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- Title
Mini-screw implant or transpalatal arch-mediated anchorage reinforcement during canine retraction: A randomized clinical trial.
- Authors
Sharma, Mohit; Sharma, Vineet; Khanna, Bharat
- Abstract
Objective: To compare mesial movement of upper first molars during maxillary canine retraction using a pre-adjusted edgewise appliance provided by anchorage reinforcement and a transpalatal arch or mini-screw implant. Design: Randomized clinical trial. Setting: Department of Orthodontics and Dentofacial Orthopedics, Armed Forces Medical College, Pune, India. Subjects and methods'. From a cohort of subjects requiring the extraction of both upper first premolars and pre-adjusted edgewise appliances to correct their malocclusion, a total of 30 were randomly allocated to receive two different forms of anchorage reinforcement: Group A - receiving mini-screw implant and Group B- receiving a transpalatal arch Group A subjects received titanium mini-screw implants placed at the start of treatment between the maxillary second premolar and maxillary first molar. Maxillary second premolars were secured to the mini-screw implants using of 0.010-inch stainless steel ligature wire. Group B subjects received a custom-made transpalatal arch which was soldered to maxillary first molar bands. Active canine retraction was initiated in both groups on placement of a 0.019 x 0.025-inch stainless steel archwire using nickel titanium closed coil springs. Outcome measures: Mesial movement of the upper first molars as measured on pre- (Tl) and post-treatment (T2) lateral skull radiographs. Results: The results showed that in Group A the mean mesial movement of the first molars between Tl and T2 was 0.0 mm (SD 0.02; P=0.90), whereas in Group B there was a mean forward movement of the first maolars of 2.48 mm (SD 0.71; P<0.001). Conclusion: In this trial, mini-screw implants placed prior to levelling and aligning were able to provide absolute anchorage during maxillary canine retraction, in contrast to a transpalatal arch.
- Subjects
DENTAL screws; CUSPIDS; CLINICAL trials; MALOCCLUSION; NICKEL-titanium alloys; BICUSPIDS; DENTAL pathology; PATIENTS
- Publication
Journal of Orthodontics, 2012, Vol 39, Issue 2, p102
- ISSN
1465-3125
- Publication type
Article
- DOI
10.1179/14653121226878