Application of fine resin in dental materials
Dental caries is an important factor affecting oral health. What are the advantages of heat cure dentistry base resin as a new type of dental material?
caries
As the saying goes, a toothache is not a disease, it hurts really badly. In addition to inflammation of the gums, dental caries is also a key cause of toothache. It is caused by a combination of sugary foods and bacteria that live in the mouth and is an infection. Dental caries mainly occurs in young people. Although it has been controlled in the past ten years, it still has a younger trend.
The effective way to treat caries is to remove the diseased tissue and fill it. In 1875, Dr G.V. Black first explained the whole treatment process of dental caries. First, remove the diseased tissue, protect the pulp and healthy teeth, establish a good retention and resistance shape, and finally use the filling material to reconstruct the tooth structure.
Commonly used dental materials
At present, the commonly used dental filling materials are resins and alloys. These filling materials can complete the tooth structure and restore tooth function. It is best to have a certain degree of biocompatibility, good corrosion resistance, stable performance, and will not damage the oral tissue and cause health problems.
(1) composite resin artificial teeth
This filler is composed of a series of organic polymers and inorganic substances. It is a thermosetting resin. It is mainly used for anterior teeth. It is called tooth-coloured material. There are almost no traces of repair. The advantage is that the preparation of the teeth is more secure (reduced drilling volume), which increases the strength of the teeth, looks beautiful, and truly integrates with the teeth. The disadvantage is that individual patients will experience postoperative soreness, eating and stuffing their teeth, easily forming filling overhangs, and micro-leakage problems.
composite resin artificial teeth
This is the main part of the light-cured composite resin and has a decisive influence on the final properties of the material. Its main function is to adhere the components together, giving it plasticity, curability and a certain strength. The organic monomer used as the resin matrix should meet the requirements of small volume change in the polymerization process, fast light curing speed, low water absorption, high polymer strength, stable colour, and no harm to human health.
Currently, commonly used resin matrices are bisphenol A-glycidyl methacrylate (Bis-GMA), urethane dimethacrylate (UDMA) and triethylene glycol dimethacrylate (TEGDMA).
Among them, Bis-GMA has a high relative molecular mass and contains a rigid bisphenol A structure. When polymerized after being irradiated by light, it can quickly form a highly cross-linked network structure. It is usually diluted with low viscosity TEGDMA and is widely used. for dental fillings.
Inorganic fillers and photoinitiators
In addition to the resin matrix, inorganic fillers and initiators need to be added to the resin filler, and the filling can be completed after curing. The main inorganic fillers and initiators are as follows
fillers for dental fillings
Type of filler | details | main effect |
Inorganic filler | Glass, ceramics, quartz, and barium aluminosilicate, impart good mechanical properties to materials, reduce aggregation | Endow materials with good mechanical properties, reduce polymerization shrinkage, adjust viscosity, improve refractive properties, etc. |
surface treatment agent | Organosilane coupling agents, such as methacryloxypropyltrimethoxysilane (KH-570) | Improve the bonding force of inorganic fillers and resins |
Initiators for dental fillings
Type of initiator | details | main effect |
photoinitiator | camphorquinone (CQ) | It has the maximum absorption rate at the light wavelength of 470 nm, which is harmless to the human body |
co-initiator | dimethylaminoethyl methacrylate (DMAEMA) | Lowering the Decomposition Temperature of Initiators: Adjusting the Photocuring Rate |
Various raw materials will have an effect on the effect of the resin filling material. One table to understand the impact of raw materials on the performance of the resin.
Influencing factors | final performance | |
Inorganic filler | smaller particles | Polishing performance, good aesthetic effect, wear resistance |
high content | Good physical properties, wear resistance, small polymerization shrinkage | |
resin matrix | increase in the degree of aggregation | Increased hardness and strength |
Incomplete curing | Bacteria growth, allergic reactions | |
Residual functional groups | Decreases mechanical properties, causing swelling | |
Good refractive index matching of inorganic filler resin matrix | increase in the degree of aggregation | |
volume shrinkage | Micro crevices breed fine south, secondary caries |
Heat cure denture base resin is a popular dental restoration material, but its low wear resistance and high polymerization shrinkage limit its application. It is necessary to develop a resin matrix with properties such as high reactivity, high conversion rate and low polymerization shrinkage, find new fillers, and improve the properties of materials by changing the particle size, particle size distribution or structural morphology of the filler.
New Century Dental Materials specializes in multi-colour synthetic resin teeth, denture base resins, and dental waxes. Taking "professionalism, integrity, gratitude, and earnestness" as the company's code of conduct, taking the development of the dental business and improving the industry level as the responsibility, and devoting to the cultivation of the core competitiveness of the company, while strengthening the old products, the new Added dental resin, dental crown zinc, zink oxide eugenol and dental auxiliary materials, such as separating agent, grinding wheel and other high-quality products.