Presentation on theme: "Composite Resin Material"— Presentation transcript:
1 Composite Resin Material Part 1Dr. Nesrien Ateyah
2 History Ideal esthetic material for conservative restorations has resulted in improvementsin materials and techniques. To improve the physical characteristics ofthe esthetic materials, they develop apolymeric dental restorative materialreinforced with silica particles (1962)generally termed composites.
3 Composites are presently the most popular tooth-colored materials and with acid etch technique (1952) represent major advances.
4 Composition Inorganic filler Organic resin matrix Filled (composite) resin restorative materials are all basically two-phase systems.Dispersed phase of Continuous phasehigh strength of polymericceramic particles matrixInorganic filler Organic resin matrixSilane coupling agent
6 Reduce the polymerization shrinkage. Inorganic FillerReduce the polymerization shrinkage.Reduce the coefficient of thermal expansion.Provide higher strength , stiffness , FX. resistance thermal dimension change.
7 Translucency matching tooth structure. Chemical inert nessOpaque to x-ray to help making a post operative diagnosis (radiopacity).Most material contain percent filler by weight.
8 Organic Resin Matrix Mixing chemically reactive polymeric materials. After insertion continuous ductile phase to bind dispersed filler particles together.This ductile resin act as a medium to transfer the stress b/w the particles (prevent distortion of the material).The resin systems are highly cross-linked , aromatic dimethacrylates. (BisGMA) diluted with less viscous co monomers , Initiator.
9 Silane Coupling Agent wear resistance For a composite to have a good mechanical and physical properties, a strong bond must exist b/wOrganic resin Inorganic fillermatrixSilane coupling agent strength of composite solubility water absorptionSilane Coupling Agent wear resistance
10 Inorganic Filler Types of Composite Divided into 3 types based primarily onSize Amount CompositionInorganic Filler
11 Types of Composites (cont’n) Early composite containedLarge Large Micro fine Finespherical irregular particles particlesparticles [ m] [0.5-3 m][20-30m]Blends(hybrid)
12 Types of Composites (cont’n) 1. Conventional2. Micro fill Composites3. Hybrid
13 Conventional Composites Contain 75 to 80 % inorganic filler by weight ( vol.) Particle size range from 1 to 10 m, with the average of 3 m.Uses:Class IV and II
14 extreme hardness of inorganic filler. Disadvantages: Because of the : large size and extreme hardness of inorganic filler.It exhibits a rough surface texture then surface discoloration higher initial wearBut they have good physical and mechanical properties.
15 Micro fill Composites: Designed to replace the rough surface characteristic of conventional composites with : smooth lustrous surfaceColloidal silica particles m instead of large filler particles.Results in smooth, polished surface respective to plaque or staining.
16 ( low modulus of elasticity ) Microfill Composites: (cont’n) They have 35 to 60% inorganic filler by wt., so it cannot be heavily filled, because of greater surface area per unit volume of this microfine particles ( vol.).Result in: inferior physical and mechanical propertiesHigher wear resistant clinicallyUses: ( Anterior rest class III , V )( low modulus of elasticity )
17 Hybrid Composites: Developed to combine the good physical and mechanical characteristics of conventional composites with the smooth surface of micro fill composites. These materials have 70 to 80 % by wt., inorganic filler content (50 – 65 vol.).
18 Conventional Micro fill particles Hybrid Composites: (cont’n)The filler is a mixtureConventional Micro fill particlesthat have a smaller average particle size than conventional composites [ m] and bigger than micro fill .
19 Hybrid Composites: (cont’ n) Due to the presence of sub-micron sized particles inter spread among the larger particles allows a smooth surface texture to be attained in the finished restoration. They have good physical and mechanical characteristics.Uses: ( Anterior, posterior, IV )
20 Advantages of Composites: The physical properties of the compositeresins are improved over those of certain otheresthetic materials.1) Solubility is not observed.2) Water sorption is lower3) Fluid exchange within the polymerdecreased, this will promoteChemically ColorStability
21 1) It has greater capacity to resist masticatory stress. Advantages: (cont’n) Mechanical properties of the filled resinalso enhanced.1) It has greater capacity to resist masticatory stress.2) Surface hardness is higher(resistance to indentation)
22 3) Stiffness is improved (resistance to distortion)4) Dimensional stability is improved.5)Initial shrinkage on polymerization is reduced to 1/4 (less leakage)
23 dimensional change during thermal cycling minimized Advantages: (cont’n)6) Thermal coefficient of expansions is decreased by 60% (3x tooth structure)clinically better adaptation to cavity walls and margins. dimensional change during thermal cycling minimizedresulting to less marginal leakage
24 7) Thermal conductivity is quite low Advantages: (cont’n)7) Thermal conductivity is quite low resin has capability to insulate from thermal change.
26 1- Less wear resistance in stress area. DisadvantagesOver Amalgam1- Less wear resistance in stress area.2- Technique sensitivity3- Higher coefficient of thermal expansion4- Low modulus of elasticity
27 Indications: Indications: 1) Anterior restoration ( III , IV, V, VI )2) Posterior restoration ( I , II ) 3) Diastema closure4) Preventive Resin Restoration5) Veneering6) FX. Of Anterior teethIndications:Indications:5) 4) FX. Of anterior teeth7) Inlay and Onlay
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