DH101 Final Exam Review with
Complete Solutions
1. A defect that occurs as a result of a disturbance in the formation of the organic
enamel matrix is known as:
A) Enamel hypoplasia
B) Attrition
C) Erosion
D) Abrasion - ANS-Enamel hypoplasia
2. A blood pressure reading of 90/65 would be in which classification?
A) Prehypertension
B) Posthypertension
C) Normal
D) Hypotension - ANS-Hypotension
3. When biofilm is left undisturbed on the tooth surface, gingivitis develops within:
A) 1 day
B) 3 days
C) 7 hours
D) 10-21 days - ANS-10-21 days
4. Biofilm occurs least frequently:
A) On proximal surfaces
B) At the gingival margin
C) Around the gingival third of the tooth
D) On the palatal surfaces - ANS-On the palatal surfaces
5. Critical pH for enamel demineralization averages:
A) 4.5 to 5.5
B) 6.2 - 7.0
C) 6.0 - 6.4
D) None of these are correct - ANS-4.5 to 5.5
6. Which one is a loosely adherent mass of bacteria and cellular debris and is white or
grayish-white in appearance?
A) Dental plaque
B) Materia alba
C) Calculus
D) Acquired pellicle - ANS-Materia alba
, 7. Dental calculus can form on dentures:
A) True
B) False - ANS-True
8. The steps for calculus formation, in chronological order, are:
A) Biofilm formation, mineralization, pellicle formation
B) Pellicle formation, biofilm formation, mineralization
C) Mineralization, pellicle formation, biofilm formation
D) Mineralization, biofilm formation, pellicle formation - ANS-Pellicle formation, biofilm
formation, mineralization
9. Which one of the following is the most highly mineralized tissue in the body?
A) Cementum
B) Bone
C) Enamel
D) Dentin - ANS-Enamel
10. Calculus-control ("tartar-control") dentifrices contain:
A) Calcium
B) A pyrophosphate or zinc system
C) Sodium fluoride
D) A stannous fluoride system - ANS-A pyrophosphate or zinc system
11. _____________ is the only professional topical fluoride to be used for children
under the age of 6 years.
A) Varnish
B) Sodium Fluoride gel
C) Stannous fluoride
D) Acidulated phosphate fluoride foam - ANS-Varnish
12. Calculus occurs most frequently on:
A) Lingual surfaces of maxillary molars
B) Facial surfaces of maxillary molars
C) Lingual surfaces of maxillary incisors
D) None of these are correct - ANS-Facial surfaces of maxillary molars
13. White spots on a single tooth due to ameloblastic disturbance are called:
A) Local enamel hypoplasia
B) Dentinogenesis imperfecta
C) Decalcification
D) Dental fluorosis - ANS-Local enamel hypoplasia
14. Which is true of betel leaf?
A) Causes decalcification
B) Has a caries-inhibiting effect
Complete Solutions
1. A defect that occurs as a result of a disturbance in the formation of the organic
enamel matrix is known as:
A) Enamel hypoplasia
B) Attrition
C) Erosion
D) Abrasion - ANS-Enamel hypoplasia
2. A blood pressure reading of 90/65 would be in which classification?
A) Prehypertension
B) Posthypertension
C) Normal
D) Hypotension - ANS-Hypotension
3. When biofilm is left undisturbed on the tooth surface, gingivitis develops within:
A) 1 day
B) 3 days
C) 7 hours
D) 10-21 days - ANS-10-21 days
4. Biofilm occurs least frequently:
A) On proximal surfaces
B) At the gingival margin
C) Around the gingival third of the tooth
D) On the palatal surfaces - ANS-On the palatal surfaces
5. Critical pH for enamel demineralization averages:
A) 4.5 to 5.5
B) 6.2 - 7.0
C) 6.0 - 6.4
D) None of these are correct - ANS-4.5 to 5.5
6. Which one is a loosely adherent mass of bacteria and cellular debris and is white or
grayish-white in appearance?
A) Dental plaque
B) Materia alba
C) Calculus
D) Acquired pellicle - ANS-Materia alba
, 7. Dental calculus can form on dentures:
A) True
B) False - ANS-True
8. The steps for calculus formation, in chronological order, are:
A) Biofilm formation, mineralization, pellicle formation
B) Pellicle formation, biofilm formation, mineralization
C) Mineralization, pellicle formation, biofilm formation
D) Mineralization, biofilm formation, pellicle formation - ANS-Pellicle formation, biofilm
formation, mineralization
9. Which one of the following is the most highly mineralized tissue in the body?
A) Cementum
B) Bone
C) Enamel
D) Dentin - ANS-Enamel
10. Calculus-control ("tartar-control") dentifrices contain:
A) Calcium
B) A pyrophosphate or zinc system
C) Sodium fluoride
D) A stannous fluoride system - ANS-A pyrophosphate or zinc system
11. _____________ is the only professional topical fluoride to be used for children
under the age of 6 years.
A) Varnish
B) Sodium Fluoride gel
C) Stannous fluoride
D) Acidulated phosphate fluoride foam - ANS-Varnish
12. Calculus occurs most frequently on:
A) Lingual surfaces of maxillary molars
B) Facial surfaces of maxillary molars
C) Lingual surfaces of maxillary incisors
D) None of these are correct - ANS-Facial surfaces of maxillary molars
13. White spots on a single tooth due to ameloblastic disturbance are called:
A) Local enamel hypoplasia
B) Dentinogenesis imperfecta
C) Decalcification
D) Dental fluorosis - ANS-Local enamel hypoplasia
14. Which is true of betel leaf?
A) Causes decalcification
B) Has a caries-inhibiting effect
