Patent RU-2306113-C2 (RU)
Title: Method for building three-dimensional face and dental rows images juxtaposed in correct positions relative to each other
Inventor: RJAKHOVSKIJ ALEKSANDR NIKOLAEV
IPC: A61C9/00
Filed: 2006-09-28
Granted: 2007-09-20
Abstract: FIELD: medicine. 
     SUBSTANCE: method involves taking optical casts of smiling patient face and of face with imprint in the oral cavity. Markers are placed on external surface of the imprint spoon as impressed relief. Imprint is taken from patient mandible and plaster models are molded of the mandible and maxilla. The maxillary plaster models is scanned twice with imprint put on and then without it. Mandible model is scanned independently. Patient face casts are juxtaposed. The juxtaposition is carried out in matching points placed in identical regions on the optical casts. Two three-dimensional patient face models are produced: one smiling and the other one with imprint having the same coordinates in the identical regions. The mandibular and maxillary optical casts and maxillary one with imprint are loaded into virtual space. The three-dimensional maxillary model is juxtaposed with three-dimensional maxillary model with imprint and three-dimensional mandibular model is set under in central occlusion. Two three-dimensional maxillary models: one of which has imprint and the other one without the imprint, and three-dimensional mandibular model are produced in this way. The three-dimensional mandibular model is placed in central occlusion to the maxillary one so that juxtaposition is carried out in matching points placed in identical regions. Then, optical casts of the face and jaws are juxtaposed with respect to relief on the external surface of the imprint spoon by selecting the like points having markers. Another version of the method is as follows. Optical cast of smiling patient face is produced with reference objects fixed on teeth. Imprint is taken from patient maxilla with the reference objects. Imprint is taken from patient mandible. Maxillary model having reference objects and mandibular model are molded. Maxillary model is scanned twice: first with reference objects put on and then without them. Mandible model is scanned independently. Then, juxtaposition is carried out in matching points placed in identical regions or by matching congruent surfaces. Three-dimensional patient face model with smile and reference objects is produced. The mandibular and maxillary optical casts and maxillary one with reference objects are loaded into virtual space. The three-dimensional maxillary model is juxtaposed with three-dimensional maxillary model with reference objects and three-dimensional mandibular model is set under in central occlusion. Two three-dimensional maxillary models: one of which has reference objects and the other one without them, and three-dimensional mandibular model are produced in this way. The three-dimensional mandibular model is set under the maxillary one. The juxtaposition is also carried out in matching points placed in identical regions or by matching congruent surfaces. Then optical face casts are juxtaposed with jaw casts on reference objects by choosing the like points with traced markers or with respect to congruent surfaces. 
     EFFECT: wider range of means for physician to plan treatment course. 
     2 cl, 4 dwg