A kind of dental composite core resin and preparation method thereof

Abstract

The invention discloses compound nuclear resin for the dental department. The compound nuclear resin is mainly prepared from raw materials as follows: 0.005%-1% of modified nano diamond, 1%-10% of modified nanosilica, 25%-45% of quartz powder, 1%-5% of nano zirconium dioxide, 0.02%-0.2% of a coloring agent and 30%-60% of a resin matrix. Besides, the invention provides a corresponding preparation method of the compound nuclear resin. The modified nano diamond is added to the resin, the nano diamond has no biological toxicity and has no toxic or side effect on human bodies, the proper amount ofadded modified nano diamond can effectively improve the compressive strength and flexural strength of the nuclear resin, reduce the wear rate of the nuclear resin and improve the microhardness of thenuclear resin, and the clinical adhesion strength requirements for dental defect can be met.

Description

technical field [0001] The invention relates to the technical field of dental restoration, in particular to a dental composite core resin and a preparation method thereof. Background technique [0002] With the improvement of the preservation technology of the residual root and crown of the tooth, the teeth that were thought to need to be extracted in the past can be preserved and repaired. In the process of preserving the residual root and crown, the construction of the post core is a very important step. In recent years, with the development and wide application of prefabricated pile systems, people have paid more and more attention to the selection of nuclear materials. At present, clinically commonly used nuclear materials include silver amalgam, glass ionomer, composite resin, etc. Compared with the other two materials, composite resin shows more excellent comprehensive properties, such as aesthetics and biocompatibility , mechanical properties and ease of operation. ...

AI Technical Summary

Problems solved by technology

At present, inorganic fillers can be divided into three categories according to particle size. One is traditional fillers with a particle size of 1 to 100 μm, such as quartz, glass powder, silicate, ceramic powder, etc. These fillers have large particles; the second category is mixed fillers. , which contains both traditional large particles and a certain amount of ultrafine fillers, which improves the heterogeneity between large particle fillers and organic matrix, and provides suitable viscosity; the third category is ultrafine fillers, such as Silica with a particle size of 0.04 μm, these composite resins added with conventional inorganic fillers also show their shortcomings in clinical use, such as rough surface, easy fatigue, insufficient mechanical strength, low strength, poor wear resistance, polymerization Large shrinkage, high water absorption value, large thermal expansion coefficient, etc.

Due to the large particle size of the filler particles in traditional composite resins, there is a big difference between the hardness of the filler and the hardness of the resin matrix. In addition, the visibility of the particle height makes it difficult to maintain a smooth plane. , chewing force, food, etc., make the resin matrix around the filler particles wear away rapidly, the filler protrudes or falls off, forming a rough surface, creating conditions for staining and plaque accumulation, which is not conducive to dental health

Although the mixed filler type resin improves the heterogeneity between the inorganic large particle filler and the organic matrix, and improves the strength and hardness, it cannot produce the ideal anterior tooth restoration effect, because it contains large particles inside, even the restoration Sanded smooth, can also get rough after a while with staining and plaque buildup

Due to the extremely small particle size of the filler, the ultra-fine filler type composite resin is worn away at the same time as the resin matrix, which improves the wear resistance to a certain extent, but due to the small particle size and large specific surface area of ​​the filler, it has a strong thickening effect when directly mixed with the resin. The effect limits the ratio of filler to resin matrix, so that the ratio of filler decreases correspondingly, and the volume shrinkage coefficient, thermal expansion coefficient, water absorption rate, etc. increase correspondingly.

Images