Participants
airway infections, inborn facial syndrome, orthodontic, overjet
ANGLE CLASS I, OBSTRUCTIVE SLEEP APNOEA
Three public health care clinics from Northern Finland took part in this study. Two hundred and seventy 7-year-old children from birth cohorts were screened for the trial. The children were examined by general dentists and their eligibility for this study was considered by orthodontists in their local health care centres.The inclusion criteria for this study were Angle Class II molar relationships, overjet over 6 mm, and deep bite. Exclusion criteria were inborn facial syndrome, facial asymmetry, the angle between palatal and mandibular line (PL-ML) over 35 degrees, earlier orthodontic treatment, obstructive sleep apnoea, and continuous airway infections.
Flow chart of the participants in the trial (F: female; M: male). Dental casts at Blinding was not possible for clinicians, patients, or their parents. All the participants were coded (J.J.), so patients, groups, or gender could not be identified when examining the data.