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Abstract

EVALUATION THE EFFECT OF HYDROFLUORIC ACID AND GRINDING TREATMENT ON SHEAR BOND STRENGTH OF IPS E.MAX PRESS WITH CERAMIC VENEER MATERIAL (AN IN VITRO STUDY)

*Shurooq F. Hasan and Akhlas Z. Abood

Abstract

Back ground: The bond strength is the most common factor success inlayer all-ceramic crowns and delaminating is the most common failurereason in the core-veneer interface The core/veneer interface is one ofthe weakest aspects of layered all-ceramic crowns[1]and plays asignificant role in their long-term success.[2,1]Objective: the objectiveof this study to investigate the effect of etching with hydrofluoric acidand grinding on roughness of heat press (lithium di-silicate) core andshear bond strength between lithium di-silicate core and veneeringceramic. Materials and Methods: thirty discs specimens (10mm indiameter and 3mm in thickness) were prepared according to themanufacturer's recommendations. polishing was done for all thesamples using silicon carbide abrasive paper 600 grit and then 1200grit and the surface roughness was measured by Atomic ForceMicroscope(AFM) for all the polished surface of the samples (Ra)which ranged between (66.063 - 69.66 nm) then in a random way thesamples were divided in to three groups as follows: Group 1: no surface treatment (controlgroup), Group 2: etching with 4.5%HF, Group 3: grinding with wet silicon carbide abrasivepaper under water cooling first with wet 100 grit, then with 220 grit. grinding performed on metallurgical polishing machine. After that, the surface roughness measured by AFM for group 2 and 3. later, randomly selected one sample from each group and prepared for scanning electron microscope to analyze the surface morphology characteristic. Followed by the application of veneer ceramic (IPS e.maxceram, Ivoclar vivadent schaan, leichtenstein). Shear bond strength(SBS) was determined by a universal testing machine at a 1mm/min crosshead speed. The fractured specimens were examined with stereomicroscope to detect the mode of bond failure. Data were analyzed with one way ANOVA test and multi comparison least significant difference (LSD Test), and ROC validity test. Results: the statistical analysis revealed that, the superior roughness value was for group grinding followed by 4.5%HF and the lowest roughness value was related to the control group and the result of shear bond strength indicate that group grinding was higher than the control and HF groups which showed the similar mean value in shear bond strength.

Keywords: Lithium Di-Silicate, Surface Roughness, Shear Bond, Grinding.


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