NBDHE REVIEW 667 COMPETENCY REVIEW
2026 MOCK TEST COMPLETE KEY INSIGHTS
◉ low level disinfectants are used in.
Answer: used at home
◉ sterilization.
Answer: kills all pathogenic microbes, including spores
◉ chemical sterilization: time, temp, psi, needs _________, no _______,
spore test.
Answer: 20 mins, 273, 25psi, ventilation, rubber and plastic items, G.
stearo
◉ dry sterilization: time, temp, best for____, no____, spore test.
Answer: 2 hr @ 320/1 hr @ 340, metal instruments, paper/rubber/
plastics/hand pieces,
spore test = B. atro
◉ steam sterilization: Time, temp, psi, no_____, causes _____, spore
test.
,Answer: 30 min, 250, 15-20 lbs, non stainless steel instruments,
corrosion/dulls, G. stear
◉ disinfection.
Answer: kills most pathogenic microbes, not spores
◉ Class 1 (GV Black).
Answer: pit and fissures on B/L/O of posterior teeth, and L of
anteriors
◉ Class 2 (GV Black).
Answer: proximal surface of posterior teeth; commonly involves
occlusal surface
◉ Class 3 (GV Black).
Answer: proximal surface of anterior teeth
◉ Class 4 (GV Black).
Answer: proximal surface of anterior teeth w/ incisal edge
◉ Class 5 (GV Black).
Answer: cervical 1/3 of any tooth (root caries)
,◉ Class 6 (GV Black).
Answer: incisal edge of anteriors or cusp tips of posteriors
◉ what is calculus.
Answer: mineralized plaque, irritant for the gingiva
◉ black extrinsic stain caused by.
Answer: iron, insoluble ferric sulfide and gram +
◉ bluish green extrinsic stain caused by.
Answer: inhaling metallic dust
◉ brown extrinsic stain caused by.
Answer: poor oral hygiene and or dark colored beverages
◉ dark-brown and black extrinsic stain caused by.
Answer: tobacco use
◉ orange extrinsic stain caused by, location.
Answer: chromogenic bacteria in plaque, poor oral hygiene, on
anterior teeth
, ◉ yellow-brown and brown extrinsic stain caused by.
Answer: chlorexidine use or stannous fluoride
◉ green extrinsic stain caused by.
Answer: poor oral hygiene, chormogenic bacteria, fungi, and gingival
hemorrhage
◉ class 1 furcation.
Answer: early evidence of bone loss; instrument can enter the
depression
◉ class 2 furcation.
Answer: moderate bone loss; instrument can enter furcation
◉ class 3 furcation.
Answer: severe bone loss; instrument can pass between roots
◉ class 4 furcation.
Answer: same as Class 3 but with evidence of recession
◉ demineralization pH.
2026 MOCK TEST COMPLETE KEY INSIGHTS
◉ low level disinfectants are used in.
Answer: used at home
◉ sterilization.
Answer: kills all pathogenic microbes, including spores
◉ chemical sterilization: time, temp, psi, needs _________, no _______,
spore test.
Answer: 20 mins, 273, 25psi, ventilation, rubber and plastic items, G.
stearo
◉ dry sterilization: time, temp, best for____, no____, spore test.
Answer: 2 hr @ 320/1 hr @ 340, metal instruments, paper/rubber/
plastics/hand pieces,
spore test = B. atro
◉ steam sterilization: Time, temp, psi, no_____, causes _____, spore
test.
,Answer: 30 min, 250, 15-20 lbs, non stainless steel instruments,
corrosion/dulls, G. stear
◉ disinfection.
Answer: kills most pathogenic microbes, not spores
◉ Class 1 (GV Black).
Answer: pit and fissures on B/L/O of posterior teeth, and L of
anteriors
◉ Class 2 (GV Black).
Answer: proximal surface of posterior teeth; commonly involves
occlusal surface
◉ Class 3 (GV Black).
Answer: proximal surface of anterior teeth
◉ Class 4 (GV Black).
Answer: proximal surface of anterior teeth w/ incisal edge
◉ Class 5 (GV Black).
Answer: cervical 1/3 of any tooth (root caries)
,◉ Class 6 (GV Black).
Answer: incisal edge of anteriors or cusp tips of posteriors
◉ what is calculus.
Answer: mineralized plaque, irritant for the gingiva
◉ black extrinsic stain caused by.
Answer: iron, insoluble ferric sulfide and gram +
◉ bluish green extrinsic stain caused by.
Answer: inhaling metallic dust
◉ brown extrinsic stain caused by.
Answer: poor oral hygiene and or dark colored beverages
◉ dark-brown and black extrinsic stain caused by.
Answer: tobacco use
◉ orange extrinsic stain caused by, location.
Answer: chromogenic bacteria in plaque, poor oral hygiene, on
anterior teeth
, ◉ yellow-brown and brown extrinsic stain caused by.
Answer: chlorexidine use or stannous fluoride
◉ green extrinsic stain caused by.
Answer: poor oral hygiene, chormogenic bacteria, fungi, and gingival
hemorrhage
◉ class 1 furcation.
Answer: early evidence of bone loss; instrument can enter the
depression
◉ class 2 furcation.
Answer: moderate bone loss; instrument can enter furcation
◉ class 3 furcation.
Answer: severe bone loss; instrument can pass between roots
◉ class 4 furcation.
Answer: same as Class 3 but with evidence of recession
◉ demineralization pH.
