Dentistry – Orthodontics – Method of positioning or aligning teeth
Patent
1997-05-20
1999-03-09
Lewis, Ralph A.
Dentistry
Orthodontics
Method of positioning or aligning teeth
A61C 300
Patent
active
058791582
ABSTRACT:
From a negative impression of a patient's teeth, a positive hard duplicate pattern such as a stone model of the teeth is made. A digitized three dimensional coded image of the teeth is then generated by means of a coordinate measuring machine or by laser scanning. The central axis of each tooth is then displayed in an exploded image of the set of teeth and each tooth is moved in virtual space to a desired position and orientation using torque, tip and angulation values as well as in/out position information provided by the selected orthodontic bracket system. The optimum position of each tooth-mounted orthodontic appliance bracket and its attachment point to its associated tooth for moving the tooth to a desired orientation and position is then determined using the digitized coded images of each tooth including its central axis in its initial and final desired position and orientation. Using this bracket attachment information for each tooth, the shape and contour of a bracket attachment jig is determined for each tooth and this information in digital form is used to fabricate a plurality of such jigs under computer control such as by using a computer numeric control (CNC) milling machine for attaching an off-the-shelf, conventional orthodontic bracket to each tooth. Conventional archwires attached to the upper and lower optimally positioned brackets urge each tooth to its respective desired position and orientation with minimal subsequent manipulation and adjustment of the archwires by the orthodontist.
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Doyle Walter A.
Franseen Steven
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