An interventional study of Upper arch Wilson quadhelex appliance in Overbite (Excessive) Horizontal, sponsored by University of Alberta. Recruiting at 1 site in Canada. Open to participants aged 9 Years to 11 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-01-07.
Sponsored by University of Alberta · Not applicable, Interventional, and Treatment
Young children with backward positioned lower jaw/chin will be recruited to have an upper jaw expansion appliance. Previous research showed that the use of similar appliances can lead to lower jaw forward growth. 60 young children aged 9-11 will be recruited to have either active or non-active Wilson type upper arch expansion appliance. Patients will have special x-ray (Cone Beam computed tomography) before and after treatment (after 9 months) of starting the treatment. After participation, routine orthodontic treatment will be continued.
Previous research showed that the use of upper jaw expansion appliances can lead to lower jaw forward growth (1). 60 young children aged 9-11 with backward positioned lower jaw/chin will be recruited to have either active or non-active Wilson type upper arch expansion appliance. Patients will have special x-ray (Cone Beam computed tomography) before and after treatment (after 9 months) of starting the treatment. After participation, routine orthodontic treatment will be continued.
University of Alberta is the lead sponsor of 823 studies on the registry; 169 are open to participants now.
Of its 5 completed or terminated interventional studies of FDA-regulated products, 3 (60%) have results posted.
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Exclusion Criteria:
Active upper arch Wilson quadhelex appliance
Device: Upper arch Wilson quadhelex appliance
Non-Active upper arch Wilson quadhelex appliance
Device: Upper arch Wilson quadhelex appliance
Upper arch Wilson quadhelex appliance
Lower jaw size
Lower jaw size will be evaluated by computed tomography.
Time frame: 9 months
Lower jaw projection
Lower jaw projection will be evaluated by computed tomography.
Time frame: 9 months
Jaw joint size
Jaw joint size will be evaluated by CBCT
Time frame: 9 months
Base of skull bone size
Base of skull bone size will be evaluated by CBCT
Time frame: 9 months
Base of skull bone position
Base of skull bone positions will be evaluated by CBCT
Time frame: 9 months
Jaw joint position
Jaw joint will be evaluated by CBCT
Time frame: 9 months
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Overbite