| Summary: | The purpose of this study is to assess the variations induced by Clear Aligner Treatment (CAT) on the periodontal status and microbiological composition of oral microbiota. A total of 20 orthodontic patients were submitted to professional oral hygiene and, subsequently, underwent CAT (Group one, trials). A total of 20 non orthodontic patients (Group two, controls) remained untreated after oral hygiene. At T<sub>0</sub> (baseline) and T<sub>1</sub> (after 2 months), the participants were clinically examined for Probing Pocket Depth (PPD), Bleeding on Probing (BOP) and Plaque Index (PI), and microbiological tests were performed to detect bacteria of the red and orange complexes as well as the presence of <i>Aggregatibacter actinomycetemcomitans</i>. No significant inter- or intra-group differences were shown neither for PPD, PI and BOP (<i>p</i> > 0.05), nor for bacteria expressed in copies/microlitre or in percentages (<i>p</i> > 0.05). The only significant difference was assessed from T<sub>0</sub> (baseline) to T<sub>1</sub> (2 months) in both groups and is related to the total bacteria count increase. However, this parameter encompasses all the bacteria of the common oral microbiota, thus, not representing a significant result from a clinical point of view. Despite the limitations of this study, CAT does not significantly affect periodontal and microbiological parameters with respect to untreated patients for the first two months of therapy.
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