Today, let's talk about the resin we often use;
The composite resin is composed of organic resin matrix (dimethacrylate) and inorganic filler (amorphous SiO2, glass powder, prepolymer, etc.).
Performance:? Polymerization shrinkage: subminiature & gt; hybrid & gt; subminiature
? wear resistance: Slim & gt; hybrid & gt; subminiature
? burnable: ultra micro & gt; hybrid, widely used in aesthetic restoration of anterior teeth.
A composite resin is composed of three different components:
Matrix (the main function is to reduce and control the viscosity of resin material),
Fillers (reinforced fillers are dispersed in the matrix in the form of filaments or fiber particles, strengthening and improving the physical properties of the resin matrix.) ,
Coupling agent (as the "treatment agent" of modern binder system, it is beneficial to improve the mechanical cohesion of resin matrix)
1. Composite resin for anterior teeth
Most of them are composite resins of ultra-fine filler type and nano filler type. The amount of packing can reach 60% of the total weight
2. Composite resin for posterior teeth
Most of them are composite resins with high filler content and mixed filler. The amount of packing can reach 88% of the total weight.
3. General composite resin
It is a composite resin of mixed packing type, and the packing content can reach 80% of the total weight. The general composite resin recommended by the manufacturer can be used for anterior teeth and posterior teeth, but it should be used with caution when the bite force of posterior teeth is too heavy.
Key points of composite resin
(1) Incomplete polymerization: it is a potential allergen.
Avoid methods: clean the irradiating head before use, reduce the irradiating distance as much as possible when placing, fill in layers (& lt; 2mm), light time (20s ~ 40s), multi angle irradiating, transparent equipment (transparent molding piece), etc.
(2) Polymerization shrinkage:
Shrink toward the light source.
Reduction method: the binder and the first layer resin are cured by low intensity light, and the initial layer resin should not be too thick. The flowing resin can be used as the lining to form the elastic cavity wall; the layered oblique filling technology can reduce the C factor (the ratio of the bonded area and the non bonded area).
Commonly used clinical resins:
（1） Yihuojia resin
1. Tetric? N-ceram universal filling resin for anterior and posterior teeth
The compressive strength is between 300-475mpa, and the particle size of inorganic filler is between 40-3000nm
Good effect of polishing chameleon with high X-ray occlusion
2. Bulk fill
（2） Kerr composite resin
1. Premisa is only used for posterior teeth
High strength (triple packing system), ultra-low shrinkage, strong operability and easy polishing
2. Common to the front and rear teeth of the amber (herculite)
Perfect match with Vita palette
High gloss retention and chameleon effect
（3） 3M resin
1.Z350XT
The strength of universal nano resin for front and rear teeth is about 300mpa,
The filler is zirconia / silica
2. Flow resin
Low concentration, visible light activated, X-ray impermeable mobile nano resin
The average size of agglomerates is 600-10000nm
3. P60 for posterior teeth
Small polymerization shrinkage, good wear resistance, and filling operation feel
（4） Micerium composite resin
The proportion of inorganic filler is 80%, and the hardness is 700MPa
·Dentin resin (ud1-6)
·Enamel resin (ue1-3)
·Reinforced resin (IM IW)
·Opalescent resin (OA, OBN, og, ow)
·Dye Resin
(white dye, yellow dye, brown dye 1, brown dye 2, orange dye, blue dye)
Fluid resin (ud1-6)
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