Measurements
treatment/start of retention
SECONDARY
Digitalized three-dimensional (3D) study casts were produced for measurements of the three retention groups before treatment (T0), at the end of active treatment/start of retention (T1), after the 2-year retention period (T2) and 1 year after the post-retention period (T3). Before the assessment of measurements, the study casts were digitized with a stationary 3D scanner (D3, 3Shape, Copenhagen, Denmark). The measurement points were located on the digital models using OnyxCeph(A) Primary and secondary outcome measures in OnyxCeph