A kind of resin composition of invisible orthodontic accessories without brackets
A resin composition and invisible orthodontic technology are applied in the field of dental materials to achieve the effects of good fluidity, increased Vickers hardness, and reduced polymerization shrinkage rate
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Embodiment 1
[0038] In this example, γ-methacryloxypropyltri-methoxysilane (3-methacryloxypropyltri-methoxysilane, hereinafter referred to as γ-MPS) was used as a silane coupling agent to conduct yttrium aluminum garnet (yttrium aluminum garnet, YAG) Modification, introducing C=C on its surface to improve the compatibility of organic and inorganic two phases.
[0039] Yttrium aluminum garnet YAG powder with an average particle size of 500nm was placed in an electric blast drying oven at 100°C and dried for 24 hours. Weigh 10g of dried YAG powder into a 1000mL round-bottomed flask, add 500ml of deionized water, use an ultrasonic machine to vibrate for 10min, then add 1.1ml of γ-methacryloxypropyltrimethoxysilane (γ-MPS) to the mixture , and then adjust the pH to 8.5 using ammonia water. Stir at room temperature with a constant temperature magnetic stirrer at 500r / min for 2h, retest the pH value, add ammonia water to adjust the pH to 8.5, raise the temperature of the oil bath to 100°C, and ...
Embodiment 2
[0045] (1) SiO 2 Modification of inorganic fillers: SiO with an average particle size of 1um 2 Dry the powder in an electric blast drying oven at 100°C for 24 hours, weigh 10g of dry SiO 2Put the powder in a 1L round bottom flask, add 500ml of deionized water, use an ultrasonic machine to sonicate, adjust the pH to 8.5 with ammonia water after 10 minutes, add 1.1ml of γ-methacryloxypropyltrimethoxysilane to the mixture, Stir at room temperature for 2 h with a constant temperature magnetic stirrer at a speed of 500 r / min. Then retest the pH and readjust the pH to 8.5 with ammonia water. Raise the temperature of the oil bath to 100° C., and continue stirring for 2 h with a constant temperature magnetic stirrer at a rotational speed of 500 r / min. The modified SiO was treated with a micro circulating water vacuum pump 2 Suction filtration to dryness, washing 3 times with water and 2 times with absolute ethanol alcohol to obtain the modified micron SiO 2 The powder was dried a...
Embodiment 3
[0051] This example investigates the effect of the YAG filler content on the properties of the composite resin prepared in Example 2. And choose the YAG resin with the best mechanical properties as the experimental group, with 75wt.% SiO 2 Control group, Filtek TM Z350XT (referred to as 3MZ350XT control group) conducts various performance comparison studies.
[0052] 1. Experimental method
[0053] Each group of composite resins that embodiment 2 makes is carried out mechanical property test, and concrete test item is as follows:
[0054] (1) Preparation and testing of three-point bending specimens: according to the ISO 4049:2009 standard, put the above-prepared resin samples into a stainless steel rectangular mold with a size of 2mm×2mm×25mm, and fill them vertically with cement filler , use a light curing lamp to cure the front and back sides for 40 seconds respectively, and use 500-grit sandpaper to polish after demoulding (sandpaper: Changzhou Jinniu Grinding Co., Ltd....
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