None listed
Conditions
Brief summary
To date, there have been no comparative studies of retention methods post-expansion. This study aims to address this gap in the literature, comparing the effects of fixed and removable retention methods following rapid maxillary expansion; placement of a Hawley retainer and maintenance of a fixed expander appliance. Records obtained from prior to expansion, immediately posttreatment and then again at 12 month review will be analysed and interpreted in order to determine the best retention method.
Interventions
Participants will be randomly assigned to a retention appliance after the completion of their expansion treatment. Patients will be assigned one of the two types of retention modalities: use of either a Hawley retainer or maintenance of the expander appliance in situ.
During the expansion treatment, this phase is termed active treatment. After completion of the expansion, both groups will have the expander left in situ for 3 months. One group will then be switched to use of a removable Hawley r
Participants will be randomly assigned to a retention appliance after the completion of their expansion treatment. Patients will be assigned one of the two types of retention modalities: use of either a Hawley retainer or maintenance of the expander appliance in situ. During the expansion treatment, this phase is termed active treatment. After completion of the expansion, both groups will have the expander left in situ for 3 months. One group will then be switched to use of a removable Hawley retainer, and the other group will keep the expander in for an additional 6 months, with the final 3 months retainer free. The Hawley retainer will be in use for a total of 9 months and the overall study will take place over 12 months after the completion of the active expansion treatment phase. The Hawley retainer will be worn full time during the day and while sleeping. It should be only taken out for eating and cleaning. The retainer must be cleaned twice daily with a toothbrush and toothpaste. The Hawley retainer will be administered by the treating orthodontist. No strategies to monitor adherence will be used.
Sponsors
Zoe Thorning
Study design
Allocation
Randomised controlled trial
Primary purpose
Treatment
Eligibility
Sex/Gender
All
Age
6 Years to 13 Years
Healthy volunteers
No
Inclusion criteria
All participants will be selected based on the following criteria: 1. All participants must possess a mixed dentition, with both permanent and primary teeth present 2. All participants must have all permanent first molars and incisors erupted 3. All participants must be about to receive rapid expansion therapy using a Hyrax expander 4. All participants must only be receiving expansion treatment at this point in time 5. All participants must have no craniofacial abnormalities or syndromes
Exclusion criteria
1. Patient is not in the mixed dentition 2. Patient does not have all permanent first molars and incisors 3. Patient is going into another appliance during or immediately after treatment 4. Any craniofacial abnormalities.
Outcome results
None listed