| 摘要 |
The invention relates to a method for determining virtual tooth restorations on the basis of scanned data (D) of oral structures, in which a model database (DB) is used, which contains a number of parameterized tooth models (M) for each of a variety tooth types, wherein the parameterization is carried out on the basis of model parameters which comprise position and/or shape parameters, and wherein each tooth model (M) is linked with a number of tooth models (M) of the same tooth type (L). For each desired tooth type, an optimal tooth model (M) is determined from the model database (DB) using 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 then, starting with said start tooth model (M), during each iteration step (S) a tooth model (M) is tested with respect to a quality value. The tooth model (M) to be currently tested is adapted to the scanned data (D) by varying model parameters for customization purposes, and a quality value is calculated for the customization. In addition, at least one tooth model (M) to be linked to the tooth model (M) to be tested is likewise customized, and a quality value is calculated. On the basis of the calculated quality values, optionally a new tooth model (M) to be tested of the desired tooth type is selected from the model database (DB) for the next iteration step (S). The iteration is terminated when a quality criterion is reached, and finally at least one virtual tooth restoration (R) is determined from the optimal tooth models (M) and scanned data (D). The invention further relates to a method for generating a model database (DB) for use in such a method, to a method for producing or selecting a tooth restoration part, and to a tooth restoration determination system (5) for determining virtual tooth restorations (R). |
