For the study, Little’s Index3 and 3Shape Trios scans were used to perform an orthodontic analysis of where teeth were before and after treatment with a ProSomnus device for nine patients. Treatment times varied, with an average of 10 months and a range of 8 to 32 months. Scans were obtained from the before and after models and tooth position changes were as shown.
3Shape Trios Scan and Little’s Index Measurements
The digital overlays provided objective data. Across the nine subjects, the there were no visible or perceivable changes in tooth position. The global variation was less than +/- 0.75mm with a 95% Confidence level, P-values >0.1. This result was better than Norrhem’s2 rigid appliance measurements and the observations of Rose et al., Chen et al., and Pliska et al. who found changes of between −1 to −2 mm in the lower teeth during treatment4.
No statistically significant difference between Little’s Irregularity Index from the initial to the final models was observed. The precision milled, control-cured acrylic platform ProSomnus uses to design and manufacture their custom devices is superior to other cold-cured or flexible platforms in several ways. The denser material is less porous, easier to clean, stronger, and more precise; the close fit and stability likely is responsible for their retainer-like results. Like the fit and intended movement design for clear orthodontic aligners, the digital precision of the milled devices helps manage an unwanted side effect and may serve to allay a common perception of sleep physicians that tooth movement is inevitable.