Effect of Archwire Gauge on the Rate of Canine Retraction

Study Overview
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Brief Summary
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trial will be done to evaluate the effect of archwire gauge on the rate of canine retraction, canine tip and torque, root resorption and loss of anchorage in maxillary dental protrusion cases requiring first premolars extraction.

Detailed Description
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Three working archwires of different gauges will be used during canine retraction; st.st 0.019×0.025 as a comparator, st.st 0.016×0.022 and st.st 0.017×0.025 wires as interventions. after levelling and alignment till reaching the working archwire, it will be left in place for a month then maxillary first premolars will be extracted and base line records will be taken(digital models, digital periapical radiographs and panorama). digital models will be taken monthly to measure rate of canine retraction for 6 months. after 6 month evaluation of anchorage loss, change in canine tip and torque will be done on last obtained digital model , panorama will be taken to evaluate the change in canine tip and digital periapical radiograph will be taken and compared with the preretraction radiograph to evaluate amount of root resorption.

Official Title
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Effect of Archwire Gauge on the Rate of Canine Retraction in Adults: A Randomized Clinical Trial

Conditions
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Canine Retraction

Intervention / Treatment
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* Other: st.st 0.019×0.025 wire
* Other: st.st 0.016×0.022 wire
* Other: st.st 0.017×0.025 wire


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Adult females (age range 18-28 years old). Maxillary dental protrusion indicating first premolars extraction. Full permanent dentition (not necessitating third molars). Exclusion Criteria: Patients having systemic diseases or on medications that would affect tooth movement. Active periodontal disease or obvious bone resorption in maxillary arch. Patients with habits that are detrimental to dental occlusion (thumb sucking, tongue thrusting … etc.). Previous orthodontic treatment. Missing teeth.

Ages Eligible for Study
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Minimum Age: 16 Years
Maximum Age: 26 Years

Sexes Eligible for Study
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Female

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
Interventional Model Description: Three groups of patients each receives different wire gauge during canine retraction phase during space closure.
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: st.st 0.019×0.025 wire<br> | Other: st.st 0.019×0.025 wire<br>* rectangular stainless steel wire that will be used during canine retraction after first premolars extraction<br>|
| Experimental: st.st 0.016×0.022 wire<br> | Other: st.st 0.016×0.022 wire<br>* rectangular stainless steel wire that will be used during canine retraction after first premolars extraction<br>|
| Experimental: st.st 0.017×0.025 wire<br> | Other: st.st 0.017×0.025 wire<br>* rectangular stainless steel wire that will be used during canine retraction after first premolars extraction<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| rate of canine retraction | the distance that canine moved every month | 6 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| change in canine tip | change in canine crown tipping to certain reference plane with the aid of cone beam computed tomography | 6 months | 
| change in canine torque | change in canine crown and root torque to certain reference plane with the aid of cone beam computed tomography | 6 months | 
| loss of molar anchorage | assess from digital models if there is change in mesio-distal position of maxillary first molar | 6 months | 
| amount of canine root resorption | assess amount of root resorption (if occurred) with the aid of cone beam computed tomography | 6 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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canine retraction, archwire gauge