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KMID : 0362319930180010114
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Journal of Korean Academy of Operative Dentistry
1993 Volume.18 No. 1 p.114 ~ p.121
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A STUDY ON THE SHEAR BOND STRENGTH OF THE COMPOSlTE RESlN TO AMALGAM ACCORDlNG TO AMALGAM SURFACE TREATMENT METHODS
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Abstract
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The purpose of this study was to evaluate the effect on treatment methods to shear bond strength between composite resin and amalgam when the alloy surface was finished with a diamond wheel or an sandblaster.
Forty round acrylic cylinders were fabricated with a diameter of 33mm and a height of 20mm to fit into the device used during shear bond strength testing. A round undercut cavity (diameter, 8mm : depth, 2.5mm) was prepared in the center of the
acrylic
surface and the cavity was restored using a amalgam.
A total of 40 acrylic cylinders with amalgam were divided into 4 groups according to treatment method.
@ES The group treatment were as follows:
@EN Group 1: and etching after finishing the amalgam with diamond wheel
Group 2: no acid etching after finishing the amalgam with diamond wheel
Group 3: acid etching after sandblasting the amalgam
Group 4: no acid etching after sandblasting the amalgam
The shear bond strength of composite resin bonded to amalgam of each specimen was tested with a universal testing machine at a crosshead speed of 0.5mm/min and 500kg in full scale
@ES The results were as follows:
@EN 1. After diamond finishing the non-acid etching group had highest shear bond strength with 7.29kg/cm* and after sandblasting the acidetching group had lowest shear bond strength with 4.49kg/cm*
2. In both diamond finishing and sandblasting group, acid etching of the roughened amalgam surface decreased the shear bond strenght.
3. The group treated with a diamond wheel had higher shear bond strength those treated with an sandblaster but there was not significant.
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KEYWORD
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