Overbite (Excessive) Horizontal Clinical Trial
Official title:
Study the Effect of Upper Expansion Appliances on Lower Jaw Forward Projection/Growth
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.
Status | Not yet recruiting |
Enrollment | 60 |
Est. completion date | February 1, 2021 |
Est. primary completion date | February 1, 2020 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | All |
Age group | 9 Years to 11 Years |
Eligibility |
Inclusion Criteria: 1. Class II skeletal due to lower jaw backward projection 2. Class II malocclusion 3. Early mixed dentition (all first permanent molars erupted, as well as all erupting upper and lower permanent incisors) Exclusion Criteria: 1. Other orthodontic treatment provided 2. Growth problems (craniofacial syndromes, etc.) |
Country | Name | City | State |
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n/a |
Lead Sponsor | Collaborator |
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University of Alberta, Graduate Orthodontic Program |
Guest SS, McNamara JA Jr, Baccetti T, Franchi L. Improving Class II malocclusion as a side-effect of rapid maxillary expansion: a prospective clinical study. Am J Orthod Dentofacial Orthop. 2010 Nov;138(5):582-91. doi: 10.1016/j.ajodo.2008.12.026. — View Citation
McNamara JA Jr, Sigler LM, Franchi L, Guest SS, Baccetti T. Changes in occlusal relationships in mixed dentition patients treated with rapid maxillary expansion. A prospective clinical study. Angle Orthod. 2010 Mar;80(2):230-8. doi: 10.2319/040309-192.1. — View Citation
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Lower jaw size | Lower jaw size will be evaluated by computed tomography. | 9 months | |
Primary | Lower jaw projection | Lower jaw projection will be evaluated by computed tomography. | 9 months | |
Secondary | Jaw joint size | Jaw joint size will be evaluated by CBCT | 9 months | |
Secondary | Base of skull bone size | Base of skull bone size will be evaluated by CBCT | 9 months | |
Secondary | Base of skull bone position | Base of skull bone positions will be evaluated by CBCT | 9 months | |
Secondary | Jaw joint position | Jaw joint will be evaluated by CBCT | 9 months |