Patent ID: 7223099

Claim:
A method of determining a torque angle of an orthodontic bracket for use in a treatment of teeth malposition of a human dentition, the method comprising the following steps: a) determining an angle enclosed between a bracket plane and an axis-orbital plane of a dentition, and for each tooth to be treated b) measuring positions of two predetermined points on a lingual side of an incisor and of a cuspid tooth, and three predetermined points on cusps of a premolar and molar, respectively, c) measuring positions of two further predetermined points defining attachment positions of a bracket on a labial side of the respective tooth, d) predetermining an individual target angle of intersection between the axis-orbital plane and one of a guiding straight line defined by said two predetermined points of an incisor or a cuspid tooth and a guiding plane defined by said predetermined points of a premolar and molar, respectively, e) determining the angle of intersection of a straight line extending through said further two points on the labial side of the respective tooth with the bracket plane in consideration of said predetermined target angle of intersection between the axis-orbital plane and said guiding straight line and guiding plane, respectively, and f) determining a deviation of an angle of intersection of said straight line extending through said further two points on the labial side of the respective tooth with the bracket plane from a vertical onto the bracket plane, wherein this deviation represents the torque angle.