|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|3145469||1197078||2008||6 صفحه PDF||سفارش دهید||دانلود رایگان|
ObjectiveThis study evaluated the bond strengths of four different margin ceramics based on fluoroapatite and feldspath to a zirconia ceramic.MethodsZirconia cores (Zirconzahn) (N = 28, n = 7/margin ceramic group) were fabricated according to the manufacturers’ instructions (diameter: 4 mm; thickness: 2 mm) and ultrasonically cleaned. Four different margin ceramics (thickness: 5 mm) (Cerabien Zr, Noritake; Ceramco PFZ, Ceramco; e.max, Ivoclar Vivadent and Triceram, Dentaurum) were vibrated and condensed in a stainless steel mould and fired onto their zirconia cores. After trying the specimens in the mould for minor adjustments, they were again ultrasonically cleaned and embedded in PMMA. The specimens were stored in distilled water at 37 °C for 1 week and shear bond strength (MPa ± S.D.) tests were performed in a universal testing machine (crosshead speed: 0.5 mm/min). Failure modes were recorded under SEM.ResultsSignificant effect of margin ceramic types were found on the bond strength values (P < 0.05). The mean bond strength values of Ceramco margin ceramic to zirconia was significantly lower (25.4 ± 4.5 MPa) (P < 0.05) than those of Cerabien (31.6 ± 6.4 MPa), e.max (35.9 ± 8.4 MPa), and Triceram margin ceramic (38.8 ± 7.1 MPa) systems.ConclusionsMargin ceramics, compatible with zirconia framework material tested in the present study, exhibited high bond strength values. Variations in thermal expansion coefficients might influence their bond strength values.
Journal: Journal of Dentistry - Volume 36, Issue 10, October 2008, Pages 822–827