Medical problem 3 4


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Medical problem 3 4

  1. 1. Islam Kassem, BDS , MSc, MOMS RCPS Glasg,FFD RCSIConsultant Oral & Maxillofacial SurgeonMedical Topics
  2. 2. Criteria of selected techniqueEffect on healingEffect on painEffect on edemaEffect on intra operative bleedingEffect on Tooth
  3. 3. L A S E RLight AmplificationbyStimulatedEmissionofRadiationLasersLaser
  4. 4. Model of an atom by Niels BohrBorn in Copenhagen1922: Nobel Physics PrizewinnerLasersLaser theory -
  5. 5. The laser – a very special
  6. 6. Laser CharacteristicsMonochromaticCollimatedCoherentHigh
  7. 7. Coherence: Temporal and spatialsynchronization of wavemovementLasersLaser theory – Basics: laser lightNormal light Laser light (coherent)
  8. 8. LasersDesign of a laserFully reflectingmirrorResonatorReflectorSemipermeable mirrorReflectorMediumFlash lampLaser
  9. 9. According towave lengthIR Visible
  10. 10. Accordingto deliveryArticulatedarmWaveguideFiber
  11. 11. Laser ClassificationsAccording tolaser mediumSolid(ND:YAG Liquid (Dye) Gas (CO2)
  12. 12. Accordingto modeCW PulsedSuper andUltra
  13. 13. Laser tissue InteractionLaser maybeScattered Reflected
  14. 14. Warm-up37 – 60°CnonenonePenetrationof protein60 – 65°CWhitish-graycoloration,increaseddispersionDecompositionDesiccation90 – 100°CConstantdispersionShrinkage,dehydrationCarbonizationSeveral hundred °CBlackcoloration,increasedabsorptionStrongmechanicaldamageVaporizationCombustionFormationof smokeand gasAblationTemperatureProcessOpticalchangeMechanicalchangeLasersInteractions between laser light and
  15. 15. LasersEffect of the laser on biological tissueDamagereversible irreversibleVaporizationCarbonizationCoagulationLaser
  16. 16. Laser tissue interactionPhotothermal(CW)Photochemical(CW ,PulsedPhotoablationPulsed)
  17. 17. Effects on human tissueTransmissionAbsorptionReflectionLasersLaser-tissue interaction: Beam
  18. 18. A therapeutic effect is attainedonly if the tissue absorbs the laser energy!LasersLaser-tissue
  19. 19. ChromophoresAccording to the optical properties oftissues. For example CO2  WaterThis Character is strongly affected by thelaser physical properties
  20. 20. Carbon dioxide laserPatel et al., working in Bell laboratories in 1964,were the first to develop the CO2 laser.Carbon dioxide (CO2 ) lasers have been used indentistry in the specialty practice of oral surgeryand periodontology since the early 1980s, in thepast five years, the use of these lasers hasextended into general practice.CO2 laser was the first laser approved by the
  21. 21. Of greatest significance is the high degree ofabsorption by oral mucosal tissues, which arecomposed of 90% water. Absorption of the laserby intracellular water results in a photo thermaleffect that is manifested by cellular rupture.This cellular vaporization is the basis for the use ofthe CO2 laser as a surgical tool.Heat is generated and conducted into surroundingtissues, creating a zone of lateral thermal damage;this zone of necrosis has been found to be 500mm or less Lateral thermal damage results incoagulation of vessels up to 500 mm in diameterand is clinically manifested by
  22. 22. Post surgical bacteremia also has been foundto be greatly reduced with laser use as aresult of sealing of blood vessels andlymphatic compared with other methods ofincision Laser wounds exhibit histologicalfeatures that confer significant advantagesover those created by scalpel
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  24. 24. Laser HazardsClass ILaser videodiskClass IILaser PointerClass IIISurgical laserClass IVFire
  25. 25. Laser Safety & Protection1- Eye protection2- protection to lips , skin of the face3- Protection from fire , toxic gases .4- Laser reflection from surgical instrument.5-Hazards of laser
  26. 26.
  27. 27. Clinical
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  29. 29.
  30. 30. Low level
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  32. 32. My Contact You can ge thelectures form