METHOD FOR DETERMINING POSITION OF HEAD OF LOWER JAW BY X-RAY ANATOMICAL LANDMARKS Russian patent published in 2025 - IPC A61B6/51 A61B6/02 A61B6/03 

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely to maxillofacial surgery. X-ray anatomical landmarks of craniometric points are detected by the image of the skull bones in the axial projection of cone-beam computed tomography (CBCT). Thereafter, the median-sagittal and frontal planes of the head of the lower jaw (HLJ) and the craniometric point of the HLJ formed by the point of intersection of these planes are determined. A craniometric point of a coronal process of the lower jaw, a vomer and a sphenoid bone is determined. X-ray anatomical planes are plotted on craniometric points. Angular relationships and stable X-ray anatomical relationships between the constructed planes are determined. If HLJ is present, a median-sagittal plane of HLJ is built through a craniometric point of HLJ and infraorbital foramen. In the absence of HLJ, a median-sagittal plane of the HLJ is built through an infraorbital fossa and a centre of a mandibular fossa of the temporal bone, which is determined by inscribing a circle in the projection of its contours, the centre of which is taken as the centre of the HLJ. Then relationships between angles formed at intersection of median-sagittal and frontal planes are determined to determine true position of head of lower jaw in relation to other bones of skull.

EFFECT: method makes it possible to determine the location of the head of the lower jaw at the stage of planning an orthognathic operation, including in its absence, to perform the correct positioning of the endoprosthesis in the space of the mandibular fossa of the temporal bone and its subsequent correct fixation to the ramus of the lower jaw, while eliminating the risks of complications of treatment and optimizing the length of rehabilitation of the patient, provide a predictable clinical result in reconstructive surgery, endoprosthesis replacement of temporomandibular joints and total replacement of mandibular fragments.

1 cl, 12 dwg, 3 ex