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Effects of surface treatment on orthodontic bonding to amalgam
Jonathan W Skilton1, Martin J Tyas, Michael G Woods
1School of Dental Science, The University of Melbourne, Melbourne, Victoria, Australia.
Aim:
This study aimed to compare the shear bond strengths of metal brackets bonded to amalgam surfaces.
Methods:
One hundred and fifty amalgam samples were fabricated and either polished, roughened with a diamond bur or sandblasted with 50 mm aluminium oxide. Following thermocycling the shear bond strengths were tested and compared with control samples bonded to etched enamel.
Results:
Concise resin composite, Metal Primer/Concise resin composite and All-Bond II/Concise resin composite bonded to sandblasted amalgam gave the highest mean shear strengths and were statistically similar to the etched enamel/Concise resin composite controls.
Conclusion:
One would expect sandblasted amalgam surfaces to be associated with higher shear bond strengths than diamond bur roughened or polished amalgam surfaces.
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