<br />Properties Composite Resins<br />By:<br...
Radiographic Properties:<br /><ul><li> On a radiograph, composites typically are radiopaque.
 Light gray when compared with dentin.
 Radiolucent--or dark--on a radiograph when compared with enamel.</li></li></ul><li>Thermal Properties:<br /><ul><li>It ha...
A higher thermal expansion than tooth. which means composites easily can change dimensions as temperature changes in the m...
Classification of composites:<br />Based on the filler particle size and distribution<br />1.  Megafill   very large fille...
Classification of composites:<br />Based on method of polymerization<br />1. Self cure, autocure composites<br />2. Light ...
1.Conventional composites:<br /><ul><li>75%-85 % by wt ,
  particle size is ~ 8 – 12 µm
Filler –     quartz, barium, strontium
Upcoming SlideShare
Loading in …5
×

Ahmed al fawzan

711 views
634 views

Published on

0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
711
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
0
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Ahmed al fawzan

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

×