METHOD FOR RESTORING CONTACT POINT OF MOLARS AND PREMOLARS LOST DUE TO CARIOUS PROCESS Russian patent published in 2025 - IPC A61C5/00 

FIELD: medical science.

SUBSTANCE: invention relates to the field of medicine and is intended for use in the restoration of a tooth contact point. At the preparatory stage, the presence or absence of dystopia of the affected teeth is determined and casts of the embrasures of the affected interdental contact are made. At the second stage, the size of the cavity of the involved teeth is determined within the area of the contact point, and the cavities are characterized. If the cavity is within the region of the contact point and above the level of the gingival papilla, it is determined as type I; if the cavity extends beyond the contact point and is above the level of the gingival papilla, it is determined as type II; if the cavity is within the region of the contact point and below the level of the gingival papilla, it is determined as type III; if the cavity extends beyond the contact point and below the level of the gum papilla, type IV is stated. At that, cavities of I-III type, in which the area of tooth contact with the side surfaces of the separation ring exceeds 50% of these surfaces total area, are classified as small, and cavity of IV type, which is characterized by area of contact of tooth with side surfaces of separation ring of less than 50% of total area of side surfaces, is defined as large. At the third stage, the matrix system is installed and the contact point is prepared for restoration, wherein in the absence of tooth dystopia for small and large cavities, the matrix system is installed so that the matrix is not exposed to pressure, and installing a dental wedge in the gingival arch area, checking the quality of the matrix adjacency to the gingival wall of the cavity, if a gap is found between the affected tooth and the matrix, the dental wedge is removed for its modification or selection of a suitable wedge size and then using the separation ring ensuring the matrix immovability. In the presence of dystopia of the affected teeth for small cavities, the immobility of the separation ring, casts of the embrasures and the matrix is provided by placing on the outside between the cast and the ring of a polymerised material based on polymeric resins, in the presence of dystopia of the affected teeth for large cavities, before setting the matrix, the contour of the tooth is restored, namely the lost vestibular-approximal and oral-approximal contours, without approaching the approximal region of the tooth using casts of embrasures, holding them with tweezers or a finger, then, immobility of separation ring, castings of embrasures and female die is ensured by placing polymerized material based on polymer resins between cast and ring. At the fourth stage, the approximal wall of the tooth is restored and the contact point is created, in case of small cavities, a fluid dental filling material is introduced on the border of the matrix and the tooth cavity from the side of the tooth cavity, polymerising the material and laying the formed approximal wall to the level of the marginal ridges of the tooth with subsequent restoration, according to the clinical recommendations for large cavities after the fluid dental filling material is introduced, pressure is applied to the border of the matrix and the tooth cavity from the side of the tooth cavity, material is polymerised in a projection of the tooth contact point to be restored; a portion of dental paste material is applied, and the formed approximal wall is laid to the level of a point of contact with an adjacent tooth to be restored in accordance with clinical recommendations. In the absence of tooth dystopia for small and large cavities, the dental wedge is modified by placing a sterile Teflon tape or polished dental floss on the wedge or by crimping it in front and backward from the invagination projection.

EFFECT: by using a certain sequence and instruments depending on the cavity size and tooth position, the method enables restoring the contact point of the tooth taking into account its anatomical and pathological features, providing higher effectiveness of the dental treatment.

2 cl, 8 dwg, 2 ex