MWU Laser Exam Class of 2026 || 100% Correct Answers.
The unit of frequency (number of laser pulses/sec.) is: correct answers Hertz
The unit of energy density (amount of energy per unit area) is: correct answers Fluence
What is the definition of Power? correct answers Amount of work performed per unit time,
expressed in watts (W)
During non-surgical laser-assisted periodontal therapy, how deep into the periodontal pocket is
the tip of the laser fiber placed? correct answers To the base of the pocket
A laser pulse cycles between ON for 5 ms and OFF for 20 ms. What is the duty cycle? correct
answers 20%
Vaporization of soft tissues occurs at: correct answers 100-150 C
In Photobiomodulation Therapy (PBMT), low doses stimulate wound healing while high doses
inhibit pain. What principle does this follow? correct answers Arndt-Schultz Principle
Which of the following is TRUE regarding the THOR® laser used for PMBT? correct answers It
has wavelengths of 660 nm and 810 nm
The first laser ever built in 1960 was: correct answers Ruby
Laser is an acronym for: correct answers Light amplification by stimulated emission of radiation
Dental laser beams are: correct answers Monochromatic, coherent, and collimated
Which laser wavelength can penetrate to the retina of the eye and cause damage? correct answers
Nd:YAG
Which of the following is NOT a tissue chromophore that absorbs an infrared dental laser
wavelength? correct answers Sodium
The peak power of a laser running in Continuous Wave mode is: correct answers The same as its
average power
Thermal relaxation refers to: correct answers The ability of the tissues to absorb and dissipate
heat to help minimize thermal damage with pulsed laser usage
Carbonization of soft tissues occurs at what temperature? correct answers 200+ C
Photobiomodulation utilizes which of the following? correct answers Nonionizing light sources,
lasers and LEDs, visible and infrared
, When using the 810 nm Diode laser, in what circumstance would we use the non-initiated tip?
correct answers Photobiomodulation
Which of the following is NOT a result of photobiomodulation? correct answers Reduced
function of osteoblasts
What are the two lasers that must be in contact with the tissue for ablation to happen? correct
answers Diode and Nd:YAG
When using dental lasers: correct answers Optical Density must be inscribed on the frame or lens
The laser plume: correct answers May contain hazardous chemicals and infectious agents
You have a patient that presents with melanin pigmentation of gingiva and the patient would like
the pigment removed. Which of the following lasers is BEST indicated for treatment? correct
answers Nd:YAG
Which of the following is NOT part of Porter's force analysis? correct answers Threat of
bankruptcy
What is an example of an InGaN 405 nm laser? correct answers Blu-ray disc
The smaller the diameter of a laser beam, the _______________ the power density. correct
answers Higher
Protective eyewear must be worn by everyone within the nominal hazard zone which is specific
to: correct answers The laser wavelength
According to Dr. Fitzgerald, when should the patient's laser safety glasses be placed? correct
answers Before the doctor or assistant
When using a laser to ablate soft tissue, what is the result of increasing the operator's hand
speed? correct answers Decreased fluence to the tissue
According to the Theory of Stimulated Emission: correct answers Electrons release light
identical to the incoming form of light
Only alcohol wipes should be used to remove debris from the dental laser fibers during a
procedure.
HIV has been found to be active in laser plume. correct answers Both statements are false.
When removing tissue with a laser, it is important that: correct answers The laser tip is held
perpendicular to the target tissue
What is the MOST COMMON periodontal procedure performed using a laser? correct answers
Gingivectomy
The unit of frequency (number of laser pulses/sec.) is: correct answers Hertz
The unit of energy density (amount of energy per unit area) is: correct answers Fluence
What is the definition of Power? correct answers Amount of work performed per unit time,
expressed in watts (W)
During non-surgical laser-assisted periodontal therapy, how deep into the periodontal pocket is
the tip of the laser fiber placed? correct answers To the base of the pocket
A laser pulse cycles between ON for 5 ms and OFF for 20 ms. What is the duty cycle? correct
answers 20%
Vaporization of soft tissues occurs at: correct answers 100-150 C
In Photobiomodulation Therapy (PBMT), low doses stimulate wound healing while high doses
inhibit pain. What principle does this follow? correct answers Arndt-Schultz Principle
Which of the following is TRUE regarding the THOR® laser used for PMBT? correct answers It
has wavelengths of 660 nm and 810 nm
The first laser ever built in 1960 was: correct answers Ruby
Laser is an acronym for: correct answers Light amplification by stimulated emission of radiation
Dental laser beams are: correct answers Monochromatic, coherent, and collimated
Which laser wavelength can penetrate to the retina of the eye and cause damage? correct answers
Nd:YAG
Which of the following is NOT a tissue chromophore that absorbs an infrared dental laser
wavelength? correct answers Sodium
The peak power of a laser running in Continuous Wave mode is: correct answers The same as its
average power
Thermal relaxation refers to: correct answers The ability of the tissues to absorb and dissipate
heat to help minimize thermal damage with pulsed laser usage
Carbonization of soft tissues occurs at what temperature? correct answers 200+ C
Photobiomodulation utilizes which of the following? correct answers Nonionizing light sources,
lasers and LEDs, visible and infrared
, When using the 810 nm Diode laser, in what circumstance would we use the non-initiated tip?
correct answers Photobiomodulation
Which of the following is NOT a result of photobiomodulation? correct answers Reduced
function of osteoblasts
What are the two lasers that must be in contact with the tissue for ablation to happen? correct
answers Diode and Nd:YAG
When using dental lasers: correct answers Optical Density must be inscribed on the frame or lens
The laser plume: correct answers May contain hazardous chemicals and infectious agents
You have a patient that presents with melanin pigmentation of gingiva and the patient would like
the pigment removed. Which of the following lasers is BEST indicated for treatment? correct
answers Nd:YAG
Which of the following is NOT part of Porter's force analysis? correct answers Threat of
bankruptcy
What is an example of an InGaN 405 nm laser? correct answers Blu-ray disc
The smaller the diameter of a laser beam, the _______________ the power density. correct
answers Higher
Protective eyewear must be worn by everyone within the nominal hazard zone which is specific
to: correct answers The laser wavelength
According to Dr. Fitzgerald, when should the patient's laser safety glasses be placed? correct
answers Before the doctor or assistant
When using a laser to ablate soft tissue, what is the result of increasing the operator's hand
speed? correct answers Decreased fluence to the tissue
According to the Theory of Stimulated Emission: correct answers Electrons release light
identical to the incoming form of light
Only alcohol wipes should be used to remove debris from the dental laser fibers during a
procedure.
HIV has been found to be active in laser plume. correct answers Both statements are false.
When removing tissue with a laser, it is important that: correct answers The laser tip is held
perpendicular to the target tissue
What is the MOST COMMON periodontal procedure performed using a laser? correct answers
Gingivectomy
