one which was 1228N. Zirconia onlays showed, increased fracture
load with increased the restoration thickness. All of the onlays failed above the bite
forces. 0,5 mm zirconia onlays must be used carefully in clinical cases.