Rectangular loops in inconsistent force systems: a laboratory investigation
| Autor: | Adriano Giacomo Crismani, Josef Freudenthaler, Ursula B. Hofschneider, Ernst G. Köle, Thomas Bernhart |
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| Jazyk: | němčina |
| Rok vydání: | 2003 |
| Předmět: |
Molar
Orthodontics Materials science Tooth Movement Techniques Orthodontic Brackets Bent molecular geometry medicine.disease Models Dental Biomechanical Phenomena Loop (topology) Dental arch medicine.anatomical_structure stomatognathic system Premolar medicine Orthodontic Wires Torque Humans Orthodontic Appliance Design Oral Surgery Malocclusion Arch |
| Zdroj: | Journal of orofacial orthopedics = Fortschritte der Kieferorthopadie : Organ/official journal Deutsche Gesellschaft fur Kieferorthopadie. 63(2) |
| ISSN: | 1434-5293 |
| Popis: | Material and Method: The force system delivered by the rectangular loop (R-loop) was the subject of this in-vitro investigation. The correction of a first-order irregularity was simulated in an inconsistent force system. Three types of R-loop made of 0.017"×0.025" TMA wire but differing in length and insertion system were tested in a 3D strain gauge (Hottinger™, Darmstadt, Germany). The buccal segment consisted of one molar and two bicuspids, with the first bicuspid as an active unit scheduled to be moved buccally into the dental arch. Results: The first R-loop tested revealed too high a force magnitude to be recommended for clinical use. A loop connecting only two teeth and bypassing the second premolar delivered a favorable initial force of 85 cN with a drop of 20 cN per 1 mm deactivation. In order to achieve a translatory tooth movement, a buccal root torque must be bent in addition into the short horizontal leg of the R-loop. The use of a transpalatal arch is indispensable if adverse side effects are to be avoided. |
| Databáze: | OpenAIRE |
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