METHOD FOR RESECTION OF PART OF ROOTS OF MOLARS OF LOWER JAW Russian patent published in 2021 - IPC A61B17/24 A61C8/00 

FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely to dental surgery. At the stage of planning dental treatment, computed tomography of the lower jaw and scanning of the lower dentition are performed, the images obtained are combined in a computer program for modeling dentures and a navigation template is simulated - a mouthguard that overlaps the teeth of the jaw segment required for the operation from the oral surface to the level of the clinical equators, and with the vestibular surface extending to the transitional fold of the mucous membrane of the alveolar bone. In the template, in the area of the proposed operation, namely in the projection of the destructive bone focus of the root of the tooth, a rectangular hole is formed along its borders. The walls of the template defining the holes are 2 mm thick, and the inner bevel is made at an angle of 75° with respect to the bone. L-shaped retention elements are modeled 2 mm from the upper and lower edges of the hole on the inner surface of the template facing the bone. The virtual model of the template is converted into a physical one by means of an additive computer method for producing 3D printing from a biocompatible dental polymer, after which the template is post-printed and sterilized. In the operation area, anesthesia is performed and the template is fixed. In the middle of the hole in the template, a horizontal incision is made to the bone, placing the scalpel blade perpendicular to the bone. The template is removed and the incision is extended in the distal directions. Separation of the mucous membrane connected to the periosteum is carried out in a vertical direction equidistant from each other. The template is fixed on the teeth so that the edges of the mucous membrane with the attached periosteum are fixed equidistant from the edge of the hole in the template by means of L-shaped retention elements. Skeletonized bone is visualized in the lumen of the template hole, after which a trepanation window is cut out with a surgical disk, accessing the root of the tooth. When cutting, the disc is placed along the edges of the template window, pressing it against the walls along the plane, providing a drilling angle of 75° in relation to the bone. The bone block is separated with a dental chisel, the root apex is resected. A retrograde filling is performed, after which the previously separated bone block is placed back into the bone defect of the jaw, the template is removed, the edges of the incision are placed in place and sutured with interrupted sutures.

EFFECT: method allows reducing the traumatism of the operation and prophylaxis of postoperative complications.

1 cl, 1 ex