Introduction and Objective: Although it is important for orthodontists to know the accuracy of information contained in the pre-adjusted slot brackets for control and precision of tooth movement, manufacturers do not provide the margin of error built in the different values in these brackets. The objective of this study was to compare the torque and angle means of brackets of four different commercial brands with the original MBT prescription. Materials and Methods: A sample of 55 brackets of each brand was taken: 3M® Unitek, Monrovia, Calif. : line Gemini M. B. T - Dentaurum® Pforzheim, Germany: line Equilibrium 2 M. B. T - Aditek® Grabilnhos, Sao Paulo Brazil: line Vector M. B. T - Morelli® Perdizes Sao Paulo, SP: line M. B. T system, for a total of 220 brackets. The established range of tolerance was nominal value ±0.5 to the torque and ±0.2° to the angle. Bracket measurement was done with a Prazis ® 50X optical comparator. Results: Torque average values for the brand marks Morelli and Aditek were distant from the nominal value; 3M Unitek values were found within the range with no statistically significant differences. All four brands showed statistically significant differences between torque average values (test ANOVA (p<0,05)). With regards to angulations averages all were outside the range of tolerance except for Morelli (p=0,11). 3M, UNITEK® and DENTAURUM® brackets showed no statistically significant differences between angle average values (ANOVA (p=0,985)). Conclusions: A large variability for both the torque and angulations values for all four brands. This variability was less for Equilibrium 2 MBT (Dentaurum) and Gemini MBT (3MUnitek) brackets. Key Words: Torque, Angle, Orthodontic brackets, Quality