METHOD FOR DIGITAL MODELLING OF BASE AND BITE BLOCK ON UPPER JAW WITH FORMATION OF PROSTHETIC PLANE Russian patent published in 2024 - IPC A61C7/00 A61B8/13 G06T1/00 G06T17/00 

FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely to orthopaedic dentistry, and can be used for digital modelling of the base and bite block on the upper jaw with the formation of a prosthetic plane in which the height of the upper lip is pre-measured. At least 6 radiopaque marks of filling material are applied on hard palate in projection of roots of teeth 1.2, 1.4, 1.6, 2.2, 2.4, 2.6. A prosthetic bed on the upper jaw is scanned by 3D optical scanner and an optical impression thereof is obtained. Cone-beam computed tomography of the facial skull with temporomandibular joints and marks on the prosthetic bed is performed. Based on the obtained combined optical impression and cone-beam computed tomography data, a virtual Camper’s plane is formed, passing through the base point of the anterior nasal spine and the geometric centre of the bony external auditory canal. A virtual prosthetic plane is constructed in parallel from the Camper’s plane by the height of the upper lip plus 2 mm, after which a basis with thickness of 2.0–2.5 mm is modelled along the anatomical and topographic boundaries of the removable prosthesis. Then, a bite block height is simulated, the height of which is determined by the distance from the base in the region of the alveolar process apex to the previously formed prosthetic plane. In the vestibular-oral direction, the block is modelled from the middle of the alveolar process to the palatal side by 4.0–5.0 mm. On the vestibular surface of the block, retention holes are modelled to hold the wax portion; thereafter, a base with a bite block is made using additive techniques. Vestibular part of blocks is made from dental wax.

EFFECT: method provides higher accuracy and simplification of determining the patient’s personalized prosthetic plane by modelling a base with bite blocks in a digital environment and further use in a digital or manual articulator.

2 cl, 7 dwg, 3 ex