Comparison between two screws for maxillary expansion: a multicenter randomized controlled trial on patient's reported outcome measures.

European Journal of Orthodontics
Michele NieriLorenzo Franchi

Abstract

The objective of this study was to compare an expansion screw of the maxilla that generates moderate and continuous forces versus a conventional screw for rapid maxillary expansion (RME) on patient-reported outcome measure during the first 12 weeks of treatment. This is a superiority, multicenter, two-arm parallel balanced randomization trial. Patients in the mixed dentition were included with a transverse discrepancy between the two arches of at least 3 mm. An expansion screw using moderate continuous forces (Leaf group, treated with an expansion screw with Ni-Ti springs) was compared to a conventional RME screw that generates intermittent heavy forces (RME group). The primary response variable was the visual analogue scale (VAS) on pain calculated in the first 12 weeks of therapy. The VAS on difficulty on speaking and oral hygiene, patient satisfaction, and complications were also evaluated. A computer-generated block randomization was used with allocation concealed in sequentially numbered opaque-sealed envelopes. Blinding was not applicable. Linear models were used for statistical analysis. Twenty-eight patients in the Leaf group and 28 patients in the RME group were randomized and included in the study. There were no dropo...Continue Reading

References

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