The Effectiveness of Double-slot Brackets Versus Single-slot Brackets on the Rate of Canine Retraction

Eligible patients will be examined for fulfilling the inclusion criteria. All the recruited patients need extraction of upper first premolars followed by canine retraction with maximum anchorage.

The patients will be randomly allocated to one of the two groups; either Double slot brackets or single slot-brackets group.

In Double slot bracket group, Canine retraction will be made on two 0.016'' StSt (stainless steel) round wires, each in one of the slots of the double slot brackets. while in single slot-bracket group, Retraction will be made on one 0.017''×0.025'' rectangular StSt arch wire .

The patients will be seen on a monthly basis for follow up visit for reactivation of retraction to maintain constant force during the study. An impression will be taken for the patients every visit, fabricated dental models will be digitally scanned. The scanned models will be used to monitor the rate of canine retraction.

Every patient will be asked to take a CBCT image of the upper arch pre Retraction and after the completion of study duration (3 months). After data collection, assessors will carry on the measurements blindly. Statistical analysis of the data will be done and the results will be compared to evaluate the effectiveness of both techniques for canine retraction.

Inclusion criteria

• Good oral hygiene.
• Adult Male or Female patients with an age range of 16-26 years old.
• Full set of permanent dentition(excluding third molar).
• Any kind of malocclusion requiring first premolar extraction and canine retraction.
• Patients with type/pattern of crowding that allows leveling and alignment before premolar extraction

Exclusion criteria

• History of previous orthodontic treatment.
• Craniofacial deformity.
• Systematic disease or administrating drugs affecting tooth movement.
• Poor oral health.