Preparation method of light-cured materials for teeth

Abstract

The invention relates to a preparation method of light-cured materials for teeth, belonging to the field of preparation for medical and dental use. The technical proposal aims at solving the problem that current light-cured dental composite resin materials used for cavity filling are poor in wear-resisting properties and toughness. The method comprises the following steps: silane coupling agent is adopted to carry out surface modification on inorganic nano powder; the modified inorganic nano powder is evenly mixed with relevant monomers, thinners, light initiators, coinitiators and the like in dark places; bubbles are eliminated under vacuum. The technical proposal has the key point that the inorganic nano powder contains flaky silica particles accounting for 10-80% of the inorganic nano powder by weight; the width of the flaky silica particles fluctuates between 0.3 micron and 36.0 microns and the ratio of the width to the thickness of the flaky silica particles is between 3 and 40. The flaky silica particles added in the light-cured materials conduce to improving the wear-resisting properties and toughness of the light-cured materials.

Description

Technical field [0001] The invention relates to a preparation method of a dental light-curing material, which belongs to the field of A61K medical and dental preparations. Background technique [0002] my country's dental caries patients account for more than half of the country's population. According to estimates by relevant scholars, every caries patient has an average of two caries, and my country has 1.3 billion caries to be filled and repaired, and a large amount of dental filling materials are needed. Silver amalgam is an alloy synthesized by grinding mercury and silver alloy powder. It is the most widely used filling material in dentistry. However, due to its inherent shortcomings, it is very demanding to fill the adjacent surface of the posterior tooth with silver amalgam. Strict, to make the bottom straight, the point line angle is clear, which increases the loss of tooth tissue, but also aggravates the stimulation of the dental pulp; amalgam is a good conductor of heat...

AI Technical Summary

Problems solved by technology

[0004] In the components of light-cured dental composite resins, the inorganic fillers added to increase strength and wear resistance mostly use amorphous particles, which can play a role similar to spherical particles in composite resins. In the surface layer of dental composite resin, the bonding surface between the amorphous particles and the resin matrix is ​​small, the anchoring force is weak, and it is easy to peel off during the friction process. This factor makes the amorphous particles play an important role in improving the wear resistance of dental composite resins. On the other hand, in the cured dental composite resin body, the shape of the amorphous particles is roughly approximate to a spherical shape, and the contribution to the strengthening and toughening of the light-cured dental composite resin is not fully considered. There are some deficiencies in pulling out the toughening mechanism

[0005] In order to make full use of the pull-out toughening mechanism to strengthen light-cured dental composite resins, in recent years, glass fibers with high aspect ratios, silicon carbide whiskers, silicon nitride whiskers, and aluminum borate whiskers are worth considering. The inorganic fillers have attracted the attention of some R&D personnel. Undoubtedly, if this kind of inorganic fillers with high aspect ratio can be uniformly mixed into the resin, it will provide a positive benefit to the strengthening and toughening of light-cured dental composite resins. However, glass fibers with high aspect ratios, silicon carbide whiskers, silicon nitride whiskers, and aluminum borate whiskers are difficult to mix evenly into the resin matrix due to their inherent physical appearance. In other words, uniform mixing becomes An insurmountable obstacle, this factor has prevented the application of inorganic materials such as glass fibers with high aspect ratios, silicon carbide whiskers, silicon nitride whiskers, and aluminum borate whiskers in light-curing dental composite resins. Full and comprehensive application, which is especially evident in the field of light-curing dental composite resin materials for cavity filling