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combinations of aerobic and resistance activities. To investigate the effects of ErYAG laser pre-treatment on the dentin structure and shear bond strength of primary teeth. Dentin specimens were prepared using freshly extracted intact primary molars and divided randomly into four groups based on the surface treatment applied. The control and etchant groups received no treatment and conventional acid etching treatment, respectively, while the energy and frequency groups received laser surface treatment with variable energy (50-300mJ) and