LASER EXAM (2025/2026) | ACCURATE REAL QUESTIONS AND
VERIFIED CORRECT ANSWERS | UPDATED & GRADED A+
Which is not a way lasers interact with tissues?
a. Reflection
b. Transduction
c. Scattering
d. Absorption - CORRECT ANSWERS-b. Transduction
Which laser wavelewngths can penetrate to the retina of the eye and cause damage?
a. Diode wavelengths
b. Er:YAG
c. Nd:YAG
d. BothA&C - CORRECT ANSWERS-d. BothA&C
Light-induced fluorescence can be used for
a. Caries detection
b. Mucosal evaluation
c. Pain relief
d. BothA&B - CORRECT ANSWERS-d. BothA&B
Continuous wave lasers cause increased char of tissue compared to ultraspeed or superpulse lasers.
Ultraspeed or superpulse lasers cause minimal heat spread compared to continuous wave lasers.
a. Both statements are true
b. Statement 1 is true; statement 2 is false
,c. Both statements are false
d. Statement 1 is false; statement 2 is true - CORRECT ANSWERS-a. Both statements are true
Which of the following is the primary tissue interaction during tissue ablation?
a. Fluorescence
b. Scatter
c. Transduction
d. Absorption - CORRECT ANSWERS-d. Absorption
Test fire Diode & Nd:YAG on dark paper. Test fire Erbium & CO2 on water.
a. The first statement is true. The second statement is false.
b. Both statements are true.
c. The first statement is false. The second statement is true.
d. Both statements are false. - CORRECT ANSWERS-b. Both statements are true.
All of the following are properties of a Non-Initiated Bare Fiber except.
a. Cooler
b. Easily coagulates
c. Can be unpredictable and self-initiate when in contact with pigment/tissue
d. Laser penetration is deeper - CORRECT ANSWERS-b. Easily coagulates
Photobiomodulation (LLLT) and the treatment of Aphthous Ulcers requires the tip to be
in contact with tissue. (only false if using Thor laser)
When the tip is in contact with tissue the coagulation of diseased epithelium occurs.
a. The first statement is true. The second statement is false.
, b. Both statements are true.
c. The first statement is false. The second statement is true.
d. Both statements are false. - CORRECT ANSWERS-
Which best characterizes laser waves:
A - Quasichromatic, non-collimated, non-coherent
B - Multichromatic, non-collimated, non-coherent
C - Monochromatic, collimated, coherent - CORRECT ANSWERS-C - Monochromatic,
collimated, coherent
A laser pulse cycles between ON for 5 ms and OFF for 20 ms. What is the duty cycle?
A - 10%
B - 20%
C - 25%
D - 40% - CORRECT ANSWERS-B - 20%
Which of the following lasers is used on hard tissue?
A - CO2 9,250 nm
B - THOR
C - Nd:YAG 1064nm
D - Diodes 810-1064nm - CORRECT ANSWERS-A - CO2 9,250 nm
What is the definition of Power?
A - Ability to perform work, expressed in joules (J)
VERIFIED CORRECT ANSWERS | UPDATED & GRADED A+
Which is not a way lasers interact with tissues?
a. Reflection
b. Transduction
c. Scattering
d. Absorption - CORRECT ANSWERS-b. Transduction
Which laser wavelewngths can penetrate to the retina of the eye and cause damage?
a. Diode wavelengths
b. Er:YAG
c. Nd:YAG
d. BothA&C - CORRECT ANSWERS-d. BothA&C
Light-induced fluorescence can be used for
a. Caries detection
b. Mucosal evaluation
c. Pain relief
d. BothA&B - CORRECT ANSWERS-d. BothA&B
Continuous wave lasers cause increased char of tissue compared to ultraspeed or superpulse lasers.
Ultraspeed or superpulse lasers cause minimal heat spread compared to continuous wave lasers.
a. Both statements are true
b. Statement 1 is true; statement 2 is false
,c. Both statements are false
d. Statement 1 is false; statement 2 is true - CORRECT ANSWERS-a. Both statements are true
Which of the following is the primary tissue interaction during tissue ablation?
a. Fluorescence
b. Scatter
c. Transduction
d. Absorption - CORRECT ANSWERS-d. Absorption
Test fire Diode & Nd:YAG on dark paper. Test fire Erbium & CO2 on water.
a. The first statement is true. The second statement is false.
b. Both statements are true.
c. The first statement is false. The second statement is true.
d. Both statements are false. - CORRECT ANSWERS-b. Both statements are true.
All of the following are properties of a Non-Initiated Bare Fiber except.
a. Cooler
b. Easily coagulates
c. Can be unpredictable and self-initiate when in contact with pigment/tissue
d. Laser penetration is deeper - CORRECT ANSWERS-b. Easily coagulates
Photobiomodulation (LLLT) and the treatment of Aphthous Ulcers requires the tip to be
in contact with tissue. (only false if using Thor laser)
When the tip is in contact with tissue the coagulation of diseased epithelium occurs.
a. The first statement is true. The second statement is false.
, b. Both statements are true.
c. The first statement is false. The second statement is true.
d. Both statements are false. - CORRECT ANSWERS-
Which best characterizes laser waves:
A - Quasichromatic, non-collimated, non-coherent
B - Multichromatic, non-collimated, non-coherent
C - Monochromatic, collimated, coherent - CORRECT ANSWERS-C - Monochromatic,
collimated, coherent
A laser pulse cycles between ON for 5 ms and OFF for 20 ms. What is the duty cycle?
A - 10%
B - 20%
C - 25%
D - 40% - CORRECT ANSWERS-B - 20%
Which of the following lasers is used on hard tissue?
A - CO2 9,250 nm
B - THOR
C - Nd:YAG 1064nm
D - Diodes 810-1064nm - CORRECT ANSWERS-A - CO2 9,250 nm
What is the definition of Power?
A - Ability to perform work, expressed in joules (J)
