The Use of Statically Determinate Force System in Closure of Anterior Open Bite in Adults.

Study Overview
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Brief Summary
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The aim of the current study was to evaluate and quantify the cephalometric changes produced by maxillary and mandibular extrusion arches in closure of anterior open bite in non-growing patients.

Official Title
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Dentoalveolar and Skeletal Changes Associated With a Statically Determinate Force System in the Closure of Anterior Open Bite in Adults: A Single-arm Clinical Trial

Conditions
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Anterior Openbite

Intervention / Treatment
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* Device: Extrusion arch


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Adult patients with anterior open bites more than 1 mm, permanent dentition except for the third molars which were extracted if erupted Exclusion Criteria: Frankfort to mandibular plane angle > 40 congenital craniofacial malformations or temporomandibular joint disorders, patients with severe gum show during smiling or increased incisal show at rest.

Ages Eligible for Study
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Minimum Age: 17 Years
Maximum Age: 30 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Extrusion arch<br>Hand made stainless steel extrusion arch wire (0.016x0.22) | Device: Extrusion arch<br>* one couple force system is applied; a custom-made extrusion wire from 0.016x0.022 stainless steel wire with helical bends placed 2-5 mm mesial to the molar tube placed in the upper and lower arches and tied distal to the lateral incisors<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| angular and vertical linear effects on incisors | Extrusion of upper and lower incisors measured from: incisal edge, centroid point and apex to the palatal and mandibular planes for the upper and lower incisors respectively. Angles between long axis of upper incisor to SN plane and palatal plane, Angle between long axis of lower incisor and mandibular plane using lateral cephalometric xray | up to 6 months | 
| angular and vertical linear effects on first molars | For the first molars: Angular measurements between the long axis of the measuring jigs and the palatal plane and mandibular plane for the upper and lower molars, respectively. Vertical measurements: perpendicular vertical distance from the measuring jigs to the palatal and mandibular planes for the upper and lower molars, respectively, using lateral cephalometric xray. | up to 6 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| change in the SN' to Mandibular plane angle | measuring the change in the angle between SN' to Mandibular plane angle, using lateral cephalometric xray | up to 6 months | 
| change in the palatal to Mandibular plane angle | measuring the change in the angle between the palatal to Mandibular plane angle, using lateral cephalometric xray | up to 6 months | 
| change in the Anterior facial height | measuring the change in the vertical distance between Nasion and Menton, using lateral cephalometric x-ray. | up to 6 months |