Tooth filling and repairing material and preparation method thereof

Abstract

The invention discloses a tooth filling and repairing material and a preparation method thereof, and belongs to the technical field of tooth materials. The tooth filling and repairing material includes a resin matrix, an adjuvant, a filler, and pre-polymerized resin powder. The pre-polymerized resin powder is formed by polymerization of Bis GMA (bisphenol A diglycidyl methacrylate). The preparation method of the tooth filling and repairing material comprises the following steps: preparation of the pre-polymerized resin powder, mixing of the resin matrix and the adjuvant, mixing of a mixture Aand the filler, and mixing of a mixture B and the pre-polymerized resin powder. The tooth filling and repairing material prepared by the method has bending strength of 80-120 MPa after curing, compressive strength of 200-300 MPa and shrinkage rate of 1.3-2%. Compared with the prior art, the tooth filling and repairing material has good comprehensive mechanical properties and low shrinkage rate, and is suitable for industrial mass production.

Description

technical field [0001] The invention belongs to the technical field of tooth materials, and in particular relates to a tooth filling restoration material and a preparation method thereof. Background technique [0002] 1. About the condition of the teeth [0003] 1.1 Dental diseases [0004] With the changes in the lifestyle of human society and the aging of the social population, the incidence of tooth erosion in adolescents and tooth and face caries in the elderly is increasing year by year. At present, the incidence rate of tooth erosion among teenagers is as high as 60%. Epidemiological investigations show that the incidence rate of a certain university population in Beijing is 45.8%. According to the third national oral health epidemiological survey report, the caries rate of 65-74-year-old people in my country is 98.4%, and the root caries rate is as high as 63.6%. The further development of these two types of dental hard tissue diseases will lead to pulp inflammatio...

AI Technical Summary

Problems solved by technology

[0011] The current composite resin products still have certain deficiencies: 1) There is volume shrinkage during the curing of the composite resin monomer, which may not fit tightly with the cavity wall, resulting in microleakage or secondary caries; 2) The loss of anatomical form due to material wear still remains It is a common problem in composite resin restorations; 3) There is still a certain difference between the optical refractive index of composite resin and human teeth, resulting in a visible dividing line between the restoration material and the tooth interface, which affects the appearance

The inorganic fillers in existing composite resins are generally quartz fillers, which have a large contact angle with water, low water absorption reduces micro-leakage, and have strong surface pollution resistance, but relatively poor physical and mechanical properties

At the same time, the composite resin has a certain degree of polymerization shrinkage, and the polymerization shrinkage of the composite resin seriously damages the edge seal of the restoration and causes the bonding of the tooth restoration interface to be damaged.

There are also many limitations in the existing preparation methods, such as: the process is too complicated, the cycle is long, and the operability is poor

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