Aims: The study aimed to assess the tensile bond strength of modified-Heliosit orthodontic adhesive with different concentrations of seashell or zirconium oxide nanoparticles. Materials and methods: Thirty-five sound-extracted human premolars were collected. Hydroxyapatite nanoparticles were manually prepared from natural snail seashells. https://www.diegojavierfares.com/special-pick-Foxfarm-Ocean-Forest-Garden-Potting-Soil-Bags-6-3-6-8-pH-1-5-Cu-Ft-4-Pack-p38700-great-pick/