Mini-screw implant or transpalatal arch-mediated anchorage reinforcement during canine retraction: a randomized clinical trial.

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 0.019×0.025-inch stainless steel archwire using nickel titanium closed coil springs.

OUTCOME MEASURES:

Mesial movement of the upper first molars as measured on pre- (T1) and post-treatment (T2) lateral skull radiographs.

RESULTS:

The results showed that in group A the mean mesial movement of the first molars between T1 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.

• Authors: Mohit Sharma, Vineet Sharma, Bharat Khanna
• Journal: Journal of orthodontics (J Orthod) Vol. 39 Issue 2 Pg. 102-10 (Jun 2012) ISSN: 1465-3133 [Electronic] England
• PMID: 22773673 (Publication Type: Comparative Study, Journal Article, Randomized Controlled Trial)

Chemical References

• Dental Alloys
• Dental Materials
• titanium nickelide
• Stainless Steel
• Nickel
• Titanium

Topics

• Adolescent
• Bicuspid (surgery)
• Bone Screws
• Cephalometry (methods)
• Cohort Studies
• Cuspid (pathology)
• Dental Alloys (chemistry)
• Dental Materials (chemistry)
• Female
• Humans
• Male
• Maxilla
• Molar (pathology)
• Nickel (chemistry)
• Orthodontic Anchorage Procedures (instrumentation)
• Orthodontic Appliance Design
• Orthodontic Wires
• Stainless Steel (chemistry)
• Titanium (chemistry)
• Tooth Extraction
• Tooth Movement Techniques (instrumentation, methods)