| http://www.w3.org/ns/prov#value | - In contrast to the embodiment of FIG. 1, the slot 22 is, however, not lined with a separate reinforcement part but rather the plastic material of the bracket 20 is mechanically reinforced by the introduction in certain areas of inorganic, oxide material, in particular alumina in its trihydrate form, to such an extent that it has, with respect to the transfer of correction forces from the arch wire
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