| 摘要 |
An orthodontic bracket is provided with a base shaped to correspond to the profile of the specific tooth to which it is to be attached. The shape of the base facilitates the visual placement of the bracket on the tooth of a patient by visually signaling to the practitioner the positioning of the bracket with its base centered on the facial side of the tooth. This invention facilitates the positioning of the archwire support of the bracket at a position on a tooth that may be offset from the facial axis or from the center of the face of the tooth by manufacture of the bracket with the support offset from the center of the tooth-shaped base. Preferably, the appliance base is a scaled reduction of the profile of the tooth, viewed from its facial side. The archwire support includes tie wings that have parallel sides and are fixed to the base with their tips defining between them the archwire slot that defines a reference line. The archwire slot is orientated parallel to the occlusal plane of a patient and the tie wings are inclined at an oblique angle to the reference line and generally vertically disposed parallel to the tooth long axis when the base is placed on the facial side of the tooth and visually adjusted so that the perimeter of the base is congruent with the outline of the tooth. The tips of the tie wings have top and bottom surfaces in mutual alignment parallel to the reference line and substantially equidistant therefrom. The tie wings together form a rhomboidal configuration and the axis of the archwire slot bisects the tie wings so that the tips are of equal size.
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