Quantitative-Comparative Analysis of the Microscopic Changes of the Use of Sandblasting with 50 μm and 110 μm Aluminum Oxide Particles at the Base of the Brackets

The objective of this study was to compare the microscopic changes in the base of the brackets after sandblasting with 50 μm and 110 μm aluminum oxide particles (Al2O3). Methods: The sample of this study will be made up of 60 premolar teeth that were extracted for orthodontic purposes; metal premolar brackets (Roth 0.022) were used in the brand GC Orthodontics Axcess. 2 groups of 30 brackets were divided and adhered to the vestibular surface of the teeth of the entire sample, the adhesion was photopolymerized using an LED lamp for 10 seconds in each bracket. The first group was sandblasted with 50-micron aluminum oxide. The first shear was then performed, and the second shear was performed after one week. The other group of brackets was sandblasted with 110 μm aluminum oxide. Data were analyzed using descriptive statistics, ANOVA, and tests. The mesh of the brackets was evaluated with the adhesive residue index using a stereoscopic microscope with 10X magnification.