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Schaus, J.G. Nikolai, R.J.

Published in American Journal of Orthodontics

Elastic bending (flexure) theory, although apparently extendable to the arch wire, incorporates assumptions that are violated in orthodontic application, and neglects several influences confined to the clinical arena. The standard elastic-bending test for orthodontic wires uses a passively straight segment of wire, and a rotational bending stiffnes...

Initial displacements and variations of eight human child skulls owing to high-pull headgear traction determined with la...

Kragt, Gerrit Duterloo, Herman S. Algra, Annemiek M.

Published in American Journal of Orthodontics

In this study eight macerated, human child skulls (dental age approximately 9.5 years) were subjected to a standardized high-pull headgear traction system. Tensile forces from 0.5 to 3.5 N (1 N = 0.1 kgf) per side were produced to the maxillae. Displacements of skeletal components were determined at 22 indicator points per skull by means of laser h...

Bonding to porcelain and gold

Wood, David P. Jordan, Ronald E. Way, David C. Galil, Khadry A.

Published in American Journal of Orthodontics

To test the effectiveness of bonding orthodontic attachments to porcelain, edgewise brackets were bonded to 160 lower incisor, porcelain denture teeth by means of two different resin systems and three different porcelain bonding agents. Bonding to porcelain was found to be not only effective, but the use of a porcelain primer before bonding resulte...

Statistical evaluation of torque angles in reference to straight-wire appliance (SWA) theories

Vardimon, Alexander D Lambertz, Wolfgang

Published in American Journal of Orthodontics

Inconsistency in torque data on diverse straight-wire appliance (SWA) attachments calls for reassessment of the SWA theories. This study evaluates the SWA theories and suggests predictive torque models. A custom-made torque angle gauge was used on models from 54 ideal occlusion subjects (34 orthodontically treated and 20 untreated cases). This stud...