[Using the three-dimensional scanning method to determine the preservation criteria of a biological object for...

The development of modern digital technologies in the field of three-dimensional scanning and the construction of three-dimensional models of human body parts are relevant tasks in conducting forensic medical (medical-criminalistic) examinations for identifying the identity of deceased persons and for monitoring the long-term preservation of research objects, particularly the face of a deceased person.

The purpose of the study is to experimentally evaluate the reproducibility of the results of the 3D face scanning methodology for determining some criteria for preserving the volume of soft tissues and the relief of skin of a model biological object.

In accordance with the previously developed method of 3D scanning of body parts of an embalmed human body, three-dimensional images of the face part of the head of a model biological object, which is on long-term preservation with ensuring the preservation of the appearance, were obtained. To obtain three-dimensional images of the surface of the object, a 3D scanner Stereoscan 5MP (Breuckmann GmbH, Germany) was used, and for subsequent processing, comparison and analysis of images, specialized computer programs Optocat 2007 (Breuckmann GmbH, Germany) and GOM Inspect V8 (GOM, Germany) were used.

The evaluation of the obtained three-dimensional images and the three-dimensional models based on them showed high reproducibility of the method's results, which allowed us to determine a set of criteria for preserving the volume of soft tissues and the skin relief of the face part of the embalmed human body during its long-term preservation, namely, the acceptable average and maximum deviations in the geometry of the three-dimensional images and 3D-models of the face.