Evaluation of Profile Changes and Torque Control in Dental Bimaxillary Proclination Cases Using Lingual Lever Arm Mechanics vs Conventional Lingual Orthodontic Mechanics A Randomized Controlled Trial

Study Overview
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Brief Summary
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This study evaluates the profile changes and torque control using lingual lever arm vs conventional lingual mechanics. Half of the patients will receive lever arms and the other half will receive conventional lingual orthodontics.

Detailed Description
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Conventional lingual orthodontic biomechanics leads to torque loss during en masse retraction of the anterior segment in the bimaxillary proclination cases treated by first premolar extraction. Torque loss affects the final outcome of the treatment negatively. Adding a lever arm to the lingual wire will transmit the point of force application at or apical to the center of rotation which will reduce or eliminate toqrue loss during anterior segment retraction.

Official Title
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Evaluation of Profile Changes and Torque Control in Dental Bimaxillary Proclination Cases Using Lingual Lever Arm Mechanics vs Conventional Lingual Orthodontic Mechanics A Randomized Controlled Trial

Conditions
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Bimaxillary Proclination

Intervention / Treatment
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* Procedure: Lingual orthodontics


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Male or female adult patients with age range 18-30 yrs old. Class I bimaxillary dentoalveolar proclination. Full permanent dentition. Good oral hygiene. Maximum anchorage is required. Healthy bone around the first molars is needed. Exclusion Criteria: .Systemic disease. Severe crowding. Extracted or missing upper permanent tooth/teeth (except for third molars). Signs, symptoms or previous history of temporomandibular disorders (TMD). Previous orthodontic treatment.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 30 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Conventional lingual mechanics<br> | Procedure: Lingual orthodontics<br>* A coil spring will be attached from the lever arm to the first molar tube<br>* Other names: Conventional lingual mechanics;|
| Experimental: Lever arm lingual mechanics<br> | Procedure: Lingual orthodontics<br>* A coil spring will be attached from the lever arm to the first molar tube<br>* Other names: Conventional lingual mechanics;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Nasolabial angle | Soft tissue lateral cephalometric radiograph measurement | 12 months | 
| Profile convexity reduction | N'-sn -Pog' soft tissue angle | 12 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Torque control | U1 - Palatal plane angle | 12 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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lingual orthodontics, Lever arm, En masse retraction