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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 in
layer all-ceramic crowns and delaminating is the most common failure
reason in the core-veneer interface The core/veneer interface is one of
the weakest aspects of layered all-ceramic crowns[1]
and plays a
significant role in their long-term success.[2,1]
Objective: the objective
of this study to investigate the effect of etching with hydrofluoric acid
and grinding on roughness of heat press (lithium di-silicate) core and
shear bond strength between lithium di-silicate core and veneering
ceramic. Materials and Methods: thirty discs specimens (10mm in
diameter and 3mm in thickness) were prepared according to the
manufacturer's recommendations. polishing was done for all the
samples using silicon carbide abrasive paper 600 grit and then 1200
grit and the surface roughness was measured by Atomic Force
Microscope(AFM) for all the polished surface of the samples (Ra)
which ranged between (66.063 - 69.66 nm) then in a random way the
samples were divided in to three groups as follows: Group 1: no surface treatment (control
group), Group 2: etching with 4.5%HF, Group 3: grinding with wet silicon carbide abrasive
paper 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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