METHOD FOR MASTICATORY EFFICIENCY RESTORATION OF LOWER AND UPPER MOLARS WITH DAMAGED ROOTS Russian patent published in 2015 - IPC A61C8/00 

FIELD: medicine.

SUBSTANCE: computed tomography of an involved jaw segment with a causative tooth is carried out. A causative molar is prepared for a dental post-and-core inlay according to common technique. Dental arches of the jaws are scanned with an intraoral chamber. An image is transferred to a computer unit of CAD/CAM system, wherein it is compared to tomography findings. A future transdental implants are computed-planned in a greatest diameter related to a root thickness at the level of the planned resection; they might be also irrespective of the root canal arrangement provided there is a 2-mm space available from natural anatomical structures - a low inferior dental canal and a maxillary sinus. The CAD/CAM system is used to reduce a volume over the whole external implant so as to form a 30-mc gap between the implant and root canal walls. A stump portion of a dental crown is shaped taking into account an occlusion surface of antagonists; the above stump portion is supposed to have a circular external shoulder of 135 degrees and guide through holes having a diameter, which is 30 mc more than that of the implants; the holes are arranged so that the pre-shaped implants penetrate through the thickness of the stump portion. An artificial crown having a masticatory surface fitting an axial load of an occlusion portion of the antagonists is shaped above the stump portion. The created virtual model of the transdental implants and stump portion is milled of dental titanium, and the artificial crown - of metal to be faced. Simultaneously with making the above structures, a short-length dental splint structure comprising the causative and two neighbour teeth, extending along their lingual surfaces, and overlapping clinical equators of the crown by 0.5 mm and stopping 2 mm short of a marginal gum is formed on the virtual denture model with the causative tooth, then milled of composite and fixed on the teeth. During the next visit, the root of the causative tooth is excised or amputated, and sharp edges of the root stump are smoothed down. The stump portion pre-milled of titanium is milled onto the prepared dental surface. After excessive cement is removed through the stump holes, the root canal walls are prepared through an intraoperative defect with using a mill fitting the transdental implant diameter. Glass-ionomer cement is introduced into the root canal, and the transdental implant is fixed. The intraoperative defect is filled with a bone-replacing preparation. The wound is closed. The artificial crown is fixed.

EFFECT: method enables making the individual transdental implant with suprastructure and artificial crown, the occlusion surface of which matches with the axial load of antagonist tubercles, thereby avoiding a traumatic node formation.

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