Canine Retraction Using Power Arms and Temporary Anchorage Devices
Trial Snapshot
- Phase
- Not Applicable
- Status
- Completed
- Sponsor
- Future University in Egypt
- Enrollment
- 10
- Locations
- 1
- Primary Endpoint
- Canine retraction
Study Overview
Brief Summary
Various malocclusions require the extraction of the first premolars and retraction of the canines with the need for maximum anchorage. If the canines are pulled into the extraction space using the molar teeth for support, unwanted tooth movement occurs. This study aims to evaluate the effect of temporary anchorage devices and power arms, which are auxiliary orthodontic appliances in reducing undesirable tooth movements.
Detailed Description
In orthodontic patients who require overjet correction, increased facial convexity, or relief of severe crowding, dental extraction followed by canine retraction is indicated. In conventional orthodontic treatment, the molars are used for anchorage and reinforced with intra-oral or extra-oral appliances. Although effective, this produces unwanted side effects where the molars move mesially and rotate, taking up some of the extraction space. As the canines move into the extraction space they tip backward requiring further uprighting. Power arms are vertical metal extensions placed in the canine brackets. They direct the force to the center of resistance of the tooth to allow bodily movement and prevent canine tipping. Temporary anchorage devices (TADs) are minimally invasive, small screws, inserted in the jaw bones to act as anchorage units instead of the molars.
This study aims to evaluate the effect of the TADs and power arms on the efficiency of canine retraction including the rate of canine retraction and canine tipping as well as mesial molar drift and rotation.
The null hypothesis is that the use of the power arm and the TADs have no effect on the canine retraction rate.
This study is a single-arm, single-center study. Twenty quadrants in 10 adult patients will be selected from the Orthodontic Outpatient Clinic at the Future University in Egypt.
Orthodontic records will be collected including study models, intra- and extra-oral photographs and cone beam computed tomograms.
Study Design
- Study Type
- Interventional
- Allocation
- Na
- Intervention Model
- Single Group
- Primary Purpose
- Treatment
- Masking
- None
Eligibility Criteria
- Ages
- 18 Years to 25 Years (Adult)
- Sex
- All
- Accepts Healthy Volunteers
- No
Inclusion Criteria
- •Adult orthodontic patient
- •Any malocclusion requiring the extraction of the first premolar and canine retraction
- •Full permanent dentition with the exception of the wisdom teeth.
Exclusion Criteria
- •Any missing permanent tooth
- •Previous orthodontic treatment
- •Periodontal disease; pregnancy
- •Systemic disease or medication that affects bone metabolism
Arms & Interventions
Canine retraction
The canines will be retracted by extending short silver elastomeric chains between the power arms in the canine brackets and the TADs. The applied force will be checked and adjusted to 150 g.
Intervention: canine retraction (Procedure)
Outcomes
Primary Outcomes
Canine retraction
Time Frame: Baseline to 6 months
Amount of canine movement in millimeters measured on digital models. . The change in the vertical distance from the canine cusp tip to a line connecting the medial points of the third palatal rugae
Molar mesial drift
Time Frame: Baseline to 6 months
Amount of molar movement in millimeters measured on digital models. The change in the vertical distance from the mesiobuccal cusp tip to a line connecting the medial points of the third palatal rugae
Secondary Outcomes
- Canine tipping(Baseline to 6 months)
- molar rotation(Baseline to 6 months)
Investigators
Yehya Mostafa
Head of the Orthodontic Department
Future University in Egypt