EXAM 2026-2027 ACTUAL COMPLETE REAL EXAM
QUESTIONS AND CORRECT ANSWERS (EXPERTLY
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Describe the absorption of Er:YAG vs ER,Cr:YSGG - ANSWER-
Er: YAG: peak
of water absorption in infrared
spectrum
ER,Cr:YSGG: less
absorption
Describe the difference in thermal penetration between Er:YAG
vs ER, Cr:YSGG - ANSWER-Er, Cr: YSGG has deeper thermal
penetration in tooth structure, (the smaller the wavelength= the
deeper the penetration)
Are Erium lasers used in soft or hard tissue? - ANSWER-Both
soft and hard
tissue
Do erbium lasers have good thermal relaxation? - ANSWER-
Yes, very little
,collateral thermal
damage
What dental procedures are erbium lasers used for? -
ANSWER--Tooth preparations (with little to no LA) -
Disinfection effect on dentin and enamel
-Bone cutting
-Rapid healing and little postoperative pain in soft tissue
-Can be used as a scalpel for periodontal procedures, gingival
contouring, biopsies, frenectomies, pre-prosthetic procedures,
etc.
What is the difference between soft tissue and hard tissue
parameters when using erbium lasers? - ANSWER-Longer
pulse durations and less or no water spray for soft tissue use. -
slightly more thermal than the hard tissue setting but still has
good thermal relaxation and minimal heat penetration into
underlying tissues
What was the first type of pulsed lasers to be used in dental
procedures in
1990? - ANSWER-
Nd:YAG
Does Nd:YAG do hard or soft tissue? - ANSWER-Soft tissue
, What type of interaction does Nd:YAG use? - ANSWER-
Photothermal
Describe the different functions of Nd:YAG - ANSWER--
primarily used for periodontal treatment: debridement of
periodontal pockets
-bacterial decontamination
-seals the treated pockets by stimulating fibrin formation, acts
as a scaffold for reattachment
-forms clots in extraction sites via fibrin formation
-gingivectomy, frenectomy, impression troughing, biopsy
Are Diode lasers soft or hard tissue? - ANSWER-soft tissue
What type of interactions occur in diode lasers? - ANSWER-
Photothermal
What type of procedures can Diode lasers do? - ANSWER--
Intraoral soft tissue
procedures: gingivectomy, biopsy, impression troughing,
and frenectomy.
-Bactericidal
-Laser assisted tooth
whitening
-Photobiomodulation
When preparing to use a diode laser, the practitioner's first step
should be to: -