METHOD FOR SELECTING ORTHODONTIC THERAPEUTIC OPTIONS WITH OR WITHOUT EXTRACTION OF SINGLE TEETH Russian patent published in 2015 - IPC A61B5/103 

FIELD: medicine.

SUBSTANCE: line is drawn on a diagnostic stone model of an upper jaw along a median-sagittal suture R; a lateral median-papillary line MPT is drawn through the centre of an incisive papilla perpendicular to the median palatine suture R. The middle of a distal aproximal surface of the first premolars is marked D14 and D24. Perpendiculars are drops onto the line MPT to mark the points K14 and K24. The lines D14-K14 and D24-K24 are measured. A width of four upper incisors is measured. Their total is calculated to derive total incisor width, which is used to select a normal arch: variant 1 with total incisor width 26.0-28.0 mm; variant 2 with total incisor width 28.1-30.0 mm; variant 3 with total incisor width 30.1-32.0 mm; variant 4 with total incisor width 32.1 - 34.0 mm. The selected value is correlated to the normal distance Dnorm/Knorm to the line MPT according to the table. The actual distance D14-K14 and D24-K24 is compared to the normal distance Dnorm/Knorm of the first premolars, and a mesial occlusion value is defined as a difference thereof. A mesiodistal size of the first premolars is defined as a distance between the point D and point M in the middle of the mesial aproximal surface of the first premolar, and if the mesial occlusion of one or both premolars is 1/3 to 1/2 less than its mesiodistal size with underlying oral occlusion of one or both first premolars, the compensation by dental arch enlargement in the transversal plane with no extraction of teeth is preferred. If the mesial occlusion of one or both first premolars equal to or more than the mesiodistal size of the respective tooth, extraction of the first premolars and distalisation of the pointed teeth is selected. If the mesial occlusion of one or both first premolars is 1/2 to 2/3 less than the mesiodistal size of the respective tooth, with the normal tooth ratio in the transversal plane in relation to the median-sagittal suture, either second premolars, or third premolars are considered to be extracted.

EFFECT: method enables the accurate detection of the mesial occlusion of the side teeth and specifying the indications for the extraction of teeth or conducting the orthodontic treatment requiring no extraction, improving the quality and keeping with the length of orthodontic treatment.

4 dwg, 1 tbl, 3 ex