METHOD FOR MEASURING CURVATURE OF ROOT CANAL OF TOOTH Russian patent published in 2015 - IPC A61B5/117 A61B8/13 G01N22/00 

FIELD: medicine.

SUBSTANCE: curvature of a root canal of a tooth is investigated by means of Picasso Trio, cone-beam computerised tomography with Ezlmplant software. The computerised tomography processes an image and transmits it to the computer. The Ezmplant software contains four active windows of object images: upper and lower teeth in frontal (coronal view), sagittal (sagittal view), axial (axial view) projections, and an object 3D-reconstruction. A section thickness of the dentofacial tissues is specified at 1 mm for all active windows of the image; after that an image of the examined tooth is selected in the required active window. The mouse cursor is passed in the active window, and the button Enter on the keyboard is pressed to remove the axes; the primary mouse button is pressed in the Measure section of the menu on the left to activate the function Angle. That activates the section Tool Options in the menu automatically, wherein the angle 4-point measurement method 4-Point Click is selected. Then the mouse cursor is passed beyond the tooth being guided by a tooth canal orifice and the mort actual point of the root canal lumen curvature for display purposes; the mouse button is pressed beyond the tooth to display the first point of the first line. The first line is drawn approximately through an apex of a triangle to be constructed and extends behind the tooth to cover the root canal lumen. The mouse button is pressed again to mark the second point of the first line; line No. 1 is produced as one side of the determined curvature angle of the root canal of the tooth - points 1 and 2. The cursor is moved onto the expected apex of the angle of the triangle describing the root canal curvature with the lines being continuous. The mouse button is pressed to mark the first point of the second line that is the third point. The cursor is displaced towards the root apex by drawing a line through it behind the tooth. The function Angle is deactivated; all four points of the angular structure are activated; their position is specified to produce the final curvature angle in degrees to be calculated automatically. The root canal curvature is taken into consideration when choosing the instruments for the high-grade endodontal treatment of the root canal.

EFFECT: method enables measuring all the root canal curvature angles precisely by enabling the multiple activation of all the elements of the angular structure and correcting positions of the points and lines of the angular structure.

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