An interventional study of Mandibular Setback with maxillary impaction and Mandibular setback only in Orthodontic Appliance, sponsored by Jordan University of Science and Technology. Completed at 1 site in Jordan. Open to participants aged 18 Years to 30 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2020-05-06.
Sponsored by Jordan University of Science and Technology · Not applicable, Interventional, and Treatment
The aim of this study was to record the OBF changes after surgical correction of mandibular prognathism in patients with or without increased vertical skeletal dimensions at different time intervals (T0: before surgery; T1: at debond; T2: 3 months post-retention).
Forty-two patients who presented to orthodontic clinics with severe Class III skeletal malocclusion and were already into orthodontic preparation for orthognathic surgery were selected to participate in thestudy.
Patients were allocated into one of 2 groups as follows: - Group 1: - Class III patients with increased vertical relationship Included 22 patients (8 males, 14 females).These patients were scheduled for bimaxillary surgical procedures (Maxillary advancement and mandibular setback with posterior maxillary impaction) to correct the antero-posterior and vertical skeletal discrepancies.
Group 2: - Class III subjects with normal vertical relationship Included 20 patients (8 males, 12 females).These patients were scheduled for mandibular setback surgical procedure (with no posterior maxillary impaction) to correct the antero-posterior skeletal discrepancy.
Diagnostic records (orthopantomogram, lateral cephalogram, study casts, clinical photographs) were taken for all subjects before surgery. The same records were taken post surgery just before fixed orthodontic appliance debond.
The included patients were treated by orthodontic teaching staff and postgraduate residents at orthodontic clinics/JUST using pre-adjusted edgewise fixed appliance (3M Gemini Uniteks, 0.022" MBT prescription brackets).
Bite force was measured bilaterally in the first molar region using a portable occlusal force gauge (GM10, Nagano Keiki, Tokyo, Japan), that consisted of a hydraulic pressure gauge and a biting element made of a vinyl material encased in a polyethylene tube. 3 OBF measurements were recorded on each side and incisally with a 15 second rest between each bite, the average of the three readings was used. Three OBF measurements were considered in the analysis: the maximum OBF (MOBF) achieved by the subject, the averaged OBF on molars (AOBF), and the OBF at the incisal region (IOBF).
Number of teeth in contact was measured using double-sided articulation paper strips that was smeared with a thin layer of petroleum jelly prior to its' use so as to improve the visualization of the markings of the contact points that existed in a subject's intercuspal position.
57 studies on the registry are indexed under Malocclusion, Angle Class III; 11 are open to participants now.
This study's enrollment of 40 is above the median of 32 across 53 interventional studies indexed under Malocclusion, Angle Class III.
Browse Malocclusion, Angle Class III studies →Jordan University of Science and Technology is the lead sponsor of 89 studies on the registry; 7 are open to participants now.
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Exclusion Criteria:
Group 1: - Class III patients with increased vertical relationship These patients were scheduled for bimaxillary surgical procedures (Maxillary advancement and mandibular setback with posterior maxillary impaction) to correct the antero-posterior and vertical skeletal discrepancies.
Procedure: Mandibular Setback with maxillary impaction
Group 2: - Class III subjects with normal vertical relationship These patients were scheduled for mandibular setback surgical procedure (with no posterior maxillary impaction) to correct the antero-posterior skeletal discrepancy.
Procedure: Mandibular setback only
Occlusal bite force will be measured after surgery to correct vertical disproportions
Occlusal bite force will be measured after surgery without changing vertical disproportions.
Occlusal bite force
measured bilaterally in the first molar region using a portable occlusal force gauge
Time frame: 1 year
Number of teeth in contact
measured using double-sided articulation paper strips that was smeared with a thin layer of petroleum jelly
Time frame: 1 year
Plan to share: No
No publications or documents are linked to this record.
This study is completed, as verified in May 2020. You cannot join it, but the record below documents what was studied.
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Malocclusion, Angle Class III →
Jordan University of Science and Technology