METHOD FOR PRODUCING AN IMPRESSION OF A MIDDLE FACE AREA FOR MAKING AN EXOPROSTHESIS WITH SUPPORT ON IMPLANTS Russian patent published in 2021 - IPC A61C9/00 

FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely dentistry to orthopedic and maxillofacial prosthesis, and can be used in obtaining an impression of the middle face area for making exoprostheses with support on implants of lost parts of the face as a result of congenital and acquired flaws and defects. Preliminary diagnostic imprint of the face is made, from which the diagnostic model cast from gypsum is cast, an anatomical boundaries of the future impression are made on the gypsum model for making the exoprosthesis, the upper boundary of the impression being applied at 1.0 cm above the line of superciliary arches, the lower one - along the line of lips closing, lateral borders - along vertical lines passing from the lateral edge of the eye to the line of lips closing on the left and on the right, marking the planned areas of the support implant platforms location, then the gypsum model with markings is used for making the reinforcing perforated mesh structure, wherein the area inside the marked anatomical boundaries is uniformly filled with the heated wax layer of thickness 0.2 cm, photopolymer plates with width of 1.0 cm are continuously placed along perimeter of marked boundaries and then plates are laid in series in parallel and perpendicular to each other, forming a reinforcing frame mesh structure, wherein the first plate is laid at angle of 40-45 degrees relative to the lips closing line, wherein cells 0.5-1.0 cm are formed such that they are as much as possible located above planned platforms of support implants, if necessary, such cells are formed by means of a conical tooth-milling cutter, in the center of the reinforcing frame forming a handle-handle for manipulating the frame, carrying out photopolymerisation and macrocontouring of the frame, ready reinforcing frame is used after completion of stage of integration of support implants in patient and installation of abutments on them so that patient is seated in dental chair, Vaseline layer is uniformly applied on face skin, cast impression transfers are fixed on abutments of integrated support implants, first layer of impression material of low hardness is applied, equal to 12 Shore, filling the entire anatomical area of the face according to the borders of the reinforcement structure, including the defect area, the face areas subject to the impression, all undercuts and folds, completing application of first layer in area of abutments of implants and impression transfers in plentiful portion of impression material, reinforcing frame is installed until contact without compression to first layer and is applied with second layer of silicone mass with hardness of 40 Shore, filling all cells and tightly distributing it around pre-positioned in perforations and cells of implants of impression transfer, removing finished impression by handle after final hardening of material.

EFFECT: method increases accuracy of impression; avoiding the possibility of pulling off impression; reducing the risk of impression deformation, characterized by simplicity and ergonomics of the impression for the doctor with a significant reduction of the clinical stage duration, which is determined by the setting time of the impression material; absolute safety and comfort for patients, including oncological patients; high casting capabilities for making an exoprosthesis of the face with support for integrated implants; increased comfort of patient rehabilitation.

1 cl, 2 ex, 6 dwg