Bimaxillary Protrusion
Conditions
Keywords
T loops, Friction, Frictionless, power chains, digital models, anterior segment retraction
Brief summary
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.
Detailed 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.
Interventions
OTHERFriction Mechanics
anterior segment retraction using elastomeric power chains
anterior segment retraction using closing loops
Sponsors
Future University in Egypt
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
OTHER
Masking
SINGLE (Outcomes Assessor)
Masking description
Blinding of the principal investigator was not possible due to the nature of the interventions. However, the outcome assessor was blinded to the interventions and all digital models were unidentified during outcome assessment.
Eligibility
Sex/Gender
FEMALE
Age
13 Years to 25 Years
Healthy volunteers
Yes
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.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Rate of Anterior Segment Retraction | The start of anterior segment retraction up to complete space closure, an average of 6 months. | The rate of anterior segment retraction per month was measured on monthly digital models. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Anchorage Loss | The start of anterior segment retraction up to complete space closure, an average of 6 months. | Mesial movement of the first primary molar was evaluated on the digital models |
| Pain experienced after each activation of the two mechanics | The start of anterior segment retraction up to complete space closure, an average of 6 months. | Patients were asked to complete Visual Analogue Scales of the degree of pain after every intervention. The scale values between 0 to 10, with 0 being no pain experienced by the patient and 10 being the highest level of pain experienced. |
Countries
Egypt
Outcome results
None listed