Shear bond strength of an adhesive system with antibacterial agents used in Orthodontics

Leonardo de Aquino Fleischmann, Márcio Costa Sobral, Fernando Habib


Purpose: To evaluated shear bond strength to enamel of orthodontic brackets bonded with different combinations of composite/adhesive. This study specifically tested an adhesive with antimicrobial agents added to its composition.
Methods: Orthodontic brackets were bonded to the flattened enamel surface of 20 bovine incisors. Two experimental group were tested (n=10/group): group 1 (Fill Magic Ortodôntico®/ Magic bond®) and group 2 (Transbond XT®/Clearfil Protect Bond®, which has antimicrobial agents). The specimens were subjected to the shear bond strength test at 1mm/min. The maximum strength recorded to dislodge the bracket was converted into MPa considering the bond area. The Residual Adhesive Index (RAI) was evaluated on the debonded brackets.
Results: Group 2 had higher bond strength than group 1 (P=0.001). For RAI assessment, both groups showed failure at the enamel/adhesive interface with retention of most adhesive on the bracket base.
Conclusion: The two groups are suitable for bonding orthodontic brackets, and the group with the adhesive containing antimicrobial agents showed higher bond strength than the group with conventional adhesive.
Key words: Shear strength; adhesives; products with antimicrobial action


Shear strength; adhesives; products with antimicrobial action

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e-ISSN: 1980-6523

ISSN-L: 0102-9460


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