Bond characteristics of different light-cured orthodontic bonding systems

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  • 矯正用光重合型レジン系接着システムの接着性能

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The purpose of this study was to evaluate the shear bond strength of orthodontic brackets to human enamel and the enamel surface morphology using three orthodontic adhesives: PrimeMaster LC, TransBondTM XT and BeautyOrthoBond. Unground enamel of extracted human premolar was treated according to the manufacturer’s instructions. For evaluation, stainless steel brackets were bonded to the enamel surface under ambient conditions (temperature: 23°C, relative humidity: 50±5%) or humid conditions (temperature: 37°C, relative humidity: ≥ 95%) prior to being stored under dH2O at 37°C for 24 h. The specimens treated under ambient conditions were divided into two groups and one was subjected to thermocycling for 5,000 cycles at temperatures alternating between 5 and 55°C. Shear bond strength testing of all specimens was performed using a universal loading machine at a cross-head speed of 1.0 mm/min. Data was statistically analyzed by ANOVA and Tukey’s test, and failure modes were assigned to each specimen. Although the shear bond strength of PrimeMaster LC was comparable to or better than that of TransBondTM XT, the shear bond strength of BeautyOrthoBond was significantly low. After the shear bond strength test, the dominant failure mode showed that there was a difference among the three adhesive systems. PrimeMaster LC indicated that the failure mode was mostly at the enamel/adhesive and cohesive failures within the resin owing to the effect of adhesion promoting monomers, whereas those treated with TransBondTM XT occasionally showed enamel fracture. These findings suggest a difference in bonding performance of the three orthodontic adhesives.

Journal

  • Adhesive Dentistry

    Adhesive Dentistry 31 (4), 159-166, 2013

    Japan Society for Adhesive Dentistry

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