Results 181 to 190 of about 180,084 (227)
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Optimizing anterior and canine retraction
American Journal of Orthodontics, 1976Vertical loops or modified vertical loops are basically frictionless springs which are used for canine and anterior tooth retraction. The design and selection of a proper loop or retraction spring should be based on a number of scientific criteria.
C J, Burstone, H A, Koenig
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The effects of different sectional arches in canine retraction
The European Journal of Orthodontics, 1994The purpose of the present study was to compare the effects of Gjessing's canine retraction arch with a sectional arch including a reverse closing loop, which are both used for canine retraction in extraction cases. Our study involved both the maxilla and the mandible independently. After upper first premolar extractions and levelling of the teeth with
ISCAN, HN, DINCER, M
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Canine retraction: A photoelastic study
American Journal of Orthodontics, 19750 rthodontists have always been aware of the need for root control when a tooth is being moved through bone. I-3 However, of the early men, Case seemed to understand best the mechanics of root control, and he devised sophisticated appliances that attempted to shift coronally applied forces apically. He also denounced the many orthodontists who held the
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A novel removable appliance for canine retraction: a case report
Journal of Orthodontics, 2022This case report outlines the use of a modified Leighton’s retractor as a method for canine retraction in a patient with severe hypodontia, a history of aggressive periodontitis with tooth loss and idiopathic root resorption affecting multiple teeth. Treatment involved an upper removable appliance in combination with a lower sectional fixed appliance ...
Kelly Smorthit, Rachel Little
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An Evaluation of Different Methods of Canine Retraction
British Journal of Orthodontics, 1977A Variety of different methods (17 in all) of retracting a canine tooth using fixed appliances with edgewise brackets are discussed in detail. The methods have been divided into two groups involving sliding the tooth along the archwire and moving the tooth with the archwire. The advantages and disadvantages of each method have been outlined.
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Maxillary canine retraction, periodontal surgery, and relapse
American Journal of Orthodontics, 1980Extraction spaces closed during the course of orthodontic therapy tend to re-open, whereas orthodontically rotated teeth are prone to relapse. One of the major causes of spaces opening between teeth is the supra-alveolar soft tissues which do not always adapt to the new tooth positions.
A G, McCollum, C B, Preston
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Numerical simulation of canine retraction by sliding mechanics
American Journal of Orthodontics and Dentofacial Orthopedics, 2005Bone remodeling laws have been used to simulate the movement of a single tooth, but the calculations for simulating the movement of several teeth simultaneously are time-consuming. The purpose of this article is to discuss a method that allows the simulation of more complex tooth movements.A 3-dimensional finite element method was used to simulate the ...
Yukio, Kojima, Hisao, Fukui
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An investigation into the characteristics of the PG canine retraction spring
American Journal of Orthodontics and Dentofacial Orthopedics, 1994The forces and couples produced by a model of the PG maxillary canine retraction spring (Danish loop) when activated have been derived by using the complementary (strain) energy method. The theoretical results of the analysis have been verified by experiments on enlarged planar models in a special jig that, by means of strain gauges, was capable of ...
J D, Eden, N E, Waters
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A clinical study of maxillary canine retraction with a retraction spring and with sliding mechanics
American Journal of Orthodontics and Dentofacial Orthopedics, 1989The efficiency of maxillary canine retraction by means of sliding mechanics along an 0.018-inch labial arch and an AlastiK chain was compared with that using the canine retraction spring designed by Gjessing. The rate of canine retraction and degree of tipping, and rotation of the canines were studied in 21 subjects by one of these two methods on ...
P, Ziegler, B, Ingervall
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Retraction of Canines Using Bonded Tube-brackets
British Journal of Orthodontics, 1983Investigations using a Force Analyser were carried out to test the characteristics of retractor springs fitted to a removable appliance and designed for insertion into a tube-bracket, bonded to the buccal surface of a canine. The retractors were shown to produce a counter—rotation couple when activated on the typodont.
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