Ar laser

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Ar laser

  1. 1. : LASER •• Light Amplification by Stimulated Emission of Radiation •
  2. 2.
  3. 3. ••
  4. 4.
  5. 5.
  6. 6. •light amplification
  7. 7. •. •stimulated emission
  8. 8. • monochromatic –coherent – directional –
  9. 9. Ruby Laser •
  10. 10. Ruby Laser
  11. 11. Ruby Laser
  12. 12. Ruby Laser
  13. 13. Ruby Laser
  14. 14. Ruby Laser
  15. 15. Ruby Laser
  16. 16. solid-state laser • ruby neodymium:yttrium-aluminum TAG Gas laser •
  17. 17. Excimer laser • Dye laser •rhodamine 6G Semiconductor • laser
  18. 18. (nm) 193 Argon fluoride (UV) 248 Krypton fluoride (UV) 308 Xenon chloride (UV) 337 Nitrogen (UV) 488 Argon (blue) 514 Argon (green) 543 Helium neon (green) 633 Helium neon (red) 570-650 Rhodamine 6G dye (tunable) 694 Ruby (CrAlO3) (red) 1064 Nd:Yag (NIR) 10600 Carbon dioxide (FIR)
  19. 19. • – –- – - –
  20. 20. • CO2 •- (
  21. 21. •-. - : . – . – . – ). ( – ( – ). . – . – . – . – •
  22. 22. •- - - - • – -… –
  23. 23. ••••••••
  24. 24. • Erbium Laser Neodymium LaserDeodymium LaserCO2 laser Helium laser
  25. 25. Erbium Laser • • • •
  26. 26. • – – –smear layer – –
  27. 27. NeodymiumLaser • •
  28. 28. Deodymium Laser • • •
  29. 29. CO2 laser • •
  30. 30. Helium laser •
  31. 31.
  32. 32.
  33. 33.
  34. 34.
  35. 35.
  36. 36.
  37. 37. ••
  38. 38.
  39. 39. Laser Pros• Compared to the traditional dental drill, lasers: – May cause less pain in some instances, therefore, reducing the need for anesthesia – May reduce anxiety in patients uncomfortable with the use of the dental drill – Minimize bleeding and swelling during soft tissue treatments – May preserve more healthy tooth during cavity removal
  40. 40. Laser Cons• The disadvantages of lasers are that: – Lasers cant be used on teeth with fillings already in place. – Lasers cant be used in many commonly performed dental procedures. For example, lasers cant be used to fill cavities located between teeth, around old fillings, and large cavities that need to be prepared for a crown. In addition, lasers cannot be used to remove defective crowns or silver fillings, or prepare teeth for bridges.
  41. 41. Laser Cons• The disadvantages of lasers are that: – Traditional drills may still be needed to shape the filling, adjust the bite, and polish the filling even when a laser is used. – Lasers do not eliminate the need for anesthesia. – Laser treatment tends to be more expensive since the cost of the laser is much higher than a dental drill. • Lasers can cost between $39,000 and $45,000 compared to about $600 for a standard drill.

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