Objective: Investigate the marginal ridges leveling accuracy of Alexander and Viazis bracket placement methods. Methods: Eighty pairs of dental casts were selected, with complete permanent dentition, without occlusal wear or?restorations. A linking line between mesial and distal ridges of posterior teeth was done to measure the occlusal?thirds with digital caliper. The means, obtained from 3 different examiners, were compared with the values of?Alexander and Viazis’ equations through One-way ANOVA with α=0.05. Results: The second premolar placement value (x) suggested by the authors showed no difference in comparison?to the occlusal third size of the sample teeth (p0.05), however for the first premolars, a significant difference?was found (p0.001). The value adopted for positioning on the first permanent molars (x-0.5mm) is consistent?with the size of the occlusal third of these teeth (p=0.0531). A significant difference was also found for the?second permanent molars bracket positioning between the predefined value (x-1mm) and the sample (p0.001). Conclusions: The vertical positioning values proposed by Alexander and Viazis for placement of second?premolars and first permanent molars do contribute to the leveling of marginal ridges, which cannot be applied?for the values recommended for the first premolars and second permanent molars.
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