METHOD FOR DETERMINING AND PLANNING DIRECTION AND DISTANCE OF DENTAL MIGRATION ACCOMPANYING ORTHODONTIC CARE Russian patent published in 2015 - IPC A61B5/103 

FIELD: medicine.

SUBSTANCE: diagnostic lines are drawn on an upper-jaw diagnostic cast model: a line along a median sagittal suture R, a median papillary cross line MPT and/or a cross line P; basic points O and/or O' and points of the dental surface B. They are drawn through the centre of a palatine papilla perpendicular to the line R, and the basic point P is marked in a crossing point of the above lines O. The line P is drawn through palatal recesses perpendicular to the line R, and the basic point O' is marked at the mid-distance between the palatal recesses on the line R. Diagnostic lines are projected on a lower-jaw diagnostic cast model: Rl, MPTl and/or Pl, the basic points Ol and/or O'l; the points are marked on the dental surface Bl. A width of four upper-jaw cutters is measured; the measured values are summed up to derive a parameter of 'total width of the cutters'. The lined upper- and/or lower-jaw models are photographed with a stand-mounted digital camera. The digital photographs of the models are inserted into a computer. The upper- and/or lower-jaw digital model images are displayed. The digital model is used to insert distances from the stable basic points to the point B and/or Bl of each tooth. On the basis of these data, the program constructs an actual arch pattern of the patient's dental arch. The parameter of 'total width of the cutters' is inserted into the program, which is used by the program to construct the pattern of one of four versions of the normal dental arches: version 1 'total width of the cutters' - 26.0-28.0 mm, version 2 - 28.1-30.0 mm, version 3 - 30.1-32.0 mm, version 4 - 32.1-34.0 mm. The normal and patient's actual arch patterns are compared according to the selected stable basic point and the points B and/or Bl on the dental surface, which are arranged on the actual arch pattern of the patient's dental arch and the normal dental arches in identical regions. The patterns are displayed as arches of various colours. The comparison results in imaging a position of the points B and/or Bl of each tooth of the actual arch as compared to a normal position, and a direction of actual tooth migration Z and a distance of the expected migration d to reach the normal value are presented.

EFFECT: computer overlaying of the estimated normal arches on the patient's dental arch, comparing the direction and distance of each tooth migration in two planes accompanying all the stages of orthodontic care enables the method improving the quality of diagnosing and orthodontic treatment, determining the direction and distance of the expected each tooth migration on the jaw to obtain the result, assessing the quality of the conducted orthodontic care.

3 cl, 5 dwg, 2 tbl, 2 ex