The Effect of Laser Irradiation with Different Intensities on the Shear Bond Strength between Mineral Trioxide Aggregate and Glass Ionomer Cement

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Key Points

The research aims to assess how varying laser irradiation intensities affect the bond strength between mineral trioxide aggregate and glass ionomer cement.
Prepared forty MTA specimens and stored them under controlled conditions of 37 °C and 100% humidity for 72 hours.
Divided specimens into four groups: one control (no treatment) and three treated with laser irradiation at different power settings (0.10 W, 0.25 W, 0.50 W).
Applied GIC to all samples following manufacturer instructions and tested shear bond strength using a universal testing machine.
Analyzed failure modes with a stereomicroscope and examined surface morphology with scanning electron microscopy.
The shear bond strength differed significantly between the groups receiving laser treatment and the control group.
Higher bond strengths were observed at specific laser settings, suggesting optimal energy for bonding.
Statistical analysis confirmed significant results using Welch’s ANOVA and post hoc tests.

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Evaluates shear bond strength of MTA and GIC with different laser intensities, indicating optimal conditions for bonding.

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Er et al. (2026) studied this question.

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