The centered T-loop—A new way of preactivation

The force system of a prefabricated and preactivated T-loop used for reciprocal space closure was determined by simultaneously measuring the horizontal and vertical forces, as well as the moments using a computer controlled measuring apparatus. Interbracket distances of 21, 24, 27, and 30 mm were us...

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Bibliographic Details
Published in:American journal of orthodontics and dentofacial orthopedics 1995-08, Vol.108 (2), p.149-153
Main Authors: Hoenigl, Klaus D., Freudenthaler, Josef, Marcotte, Michael R., Bantleon, Hans-Peter
Format: Article
Language:English
Subjects:
Analysis of Variance
Dental Stress Analysis
Dentistry
Diastema - etiology
Diastema - therapy
Elasticity
Humans
Models, Structural
Orthodontic Appliance Design
Orthodontic Appliances
Orthodontics, Corrective - instrumentation
Orthodontics, Corrective - methods
Reproducibility of Results
Rotation
Stress, Mechanical
Tooth Extraction - adverse effects
Tooth Loss - etiology
Tooth Loss - therapy
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Summary:The force system of a prefabricated and preactivated T-loop used for reciprocal space closure was determined by simultaneously measuring the horizontal and vertical forces, as well as the moments using a computer controlled measuring apparatus. Interbracket distances of 21, 24, 27, and 30 mm were used to mimic typical clinical situations. At a loop activation of 7 mm, the anterior and posterior segments first underwent controlled tipping, then translation, and finally, root uprighting as the moment-to-force ratio increased with deactivation. After the loop has been deactivated to 4 mm, however, it should be exchanged to avoid root abutment. (A M J O RTHOD D ENTOFAC O RTHOP 1995;108:149-53.)
ISSN:0889-5406
1097-6752
DOI:10.1016/S0889-5406(95)70077-3