Effects of Invisalign Palatal Expander vs Rapid Palatal Expander With Facemask in Growing Class III Patients
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Invisalign Palatal Expander (IPE), Rapid Palatal Expander (RPE).
- Who it may be relevant to
- Registry conditions: Skeletal Class III Malocclusion, Transverse Maxillary Deficiency. Basic parameters: 8 years — 12 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Thailand
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Official title
Effects of the Invisalign® Palatal Expander (IPE) vs. Rapid Palatal Expander With Facemask in Growing Skeletal Class III Patients: A CBCT Randomized Clinical Trial
Overview
The goal of this clinical trial is to compare two types of palatal expanders used with a facemask in children who have skeletal Class III and a narrow upper jaw. The study will compare the Invisalign Palatal Expander (IPE) and the Rapid Palatal Expander (RPE). Researchers want to learn how these devices affect jaw bones and tooth position. They also want to learn about children's and parents' experiences during treatment. The main questions this study aims to answer are: Do IPE and RPE widen the upper jaw differently? Do they cause different changes in tooth position? How do children and parents describe their treatment experience? Participants will be children aged 8 to 12 years who have skeletal Class III and a narrow upper jaw. Children with craniofacial conditions, previous upper jaw expansion, or medical conditions that prevent orthodontic treatment will not take part. Parents and children must give consent before joining the study. Participants will: Be assigned to receive either IPE or RPE Expand the upper jaw to 7 mm (0.25 mm per day) After expansion, wear a facemask for at least 12 hours per day for 6 to 8 months Have cone-beam computed tomography (CBCT) scans taken before expansion, after expansion, and after facemask treatment Take part in an interview with a parent after expansion Researchers will use CBCT images to measure changes in jaw bones and tooth position. The main outcomes are changes in jaw bones and tooth position. Secondary outcomes include children's and parents' experiences during treatment.
Interventions
- Device Invisalign Palatal Expander (IPE)
Participants will be treated with an Invisalign palatal expander. Participants will be instructed to wear the appliance full-time, except when brushing and flossing their teeth, and to change the device daily (0.25 mm) until the planned transverse width (7 mm.) is achieved. - Device Rapid Palatal Expander (RPE)
Participants will be treated with a bonded RPE. Their parents are instructed to activate the screw once per day (0.25 mm) until the expansion screw reaches 7 mm.
Primary outcome measures
- Maxillary skeletal change [Time frame: T0: Baseline (Day 0) - before initiation of maxillary expansion T1: Post-expansion - after completion of 7 mm expansion with RPE or IPE T2: Post-protraction - after 6 months of active maxillary protraction]
- Maxillary dental change [Time frame: T0: Baseline (Day 0) - before initiation of maxillary expansion T1: Post-expansion - after completion of 7 mm expansion with RPE or IPE T2: Post-protraction - after 6 months of active maxillary protraction]
Secondary outcome measures (1)
- Functional and perceptual experiences and parental involvement associated with the use of Rapid Palatal Expander (RPE) and Invisalign Palatal Expander (IPE). [Time frame: Single assessment at 28 days (± 5 days) after appliance insertion]
Eligibility criteria
Inclusion criteria
- Patients aged between 8 and 12 years
- Patients in the mixed dentition or early permanent stage have at least three stable teeth per quadrant, good oral hygiene, and healthy periodontal tissues
- Patients with maxilla-mandibular discrepancies; skeletal class III is indicated by an ANB angle < 0 degrees or a Wits appraisal value that is negative, and Maxillary constriction is characterized by posterior crossbite teeth or having a maxillary width below the norm value.
Exclusion criteria
- Patients with craniofacial anomalies such as cleft lip and palate
- Patient with a prior history of maxillary expansion.
- Patients who have systemic conditions that contraindicate orthodontic treatment.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Allocation
- Randomized
- Model
- Parallel assignment
- Masking
- Single blind
- Primary purpose
- Treatment
Study locations
Thailand · 1 center
- Faculty of Dentistry, Mahidol University — Bangkok
Publications
- Weissheimer A, de Menezes LM, Mezomo M, Dias DM, de Lima EM, Rizzatto SM. Immediate effects of rapid maxillary expansion with Haas-type and hyrax-type expanders: a randomized clinical trial. Am J Orthod Dentofacial Orthop. 2011 Sep;140(3):366-76. doi: 10.1016/j.ajodo.2010.07.025. PMID 21889081
Identifiers
NCT: NCT07485478 · MU-DT/PY-IRB 2025/095.2312