Method: Ten brackets of three commercial brands were selected for this study: GAC reference 31.21.200 and 31.23.210 - GAC International, Dentsply, Nova York, EUA; Forestadent reference 0740-0151 and 0740-0351 - G&M Orthodontics, Forestadent, Pforzheim, Germany; and Morelli reference 10.10.401 and 10.10.405 - MORELLI Ortodontia, Sorocaba, São Paulo, Brasil. Sixty identical artificial teeth were selected for measurements, thirty left central incisors and thirty left canine. (MOM reference 2025 – Manequins Odontológicos Marília, Marília, São Paulo, Brasil.) Two individual metal matrix for each teeth group were made. For both individual matrix, a base matrix, which allowed reference guides through the inclusion of individual matrix in the same position and orientation for bonding brackets was confectioned. The capture images were made from standardized photography ortho-radial through digital camera (Nikon D40, AF Micro Nikkor 105 mm 1:2:8 D lens, Macro SpeedLight SB-29 Flash, Nikon, Tokyo, Japão), exported and measured with the software Image J. For each figure, five measurements were made. ANOVA and Tukey statistic tests were performed.
Result: The results showed statistically significant differences between the brackets of the left maxillary central incisors between Morelli and GAC, and between Forestadent and GAC at 5% of significance level. The data of left upper canines were statistically significant between Morelli and GAC, and between Morelli and Forestadent at 5% of significance level.
Conclusion: At study conditions, despite the same bracket prescription among different brands, the angulations are not equivalent.