The present invention relates to a method of generating a tooth model for performing a simulation in a dental procedure, and more particularly, to a method of generating a 3D head image based on head tomographic image data, and a 3D marking point on a 3D oral surface model and a 3D head image extract each tooth region and apply the process of the match, and obtains the 3D tooth crown model to extract each of the teeth from the matched 3D oral surface models, to apply the technique of extracting a region of interest from the 3D head image by by a technique directed to after creating a 3D volume model tooth, generating a 3D teeth model by synchronizing to the coordinate system of the 3D tooth crown model and the 3D tooth model volume. That is, since the 3D mouth surface model, which is the base data of the 3D tooth crown model and the 3D tooth volume model, is matched with the 3D head image, the 3D tooth crown model and the 3D tooth volume model are matched, , to a tooth model generation method for a dental procedure simulation provided by synchronizing to use the same coordinate system, to reflect the deformation of the teeth and the mouth structure according to the orthodontic in real time to a teeth model.According to the present invention, a tooth model generated based on a precise gypsum model and the like without the diagnosis information of a conventional root, and a tooth model that maintains diagnostic information even though an error rate is generated due to data limit using an existing human body x-The method of generating a new tooth model and extracting the 3D tooth surface model that can extract the crown portion of the whole tooth without any additional cost or equipment by an easier method than the conventional method, , a relatively simple diagnostic information to have been formed by those based on the creation of a 3D tooth volume models to perform simulations to reflect this in real time in dental procedures, as well as to retain the diagnostic inf
