| 摘要 |
PCT No. PCT/EP92/00559 Sec. 371 Date Sep. 1, 1993 Sec. 102(e) Date Sep. 1, 1993 PCT Filed Mar. 13, 1992 PCT Pub. No. WO92/16159 PCT Pub. Date Oct. 1, 1992.Auxiliary orthodontic appliance, namely expansion screw for the maxilla or mandible, bracket or buccal tube, which in order to improve its properties consists of titanium or an alloy on the basis of titanium and the surfaces of which are formed by a titanium oxide skin.
|
