Lasers in Dentistry Test Questions with All Correct Answers
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Lasers in Dentistry
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Lasers In Dentistry
Lasers in Dentistry Test Questions with All Correct Answers
What tissue temperature range results in hyperthermia? - Answer- 37-50 C
What tissue temperature range results in protein denaturing, stasis, and coagulation? - Answer- > 60 C
What tissue temperature range results in welding? ...
Lasers in Dentistry Test Questions
with All Correct Answers
What tissue temperature range results in hyperthermia? - Answer- 37-50 C
What tissue temperature range results in protein denaturing, stasis, and coagulation? -
Answer- > 60 C
What tissue temperature range results in welding? - Answer- 70-90 C
What tissue temperature range results in vaporization? - Answer- 100-150 C
What tissue temperature range results in carbonization = larger zone of tissue
coagulation? - Answer- > 200 C
What temperature is required to kill bacteria? - Answer- > 50 C
What are 3 types of pigment penetrating lasers? - Answer- -Nd:YAG
-Diodes
-Argon
What are the 2 types of water lasers? - Answer- -Erbiums
-CO2
What is the biologic effect of lasers on tissue dependent on? - Answer- -Specific
wavelength
-Emission mode (continuous, gated-pulsed, or free-running pulsed)
-Duration of exposure
-Amount of cooling
-Power density
-Tissue characteristics: water, mineral, organic content, density of tissue (collagen vs.
granulation, color (pigmentation and vascularity)
, What type of laser is best suited for use on hard tissues such as in cavity preps or to
arrest bleeding in vascular tissues? - Answer- Er:YAG (**Not sure if this is true or not.
Can't even find where it's from.)
What type of laser is best suited for use on soft tissues as in oral surgery, implantology,
and conservative restorative work? - Answer- UltraSpeed CO2 (**Not sure if this is true
or not. Can't even find where it's from.)
What type of laser is best suited for use on soft tissues as in soft tissue management? -
Answer- Diodes
Diode lasers - Answer- -800-1064 nm wavelength
-Infrared spectrum
-The 1064 nm and 980 nm wavelengths are more highly absorbed in water than the
lower wavelengths such as the 810 nm.
-Absorbed by darker tissues and metals therefore must be careful when using near
implants so as not to heat metal --> kill bone
-Vaporizes soft tissue by a photothermal effect
-Works by two tissue interactions (absorption and scattering.) Scattering increases
absorption by increasing the number of target chromophores potentials.
How are diode lasers produced and administered? - Answer- -Produced by stimulating
gallium, arsenide, and phosphate with or without aluminum or indium at a wavelength of
800-1,064 nm
-Administered by continuous wave and gated/pulsed wave but most ablation surgery
should be gated/pulsed to allow for proper tissue cooling and to prevent excessive heat
being placed into the tissue
Important features for use of diode lasers include: - Answer- -Requires direct contact of
the laser fiber tip on the tissue
-Diodes are deeply-penetrating with a large zone of tissue carbonization, coagulation,
and stimulation
-During use, contact time in any one spot must be limited to 1-2 seconds so as to
reduce the degree of collateral damage to tissues
Advantages of diode lasers include: - Answer- -Can cut and coagulate soft tissue
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