Efficiency of Canine Retraction Using Different Reactivation Intervals

Future University in Egypt

Status: Unknown

Conditions: Class III Malocclusion; Bimaxillary Protrusion; Class II Division 1 Malocclusion; Crowding, Tooth

Treatments: Procedure: Canine retraction

Study type: Interventional

Funder types: Other

Identifiers

NCT04905004

20153110-8-14-2017

Details and patient eligibility

About

Canine retraction after 1st premolar extracion into the extraction space is a routine treatment in orthodontics. Orthodontic patients requiring first premolar extraction, canine retraction and maximum anchorage were recruited for this randomized controlled trial. A search of the literature did not indicate the ideal frequency of elastomeric chain reactivation for optimum canine retraction. The study was approved by the ethical committee. The first premolars were extracted. Elastomeric chains were used to retract the canine distally into the 1st premolar space. The optimum reactivation interval was evaluated regarding the efficiency of treatment in terms of rate of canine retraction, canine tipping and rotation, root resorption and pain at the intervals of 2, 4, 6 and 8 weeks. Three dimensional imaging, as well as digital scanning were the methods for data collection.

Full description

The canines, 2nd premolars, 1st molars and 2nd molars were bonded and banded. Leveling and alignment was achieved. After the first premolar extraction, temporary anchorage devices were inserted interradicular between 2nd premolar and 1st molar. Canine retraction was performed on a 0.016" X 0.022" stainless steel arch wire. A power arm was extended to apply the force closer to the center of resistance and achieve bodily movement. Elastomeric chains were calibrated to deliver a force of 150g and extended from the power arm to the mini screws directly. Recruited patients were randomly allocated to four groups according to the duration between the elastomeric chain reactivation. Canine reactivation intervals were 2, 4, 6, or 8 weeks. Cone beam computed tomography was performed before canine retraction and after 6 months of retraction. Digital dental casts were taken before canine retraction and monthly for 6 months.

Enrollment: 56 estimated patients

Sex: All

Ages: 13 to 30 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Patients requiring 1st premolar extraction (e.g bimaxillary dentoalveolar protrusion)
• Erupted full set of permanent teeth (excluding 3rd molars)

Exclusion criteria

• Systemic diseases that would interfere with bone metabolism
• Craniofacial syndromes
• congenitally missing or extracted permanent teeth.
• periodontally compromised patients
• smokers
• pregnant women
• previous orthodontic treatment

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

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56 participants in 4 patient groups

2-week reactivation interval

Experimental group

Description:

Replacement of elastomeric chain every 2 weeks and reestablishing a 150 g force

Treatment:

Procedure: Canine retraction

4-week reactivation interval

Active Comparator group

Description:

Replacement of elastomeric chain every 4 weeks and reestablishing a 150 g force

Treatment:

Procedure: Canine retraction

6-week reactivation interval

Experimental group

Description:

Replacement of elastomeric chain every 6 weeks and reestablishing a 150 g force

Treatment:

Procedure: Canine retraction

8-week reactivation interval

Experimental group

Description:

Replacement of elastomeric chain every 8 weeks and reestablishing a 150 g force

Treatment:

Procedure: Canine retraction