Korean J Orthod.  2009 Oct;39(5):320-329.

Effect of metal primer and thermocycling on shear bonding strength between the orthodontic bracket and gold alloy

• Lee YK
• Cha JY
• Yu HS
• Hwang CJ

Abstract

OBJECTIVE
The aim of this study was to evaluate the effect of metal primers and thermocycling on shear bond strength between the orthodontic bracket and gold alloy.
METHODS
For this study, 80 specimens made of dental gold alloy were divided into 8 groups based on the combination of metal primers (none, Alloy primer, Metaltite, V-primer) and thermocycling (with and without thermocycling). Shear bond strength testing was performed with a universal testing machine. Bond failure sites were classified by a modified ARI (Adhesive Remnant Index) score.
RESULTS
All metal primer treated groups showed a significantly higher shear bond strength than the only sandblasting treated group without thermocycling (p<0.05). There were no significant differences on shear bond strength in the groups with thermocycling (p>0.05). Bond failure sites of the metal primer treated group without thermocycling occurred at gold alloy/adhesive interface, whereas there were no differences on bonding failure sites in the groups with thermocycling.
CONCLUSIONS
These findings suggest that using metal primer on gold alloy enhances the initial bracket bond strength. But, this effect was not shown with thermocycling.

Keyword

Bond strength; Bracket; Gold alloy; Metal primer

MeSH Terms

Alloys
Collodion
Methacrylates
Orthodontic Brackets
Thiones
Thiouracil
Alloys
Collodion
Methacrylates
Thiones
Thiouracil

Figure

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  Fig. 1 Equipment and technique for measuring shear bond strength. A, Instron® machine (Model 3345, Instron Co. USA); B, schematic illustration for testing the shear bond strength.

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