Evaluation of the Rate of Anterior Segment Retraction Using Two Types of Mechanics

Future University in Egypt

Status: Completed

Conditions: Bimaxillary Protrusion

Treatments: Other: Friction Mechanics; Other: Frictionless Mechanics

Study type: Interventional

Funder types: Other

Identifiers

NCT04892056

FUE.REC 9/10-2018

Details and patient eligibility

About

The rate of anterior segment retraction in bi-maxillary protrusion cases was evaluated comparing the friction and friction-less mechanics. since, there has been a lack of clear cut guidelines for clinicians for the optimum method for retraction, this randomized clinical trial was done.

Full description

Thirty bi-maxillary protrusion female patients were randomly allocated into either intervention groups. In the Friction group, retraction was accomplished using elastomeric power chains extending from crimpable hooks distal to the lateral incisors, on 0.017x0.025-inch Stainless Steel wires, to the mini-screws . While in the friction-less group with retraction done using T- loop springs made of 0.017x0.025-inch titanium molybdenum wires. Retraction force was set to 160g per side in both intervention groups. Activation was done every four weeks. Rate of anterior segment retraction was evaluated via digital models.

Enrollment: 30 patients

Sex: Female

Ages: 13 to 25 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Female Subjects.
• Age 13-25 y of age.
• Skeletal Angle Class I malocclusion with Bimaxillary dentoalveolar protrusion in need of four 1st premolar extractions with maximum anchorage.
• Fully erupted permanent dentition without crowding.
• Good oral and general health.

Exclusion criteria

• Systemic Diseases or syndromes or on anti-inflammatory medication.
• Extracted or missing permanent teeth.
• History of previous Orthodontic Treatment.
• Parafunctional Habits.
• Badly decayed teeth.

Trial design

Primary purpose: Other

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

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30 participants in 2 patient groups

Anterior Segment Retraction using Friction mechanics by elastomeric power chains

Experimental group

Description:

Elastomeric power chains extending from 8mm crimpable hooks, distal to the lateral incisors, on 0.017"x0.025" Stainless Steel WIres, to the mini-screws. The power chains delivered 160g of force per side.

Treatment:

Other: Friction Mechanics

Anterior Segment Retraction using Frictionless mechanics by T-loops

Experimental group

Description:

T shaped closing loops were fabricated on 0.017"x0.025" Titanium- Molybdenum wires (TMA) were used to deliver 160g of force per side by 4mm distal activations.

Treatment:

Other: Frictionless Mechanics