METHOD FOR DETERMINING THE CT DENSITOMETRIC DENSITY OF HARD TISSUES OF THE GINGIVAL REGION OF TEETH Russian patent published in 2022 - IPC A61B6/00 

FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely, to dentistry, and is intended for use when determining the degree of maturation and mineralisation of enamel and dentin. Computed tomography is performed on the Planmeca apparatus, followed by computer processing of the resulting image in the Planmeca romexis viewer software, wherein regression lines are determined, said lines constituting criteria for identifying patients with low CT densitometric density and low level of maturation and mineralisation of hard tissues of teeth. The simple linear regression line is calculated by binary regression using the equation y=α+βx, wherein y is the value expected for y if the value x is known, called the predicted y value; x is called an independent, predictor, or cause variable; α is the free term (intersection) of the estimation line, being the value of y when x=0; β is the angular coefficient, or gradient of the estimation line, constituting the magnitude of average increase of y if x increases by one. If the value of CT densitometric density is from 1,890 to 2,280 HU, a conclusion is made that the CT densitometric density of hard tissues of the tooth in the gingival region is high, thus indicating dense packing of the mineral component and a high degree of maturation and mineralisation of hard tissues of the teeth. If the value is from 1,685 to 1,889 HU, a conclusion is made that the CT densitometric density of hard tissues of the tooth in the gingival region is average, thus also indicating dense packing of the mineral component and a good level of maturation and mineralisation of hard tissues of the teeth. If the value is from 1,325 to 1,684 HU, a conclusion is made that the CT densitometric density of hard tissues of the tooth in the gingival region is, packing of the mineral component is weak and chaotic, and the level of maturation and mineralisation of hard tissues of the teeth is low as is characteristic of odontogenesis imperfecta; if the value is from 1,005 to 1,324 HU, a conclusion is made that the CT densitometric density of hard tissues of the tooth in the gingival region is extremely low, packaging of the mineral component is extremely weak and chaotic, and the level of maturation and mineralisation of hard tissues of the teeth is extremely low as is characteristic of odontogenesis imperfecta.

EFFECT: due to the increase in the accuracy and objectivity of determining the degree of maturation and mineralisation of hard tissues of the tooth, method allows determining an unfavourable prognosis for the condition of the hard tissues of the teeth and prepare an individual treatment plan, if necessary.

1 cl, 2 ex