This randomized controlled trial intends to test the efficacy of two treatment protocols in the correction of Class III malocclusion with maxillary constriction. We have to options, either to modify the growth using inter-maxillary traction based on an upper fixed appliance that is used in the same time for rapid maxillary expansion or to inhibit mandibular growth by a removable mandibular retractor (RMR) supplied with an expansion screw.
Age range
12 Years – 15 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
Change in the SNA angle
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the SNB angle
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the ANB angle
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the SN-GoMe angle
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the MM angle
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the SN-SPP angle
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the Witz appraisal
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the Co.Go.Me angle
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the mandibular length
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the ramus height
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the lower facial height
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the A-H variable
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the B-H variable
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the SN-U1
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the GoMe-L1 angle
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the SPP-U1 angle
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in ls-E Line distance
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in li-E Line distance
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the Gla-Sn-Pog angle
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the naso-labial angle
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the labio-mental angle
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the Ag to MZF-j variable
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the J-J distance
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the molar width at the level of apices (M-MRA)
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the molar width at the level of cusps (M-MCT)
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months
Change in the inferred molar tipping (M-tip)
Timeframe: At two assessment times: (1) one day before the beginning of the treatment, and (2) at the end of the retention phase which is expected to occur within 12 months