Evaluation of Microleakage under Sapphire Brackets Bonded with Three Different Orthodontic Adhesives after Thermocycling and Water Storage (An in Vitro Study)
Keywords:Microleakage; Dye penetration; Sapphire; Adhesive.
Objectives: To evaluate and compare the microleakage between enamel-adhesive, bracket-adhesive
interfaces at occlusal and gingival sides of sapphire brackets bonded with three different light-cure adhesive
systems after thermocycling and 2 months water storage.
Materials and Methods: Sapphire brackets bonded to forty eight intact extracted upper premolar randomly
assigned according to orthodontic adhesive systems used into three equal groups (n=16) with different color
coding: Conventional Transbond XT; Transbond XT plus self-etching primer; Resin-modified glass ionomer
cement (RMGIC) GC Fugi Ortho LC. After bonding and thermocycling, half of samples (8 teeth) in each
group, tested immediately after thermocycling and 24 hours of water storage and the remaining 8 teeth were
incubated in distilled water to be tested after 2 months of water storage. After each storage interval, samples
were subjected to a dye penetration test and examined under a stereomicroscope with image analyzer
software to assess the degree of microleakage in mm. Data was analyzed using the non-parametric tests.
Results: After both storage time intervals, RMGIC group displayed higher microleakage than other groups
with high significant differences with Transbond XT group and more microleakage seen at gingival margin
than occlusal margin in all groups. The microleakage values increased after 2 months storage, but without
Conclusion: The type of adhesive systems could effect the amount of microleakage and higher value
under brackets bonded with RMGIC with more microleakage gingivally than occlusally. The microleakage
increased after thermocycling with 2 months water storage.
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