PHOTOGRAMMETRIC METHOD OF OBTAINING A DIAGNOSTIC 3D MODEL OF THE JAW

Abstract

Solving the problem of obtaining a highly precise three-dimensional digital model of the jaws is of extreme importance, given the widespread introduction of computer diagnostics and precision manufacturing methods into dental practice. The high cost of scanning equipment and software limits the possibility of using digital protocols by a wide range of doctors, therefore, photogrammetry is one of promising areas of scientific research and improvement of the existing developments on the way to solving this problem. Simple, generally available and relatively cheap equipment for photogrammetry allows rapid implementation of digital protocols into dental practice. Having studied the literature sources on the technical implementation of the photogrammetric method of obtaining a three-dimensional model of the jaws, the authors suggested their own algorithm of photographing the physical model and further processing of digital information to obtain a 3D model. The algorithm consisted of 50 frame photographing of a plaster model. Photography was carried out in two series of 25 pictures each (horizontally and at 45 degrees angle to the occlusal plane of the model dentition. The technical difference of the suggested method is the use of a rotary table with colored marker tapes and the maximum LED lighting of the photobox, which ensures shadowless photography. The digital photogrammetric processing of the received photos was carried out with the help of Zephyr Free v.6.513 software (3DFlow, Italy). This free software allows you to obtain and archive a 3D model of the jaw for further diagnostic or technical work. The high visual quality of the virtual models obtained by the abovementioned method requires further experimental verification in terms of exact correspondence to the original.