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Applications of Surface–Surface Matching Algorithms for Determination of Orthodontic Tooth Movements

2003; Taylor & Francis; Volume: 6; Issue: 5-6 Linguagem: Inglês

10.1080/10255840310001634403

1476-8259

Ludger Keilig, K. Piesche, Andreas Jäger, Christoph Bourauel,

Dental Radiography and Imaging

Orthodontic tooth movements are described as the differences between initial and final tooth positions. A computer based method for determination of tooth movements for different treatment methods was developed. A total of 20 casts of the upper jaw of patients treated with tooth positioners or fixed appliances were used as a basis for this study. Tooth movement was analysed on casts before (C i) and after treatment (C f). The casts were digitized either with a COMT or 3D laser scanning systems. After digitization, the models were superimposed in the palate by using a surface–surface matching algorithm. Tooth surfaces of the orthodontically moved teeth were segmented and determination of tooth movement was accomplished by matching the moved teeth from C i to C f. The resulting transformations delivered three dimensional information on translations and rotations. An accuracy of 0.2 mm in translations and 1 degree in rotations could be demonstrated, showing the different efficiency of treatment schemes.