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Ahmed al fawzan
Ahmed al fawzan
Ahmed al fawzan
Ahmed al fawzan
Ahmed al fawzan
Ahmed al fawzan
Ahmed al fawzan
Ahmed al fawzan
Ahmed al fawzan
Ahmed al fawzan
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Ahmed al fawzan

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  • 1.                                                                              
    Properties Composite Resins
    By:
    Ahmed Al fawzan
  • 2. Radiographic Properties:
    • On a radiograph, composites typically are radiopaque.
    • 3. Light gray when compared with dentin.
    • 4. Radiolucent--or dark--on a radiograph when compared with enamel.
  • Thermal Properties:
    • It has a lower thermal conductivity than do metallic restorations. So, composites offer good thermal insulation for the dental pulp.
    • 5. A higher thermal expansion than tooth. which means composites easily can change dimensions as temperature changes in the mouth (leakage)
  • Classification of composites:
    Based on mean particle size of the filler:
    1 conventional composites
    2 small particle
    3 microfilled
    4 hybrid
  • 6. Classification of composites:
    Based on the filler particle size and distribution
    1. Megafill very large fillers
    2. Macrofill 10- 100 µm
    3. Midfill 1- 10 µm
    4. Minifill .1 – 1 µm
    5. Microfill .01 - .1 µm
    6. Nanofill .005 - .01 µm
  • 7. Classification of composites:
    Based on method of polymerization
    1. Self cure, autocure composites
    2. Light cured composites
    a. UV light cured
    b. Visible light cured
    3. Dual cured composites
  • 8. 1.Conventional composites:
    • 75%-85 % by wt ,
    • 9. particle size is ~ 8 – 12 µm
    • 10. Filler – quartz, barium, strontium
    • 11. Adv- good physical properties
    • 12. Disadv - rough surface texture
    - increased wear
    - susceptible to discoloration
  • 13. 2. Small particle size
    • ~ 80%wt
    • 14. particle size – 1-5 µm
    • 15. Filler- heavy metal glasses- lithium, barium, zirconium
    • 16. Adv - superior mechanical properties
    - increased wear resistance
    - low LCTE
    • Disadv- filler particles are softer and prone to hydrolysis
  • References:
    Craig’s Restorative Dental Materials John M.Powers (Author), Ronald L. Sakaguchi (Author)
    Sturdevant'sArt & Science of Operative Dentistry
  • 17. Thank you

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