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The use of orthodontic appliances can contribute to a greater accumulation of dental biofilms, by providing new retentive areas, leading to the appearance of white spots adjacent to the brackets. Several models of brackets have been developed with the aim of minimizing microbial accumulation, such as self-ligating brackets, as they do not require elastomeric ligatures. Scardovia wiggsiae was recently described as a bacterium associated with early childhood caries and white spots. The objectives of the present study were to detect and compare the presence of Scardovia wiggsiae in biofilms collected adjacent to self-ligating and conventional metal brackets in volunteers using the device for more than 6 months. Twenty-six volunteers were included, 10 with conventional metal brackets and 16 with self-ligating brackets. The patients were examined orally for the detection of white spots and then biofilm samples were collected from tooth 41. This material was sent for DNA extraction and then submitted to real-time PCR with specific primers for S. wiggsiae. S. wiggisiae was detected in 26.9% of the samples, 35.7% of which had white spots. There were no statistically significant differences between the detection of bacteria and the type of bracket or regarding white spot detection (p>0.05). White spots were more frequently detected in patients with self-ligation (p<0.05). In conclusion, S. wiggisiae was found in a minority of the samples, not being associated with the presence of stains or the type of bracket.
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