Title: THE EFFECT OF THREE DIFFERENT AMALGAM SURFACE TREATMENT METHODS ON COMPOSITE- AMALGAM FRACTURE STRENGTH
Abstract: Introduction:
Following increasing people’s demand for having aesthetic, functional and simultaneous benefits of composite and
amalgam restorations, combined restoration of composite-amalgam has been introduced. The aim of this study was
to evaluate the effect of there methods of surface treatment on composite-amalgam fracture strength.
Materials & Methods:
In this experimental invitro study, on thirty uniform and sound human maxillary premolar teeth mesiobuccal class II
cavities were prepared so that in all specimens the thickness of buccal reminder enamel was one millimeter. They
were divided randomly into three groups of ten and filled with amalgam. After 24h in each tooth, thin mesiobuccal
enamel was removed and amalgam surface were veneered with Tetric Ceram composite by one of the three
following methods. In A and B groups after etching with phosphoric acid, Scotchbond Multi-purpose and One Coat
Bond were applied respectively. In group C after sandblasting and acid etching, margin bond unfilled resin was
applied for adhesion of composite to amalgam. Finally for fracture strength measurement, the specimens were
loaded under Instron testing machine at a crosshead speed of 1mm/min with 450
angle. Fracture areas were also
considered from stand point of CEJ location and type of debonding (adhesive – cohesive – mixed). Data were
analyzed with One Way ANOVA and Duncan tests.
Results:
Mean fracture strengths in three methods were significantly different (P=0.02). Group C had the highest and group
B had the lowest fracture strength. In all three groups, the most common type of debonding was adhesive and above
to the CEJ.
Conclusion:
The highest mean value of fracture strength was obtained in group with amalgam sandblasting followed by
application of unfilled resin which did not differ significantly with Scotchbond Multi-purpose group. However it
differed significantly with One Coat Bond group.
Key words:
amalgam veneering, fracture strength, adhesive system, sandblasting.
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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Cited By Count: 1
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