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

Status

UNKNOWN

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT03579745

Enrollment

Registered

2018-07-09

Start date

2018-10-31

Completion date

2020-06-30

Last updated

2018-07-09

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Bimaxillary Proclination

Keywords

lingual orthodontics, Lever arm, En masse retraction

Brief summary

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

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.

Interventions

PROCEDURELingual orthodontics

A coil spring will be attached from the lever arm to the first molar tube

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

TREATMENT

Masking

SINGLE (Outcomes Assessor)

Eligibility

Sex/Gender

ALL

Age

18 Years to 30 Years

Healthy volunteers

Yes

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.

Design outcomes

Primary

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

Secondary

Measure	Time frame	Description
Torque control	12 months	U1 - Palatal plane angle

Contacts

Primary ContactAhmed Kandil Al Asfar, Masters

Kandilahmed04@gmail.com01008087762

Backup ContactSherif Kordy, PhD

sherif-kordi@hotmail.com01224015821

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026