20 Chapter 2 study was registered in the trial register as NL9031. The study was conducted in accordance with the 2008 revised requirements of the Helsinki Declaration of 1975 and the CONSORT Guidelines. Using sealed envelope randomisation, the participants were randomly assigned to receive either the maxillary 4-IOD with solitary attachments (n = 25), or the maxillary 4-IOD with bar attachments (n = 25) (Fig. 2.1). The treatment procedures will be described in brief; a full description of all the procedures can be found in the previously reported 1-year results8. Figure 2.1 | CONSORT flow diagram.
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