Hydrophobic resin adhesive, preparation method and application thereof

Abstract

The invention relates to a resin adhesive material with good hydrophobic performance, a preparation method and an application of the material in filling treatment of tooth hard tissue defects of mouth rehabilitation and belongs to the technical field of stomatological materials. The material is composed of a main component, a diluent and a photoinitiator, wherein the main component is a mixture of isocyanate terminated polyether triol and polyurethane dimethacrylate and accounts for 50-70%; the diluent comprises methyl methacrylate and butyl acrylate which respectively account for 10-20% and 19-27%; and the photoinitiator is a mixed initiation system composed of ethyl-4-dimethylamino ethyl benzoate and camphorquinone and accounts for 1-3%. The material provided by the invention does not contain hydroxyl, carboxyl, phosphate groups and sulfonic groups which are prone to absorb water and swell, has good hydrophobic performance, can effectively prevent infiltration and absorption of water molecules, and meanwhile further has good tensile strength; and the material effectively prevents micro-leakages after repair, so that occurrence of restoration breakage and secondary caries which are common clinically is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of stomatological materials, and in particular relates to a resin adhesive material with good hydrophobic properties, a preparation method and its application in the filling treatment of oral restoration of dental hard tissue defects. Background technique [0002] In 1955, Buonocore applied acid etching technology to dental bonding for the first time, and the bonding technology has developed rapidly since then. The first generation of adhesives appeared in 1956. In the following less than half a century, after continuous improvement, its bonding performance was gradually improved, and it was rapidly updated from the first generation to the seventh generation. From total acid etching to self-etching, its chemical composition, main technical theory and repair effect have changed a lot. At present, the adhesives widely used in clinical practice are the fifth-generation, sixth-generation and seventh-generation ...

AI Technical Summary

Problems solved by technology

Studies have shown that the instant bonding strength of the fourth to seventh generation adhesives can meet clinical needs, but it gradually reflects the problems of unsatisfactory bonding interface quality, poor water resistance, and poor durability.

[0003] In order to improve the bonding force between the adhesive and the tooth body, most of the current dentin adhesives contain a large amount of water-soluble monomers such as hydroxyethyl methacrylate and hydroxypropyl methacrylate, which are hydrophilic. After the adhesive is cured, it is still hydrophilic, and it is easy to absorb water from the surroundings, such as absorbing water from dentin and dentin tubules, forming a "water tree" water-containing structure in the adhesive layer of the bonding interface. These water-containing structures Is a structural defect, easy to become the initiation site of damage

With the expansion of water absorption, the molecular chain of the adhesive is gradually hydrolyzed and destroyed, and even the collagen fibers wrapped by the adhesive are hydrolyzed and destroyed. The bonding strength decreases with time, and the bonding interface is gradually destroyed. Eventually produce microleakage at the restoration margin leading to restoration failure

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