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Composite resin


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Composite resin

  1. 1. Composite o In materials and science, a solid formed from 2 or more distinct phases that have been combined to produce properties superior to or immediate to those of the individual constituents; also a term used in dentistry to describe a dental composite • Consists of at least two distinct phases normally formed by blending together components having different structures and properties. 2
  2. 2. Applications• Restoration for anterior and posterior teeth• Pits and fissure sealants• Bonding of ceramic veneers• Cementation of fixed prosthesis
  3. 3. components Matrix Filler Coupling AgentInitiators and accelerators pigments
  4. 4. Resin Matrix• Bis-GMA (bisphenol-A glyceril methacrylate)• UDMA (urethane dimethacylate)• TEGDMA (triethylene glycol dimethacrylate) If the composite is made up of just the resin matrix, it is called Unfilled Resin
  5. 5. Matrix• Phase that polymerizes to form a solid mass and that bonds to the tooth structure.• Weakest and the least wear resistant phase• Absorbs water, stain and discolor• Minimize the filler content• = stronger composite material
  6. 6. Filler Particles• Silica particles• Quartz• Glass ( Ba, Sr, Zr) If the composite is made up ofthe resin matrix AND fillers, it is called Filled Resin
  7. 7. Factors for durability of Co ResinFiller Size Filler Content• Determines the • As the filler content surface smoothness. increases, the resin• Larger particles = content decreases rougher surface • Hardness and• Composites are most abrasion resistance often classified by increases the filler size.
  8. 8. Filler Particles• Increase fillers, increase % Filler Volume mechanical properties 2 Fracture Toughness – strength 1.5 – abrasion resistance 1 – esthetics 0.5 – handling 0 0 28 37 48 53 62 Ferracane J Dent Res 1995
  9. 9. Coupling Agent • Chemical bond – filler particle - resin matrix • transfers stresses • Organosilane (bifunctional molecule) – siloxane end bonds to hydroxyl groups on filler – methacrylate end polymerizes with resin CH2 OHBis-GMA CH3-C-C-O-CH2-CH2-CH2-Si-OH Bonds with resin Bonds with filler O OH Silane Phillip’s Science of Dental Materials 2003
  10. 10. Coupling Agents• Chemical bond – filler particle - resin matrix• Improves physical and mechanical properties• Inhibits leaching by preventing water from penetrating along the resin-filler interface
  11. 11. Optical Modifiers / Pigments• Provides the opacity or translucency needed to make the composites similar to the natural tooth tissue• Metal oxide particles – Titanium dioxide – Aluminum oxide
  12. 12. Color Determination• Should be as close to that of the natural tooth as possible.
  13. 13. POLYMERIZATION SYSTEMS • Chemical Cure • Light cure • Dual cure
  14. 14. Polymerization Systemsa. Chemically Activated Materials - 2 paste systems 1. tertiary amine 2. BPO initiator - mix at chairside until 2 colors blend
  15. 15. • B. Light activated Materials- Single paste- Materials set when exposed to a very bright light.- Light sources:- Halogen light- Plasma arc light- Argon laser- Blue emitting diodes
  16. 16. • B. Light activated Materials• SYRINGE single paste• Free radical initiating system consist of• Photointiator molecule and amine activator• Light exposure ( correct wavelength)• Photoinitiator : camphorquinone• Amine Accelarator : DEAEMA ( diethyl- amino-ethyl-methacrylate)
  17. 17. • C. Dual Cure• Consists of 2 light curable pastes• BPO and aromatic tertiary amine• Light curing – promoted by amine/CQ combination• Chemical- amine/BPO interaction• APPLICATION:• Cementation of bulky ceramic inlays
  20. 20. Macrofilled Composites• conventional composites,• traditional composites• Properties: – Filler is quartz – Filler used: finely ground amorphous silica and quartz – Filler loading: 70-80 wt% or 60-70 vol%• May be used as a restoration in stress bearing areas such as Class IV and II sites
  21. 21. Macrofilled Composites • Clinical Considerations: – Produces a rough surface during abrasive wear – Finishing of the restoration also produces a roughened surface – Tend to discolor over time – Poor resistance to occlusal wear
  22. 22. Small Particle• To improve surface smoothness and retain or improve the properties of traditional composites.• High filler loading than traditional• Filler: amorphous silica , incorporate glasses• Compressive strength > macro and micro• Tencile strength : x2 micro and 1.5x macro• INDICATIONS:• high stress and abrasion prone (cl IV)
  23. 23. Microfilled Composites• Properties: – Filler used: colloidal silica – Filler size: 0.04 um colloidal silica(200-300 times smaller than the ave particle size of traditional composites) – Filler loading: 80 wt%, 60 vol%• Polish very smooth• Appearance like enamel
  24. 24. Microfilled Composites• Clinical considerations: – Bond between the composite particles and the matrix is relatively weak, making it not suitable for use as stress bearing restoration – Produces the smoothest finish – Indicated for: Class III and Class V cavities
  25. 25. Hybrid Composites• Properties: – Filler used: colloidal silica AND glass containing heavy metals – Filler size: 0.4- 1um – Filler loading: 75-80 wt%• Physical and mechanical properties rane between those of the traditional and SPF composites
  26. 26. Hybrid Composites• Clinical considerations: – Indicated for Class III and IV cases – Indicated for Class I and II cases – Indicated for Class V cases
  27. 27. Special Use Composite Materials • Flowable • Condensable / Packable
  28. 28. Flowable Composites• Has a reduced filler content to make the material “flowable”• Indicated for Class I restorations in the gingival areas• Used as a cavity base or liner especially for Class II preparations wherein access is difficult to achieve• Used as a pit and fissure sealant
  29. 29. Condensable composite• Has a filler particle that inhibits the filler particles by sliding to one another• Stiffer, thicker feel
  30. 30. Classification of Resin-Based Composites and Indications for Use