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Abstract

THE EFFECT OF PARTICLE SIZE OF AL2O3 ON THE BOND STRENGTH OF DENTAL METAL-CERAMIC JOINTS

Ahmed B. Al-Daboo*, Sabiha M. Kanaan and Furat I. Hussein

ABSTRACT

Background: Modern dentistry has led to the development of metalfree
restorations (all ceramic restoration). But, metal ceramic
restorations are still used widely since these restorations have good
clinical performance and low cost. Many studies have been done to
overcome on the failure of ceramic debonding. Objective: To evaluate
the effect of particle size of Al2O3 on the bonding strength of dental
ceramic to the metal framework. Material and method: Twenty metal
samples made by lost wax technique with dimensions (25 x 3 x 0.5
mm), casting from Nickel-Chromium alloy. The metal samples sand
blasting with aluminium oxide , two size of sand particle size are used ,
group A1 sand blasted with 125 μm Al2O3; group A2 sand blasted with
250 μm Al2O3. Ten samples for each group. Then the metal samples
veneered with feld- spathic ceramic layer (8 x 3 x 1.1 mm). The metal-ceramic samples
subjected to three points flexural test to evaluate the bonding strength for each sample. T-test
was used in statistical analysis of this study. Results: the highest bond strength was recorded
with used of 250 μm Al2O3. According to the T-test there is a significant different between
group A1 and A2.

Keywords: Bond strength, Metal-ceramic, Sand blast, Aluminium oxide Al2O3.


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