| 摘要 |
A removable orthodontic appliance is firmly seated on the teeth on each side at a midregion by clasps which provide a base for a label filament serving as a reference arch, and curved lingual spring filament which urges the teeth against the reference. The lingual filament provides a gentle but constant force over a substantial distance to cause repositioning of selected teeth without the need for frequent readjustments. The mountings for the filaments comprise open loops having filament receiving sleeves at each end by means of which the positions and angles of the filaments may be adjusted but the filaments may be coupled in solely by mechanical means. The lingual filament may comprise a memory alloy having a temperature transition below normal body temperature so that it may initially follow the irregular profile of the teeth and continue to exert pressure over a substantial distance as the teeth are repositioned. A retainer device may use synthetic resin filaments of transparent material to hold the teeth against relapse.
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