METHOD OF DIAGNOSTICS OF RETRACTED TEETH WITH CONE-BEAM COMPUTED TOMOGRAM OF UPPER JAW Russian patent published in 2018 - IPC A61B6/03 

FIELD: medicine.

SUBSTANCE: invention relates to medicine, dentistry, is intended to determine the levels of the location of the retracted teeth of the frontal section (incisors, canines of the upper jaw) with a cone-beam computed tomogram (CBCT). After CBCT on the sagittal plane of the tomogram, two horizontal lines are drawn: one through the points Spina nasalis anterior (Sna) and Spina nasalis posterior (Snp), another through the apical basis of the upper jaw. Vertical distance between these lines is divided into three equal parts and horizontal lines – levels are drawn through the obtained points. First level of the teeth is located between the two lower lines, the third – between the top two, the second – in the middle. Vertical distances between the horizontal lines correspond to the size of the crown of an impacted tooth. To determine the levels and carry out measurements, the obtained X-ray image in three planes is displayed on the computer monitor screen: coronary, axial, sagittal, and also a three-dimensional image. In the window of each slice, a rectangular coordinate system X, Y and Z is drawn, with which three-dimensional measurements are performed on the three-dimensional image. Measurement of the axis of inclination of the lamellar tooth of the patient is carried out by constructing an angle, one side of which is the median axis of the lined tooth, and the second is a line drawn parallel to the horizontal axis of the rectangular coordinate system in the sagittal plane and parallel to the vertical axis of the coordinate system in the coronary and axial planes. Based on the measurement results, the level of position and inclination of the lamellar tooth is diagnosed.

EFFECT: method provides accurate determination of the topography of the retained tooth, the formation of a fundamentally new approach to orthodontic treatment of the retention of the teeth, the unerring choice of the surgical technique, the topographic guide for exposing the crown of the retained tooth.

1 cl, 8 dwg, 1 ex