| Physical and Chemical Properties | The chemical properties are single paste components and do not need to be stirred when used. Color and transparency are similar to natural teeth, chemically stable and stable in color. Excellent performance, good polishing and surface finish, viscous colloid appearance, relative density of (25 ℃) 1.17. |
| Use | The application is a new dental material, which is an ideal cosmetic dental material for the treatment of anterior tooth defect, enamel hypoplasia, tetracycline teeth, dental fluorosis, dead pulp teeth and other colored teeth. |
Synthesis of matrix: In a three-mouth bottle equipped with a stirrer, a reflux condenser, and a thermometer, add epoxy compounds, excess methyl methacrylate, catalyst and stabilizer, and react at 60-80 ℃ until the conversion rate of epoxy groups is greater than 98%. The reaction is terminated, and the Bis-GMA resin is obtained after washing and refining.
Preparation of BIS-GMA-MA resin: In the reactor, an epoxy compound is added, and a modifier is added to reduce the water content of the methacryloyl oxide group and improve the molecular weight of the resin.
Synthesis of monomer butylene dimethacrylate: In a three-mouth bottle equipped with a stirrer, a reflux condenser, and a thermometer, 1, 4-butanediol, methacrylic acid, a catalyst, a stabilizer and a solvent are added for the reaction. After the reaction is terminated, neutralization, water washing, and distillation are carried out to obtain a yield of 50%-55%.
Preparation of microfillers: silica is crushed and compounded to obtain microfillers, which are then impregnated with 1% methylenoyloxypropyl trimethoxysilane in ethanol solution for 15min, and activated at 120 ℃ for 2h after suction filtration.
Preparation of composite resin: according to the formula, the resin and the monomer are mixed at 30-40 ℃, the photoinitiator and reducing agent are added to continue the reaction, then the filler is added, after the mixture is uniform and the pigment needs to be added for color matching, and finally placed in the mixer Pressurized or vacuum exhaust.
Preparation of adhesive: according to the formula, the resin and monomer are mixed at 30-40 ℃, then the ternary composite photoinitiator system is added, and the mixture is uniform.
Acid treatment agent: distilled water: zinc oxide: phosphoric acid = 43:7:50.
According to the above ratio, the components are mixed evenly, and then thickener is added to form a colloidal liquid.