Orthodontic Appliance Clinical Trial
Official title:
A Comparative Assessment of Occlusal Bite Force Changes After Surgical Correction of the Increased Vertical Dimension in Mandibular Prognathism Subjects: A Prospective Clinical Trial
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.
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