| 摘要 |
A computer-based system and method facilitate placing virtual orthodontic brackets with respect to a virtual model of a set of teeth. The teeth are displayed for the user, who places reference points, lines, or other reference features on the depiction, such as interproximal contact points, cusp tip points, tangent lines that define facio-lingual angles, etc. The system then computes a position of the virtual model with respect to a reference system of three mutually perpendicular (X, Y and Z) axes from the reference points, lines or other reference features. The brackets can then be positioned in accordance with the reference system. The system generates data representing the positions of the brackets with respect to the virtual model. That data can be output in the form of a data file. In addition, that data can be used to generate a data file representing a virtual model of a transfer tray conforming to the set of teeth. The transfer tray data file can then be used as input to a rapid prototyping machine to enable the machine to make a real transfer tray. A transfer tray made in this manner has voids with slot-like portions in which the real (non-virtual) brackets are to be received so that the brackets can be transferred to the patient's mouth and adhered to the teeth.
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