| 摘要 |
A reinforced elastomeric non-hoop ligature comprises a thin flat body of the elastomeric material having incorporated therein a thin flat rigid insert of gingival-occlusal dimension greater than the corresponding dimension of the arch-wire receiving slot of the orthodontic bracket with which it is employed. The ligature body has holes or slots through which ligature retaining projections of the bracket body protrude, and when mounted on the bracket the rigid member straddles the bracket slot mouth. A reinforced hoop ligature comprises a torus of the elastomeric material with two diametrically opposed rigid inserts of gingival-occlusal dimension sufficient to straddle the bracket slot. The rigid insert or inserts increase the cooperative action between the arch wire and the ligature to facilitate the bracket and tooth movement, and when the arch wire is fully within the slot provides the possibility of controlling sliding friction between the arch wire and the bracket, including minimising when this is desirable. The mesial distal widths of the body and insert and the labial-lingual position of the insert can be varied in to provide the characteristics required.
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