In Vitro Evaluation of the Effect of Thermocycling on the Shear Bond Strength of Light-Cured Composite and Resin Modified Glass Ionomer Cement Using Different Orthodontic Brackets

Harraa S. Mohammed-Salih, Mohammed Nahidh, Ahmed F. F. Al-Jarad


Background: This study was conducted to investigate and compare the effects of thermocycling on the shear bond strength of two light cured orthodontic bonding materials, namely composite and resin-modified glass ionomer cement that used to bond stain- less steel and Sapphire brackets on human teeth, and to determine the type of bonding failure of these materials.
Materials and Methods: Eighty extracted human premolars were selected and randomly divided into two equal groups each with 40 teeth according to the brackets types. Both groups were subdivided into four groups (n = 10) two of these subgroups bonded with composite one control and the second thermocycled and the other two subgroups bonded with resin-modified glass ionomer cement also one control and the second thermocycled. The sample were stored in water at 37o C for 24 hours, then the control groups were tested while the study groups were thermocycled between 5 o C and 55 o C for 500 cycles. The samples were tested for shear bond strength using an Instron universal testing machine. For adhesive remnant index, the enamel surface and bracket base of each tooth were inspected under magnifying lens (20X) of a stereomicroscope.

Results and Conclusions: The shear bond strength of light-cured composite is higher significantly than resin-modified glass iono- mer cement. Thermocycling decreases the shear bond strength of the sapphire brackets bonded with composite significantly by 60.16%. The most predominant sites of bond failure are within the adhesive itself and between the adhesive and the enamel.


Shear bond strength, Thermocycling, Resin-modified glass ionomer cement, Composite.

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