| 摘要 |
The invention describes a method of determining virtual tooth restorations on the basis of scan data (D) of oral structures, wherein a model database (DB) comprising a number of parameterized tooth models for each of several tooth types is used, whereby the parameterization is carried out on the basis of model parameters comprising position parameters and/or shape parameters and whereby each tooth model (M) is linked with a number of tooth models (M) of the same tooth type, and wherein, for each desired tooth type, an optimal tooth model (M) in the model database (DB) is determined by means of an iterative method in which initially at least one start tooth model (M) of the desired tooth type is selected from the model database (DB), and subsequently, commencing with this start tooth model (M), in each iteration step (S) a tooth model (M) is tested with regard to a quality value, wherein for individualization, the tooth model (M) currently in test is adjusted to the scan data (D) by varying model parameters and a quality value is computed for this individualization. Furthermore, at least one tooth model (M) linked with the tooth model (M) in test is also, for individualization, adjusted to the scan data (D) by variation of model parameters and a further quality value is computed for this individualization. On the basis of the computed quality values, a new tooth model (M) in test of the desired tooth type is selected if necessary from the model database (DB) for the next iteration step (S). Iteration is interrupted upon reaching a quality criterion, and finally at least one virtual tooth restoration is determined from among the optimal tooth models (M) and scan data (D). The invention also describes a method of generating a model database (DB) for use in such a method, a method of manufacturing or selecting a tooth restoration part, and a tooth restoration determination system (5) for determining virtual tooth restorations. |
