AN EVALUATION OF THE EFFECT OF ARTIFICIAL SALIVA WITH DIFFERENT PH ON SHEAR BOND STRENGTH OF VENEERING CERAMIC TO METAL AND ZIRCONIA SUBSTRUCTURE (IN VITRO STUDY)
Inas Mohammed and Dr. Zahraa Nazar Alwahab*
ABSTRACT
Background: For the past 40 years the porcelain- fused- to metal
system has been extensively used in fixed partial denture (FPDs) and
still represents the gold standard. Bilayering concept was first adopted
by metal ceramic restoration which involves the fabrication of high
strength framework layered by a high esthetic veneering material.
Zirconia framework substituted metal as a framework material in all
ceramic restoration, due to it high exceptional mechanical properties.
Objective: To evaluate the effects of artificial saliva with different PH
values neutral (7.0), acidic (3.5) and alkaline (10.0) on shear bond
strengths of veneering ceramic to metal and zirconia substructures.
Material and method: Sixty rectangular shape samples were
fabricated from metal and zirconia, have dimensions (9mm length
×4mm width × 4mm height), the surfaces of the rectangular samples
(4mm × 4mm) were veneered with corresponding ceramic according to manufacturer's
instructions. Final thickness of veneered ceramic was 3mm. An artificial saliva solution was
prepared with 3 different pH values (7, 3.5,10) and the 60 samples of zirconia and metal were
divided randomly into 3 solutions with 10 specimens per each group for 21 days in incubator.
Results: the highest mean value for both zirconia and metal core was for neutral artificial
saliva followed by alkaline and acid. ONE – way ANOVA test and LSD showed a high
significant differences among all groups.
Keywords: Shear Bond Strength, Zirconia, Artificial Saliva, Metal Ceramic.
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