Preparation method of multicomponent composite materials used for single paste type cavity filling

Abstract

The invention relates to a preparation method of multicomponent composite materials used for single paste type cavity filling, belonging to the field of preparation for dental use. The technical proposal aims at solving the problem that current dental composite resin materials used for cavity filling urgently need to be further improved in the aspects of 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 monomers such as bisphenol A glycidyl methacrylate, thinners such as triethylene- glycol dimethacrylate, light initiators such as camphorquinone, coinitiators such as dimethylamino ethyl methacrylate and the like in the absence of light; bubbles are eliminated in vacuum. The technical proposal has the key point that the inorganic nano powder contains short-rod like nano-particle hydroxyapatite accounting for 10-80% of the inorganic nano powder by weight. The short-rod like nano-particle hydroxyapatite added in the multicomponent composite materials helps to improve the wear-resisting properties and toughness of the materials.

Description

technical field [0001] The invention relates to a method for preparing a single-paste multi-component composite material for caries cavity filling, which belongs to the field of A61K medical and dental preparations. Background technique [0002] The incidence of caries in various countries in the world is still at a relatively high level in recent years, and caries filling materials are being used in large quantities in caries medical work. Based on this reality, in order to further reduce the pain of patients and reduce medical costs, increase The reliability and durability of caries filling materials, in-depth research and development of such materials has practical significance. Due to its high mechanical strength, thermal expansion coefficient similar to that of teeth, good polishing performance, insoluble in saliva, and similar color and luster to teeth, dental composite resins are currently being gradually promoted and used in the restoration and filling of caries. Ho...

AI Technical Summary

Problems solved by technology

[0004] Among the components of dental composite resins, the inorganic fillers added to increase strength and wear resistance mostly use amorphous particles. The role of amorphous particles in composite resins is similar to that of spherical particles. 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 body of dental composite resin after curing, the contribution of amorphous particles to the strengthening and toughening of dental composite resin is also somewhat lacking due to the failure to fully take into account the pull-out toughening mechanism.

[0005] In order to make full use of the pull-out toughening mechanism to strengthen dental composite resins, in recent years, glass fibers with high aspect ratios, silicon carbide whiskers, silicon nitride whiskers, and aluminum borate whiskers have been considered as inorganic materials. Fillers have attracted the attention of some researchers. Undoubtedly, if this type of inorganic filler with a high aspect ratio can be uniformly mixed into the resin, it will provide a positive benefit to the strengthening and toughening of dental composite resins. However, the long-diameter Glass fibers with high ratio, silicon carbide whiskers, silicon nitride whiskers, and aluminum borate whiskers are difficult to mix evenly into the resin matrix due to their inherent physical shape. In other words, uniform mixing becomes an insurmountable Obstacles, this factor makes the application of inorganic materials such as glass fibers with high aspect ratio, silicon carbide whiskers, silicon nitride whiskers and aluminum borate whiskers in dental composite resins not fully and comprehensively displayed. , this is especially evident in the field of dental composite resin materials for caries filling