Modified Orthodontic Adhesive with Seashell and Zirconium Oxide Nanoparticles and their Effect on Shear bond strength: In-vitro Study
Author(s): Alaa Gharis Adnan and Neam Agha*
Abstract
Aims: the study aims to assess the shear bond strength of modified-heliosit orthodontic adhesive with different concentrations of seashell and zirconium oxide nanoparticles. Materials and methods: Thirty-five sound-extracted human premolars were collected. Heliosit orthodontic adhesive was modified by (8%, 10%, and 12% seashell), and (1%, 3%, and 5% zirconium oxide) nanoparticles. Standard edgewise brackets were bonded to buccal enamel surfaces of the samples of control and six modified adhesive groups. At 24 h after bonding, shear bond strength was measured. Adhesive remnant index was scored under (10X) magnification power of stereomicroscope after de-bonding. The chemical characteristics of orthodontic adhesive material were explored before and after mixing with seashell and zirconium oxide nanoparticles by using FTIR. Results: Seashell groups (8, 10, and 12 %) containing hydroxyapatite nanoparticles had a higher shear bond strength mean value than the control group, (10%) seashell group had the highest mean value, while the least mean value was in (5% ZrO2) group with statistically significant differences between them. About adhesive remnant index, no significant differences were founded among the studying groups. Conclusion: the addition of (10%) seashell nanoparticles had the best performance and improved shear bond strength of heliosit orthodontic adhesive without violation the remnant of adhesive on the buccal enamel surface after brackets de-bonding.