NOCTI Dental Assisting Exam Questions
and Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. Which of the following teeth are considered anterior teeth?
A. Molars
B. Premolars
C. Incisors and canines
D. Third molars
Anterior teeth include incisors and canines, which are located at
the front of the mouth and primarily used for cutting and tearing
food.
2. The term “occlusion” refers to:
A. Tooth decay
B. The way upper and lower teeth come together
C. Gum inflammation
, D. Jaw bone growth
Occlusion describes how the maxillary (upper) and mandibular
(lower) teeth fit together when the mouth is closed.
3. Which instrument is used to measure the depth of a periodontal
pocket?
A. Explorer
B. Periodontal probe
C. Scaler
D. Excavator
A periodontal probe is calibrated to measure the depth of the
sulcus or periodontal pocket to assess gum health.
4. The main purpose of using dental floss is to:
A. Whiten teeth
B. Remove plaque between teeth
C. Remove debris and plaque from interdental areas
D. Strengthen enamel
Flossing cleans areas between teeth where a toothbrush cannot
reach, reducing plaque accumulation and gingivitis risk.
5. Which of the following is a characteristic of a Class II cavity?
A. Found on the occlusal surface of anterior teeth
B. Found on proximal surfaces of posterior teeth
, C. Found on the lingual surface of incisors
D. Found on the root surface
Class II cavities occur on the mesial or distal surfaces of posterior
teeth, often between teeth where decay is hard to see.
6. The process of hardening a dental material using a special light is
called:
A. Mixing
B. Setting
C. Polymerization
D. Condensation
Polymerization is the chemical process that converts a resin-
based material from a pliable state to a hardened restoration
when exposed to a curing light.
7. Which of the following personal protective equipment (PPE) is
mandatory during dental procedures?
A. Gloves, mask, and lab coat
B. Gloves and hat
C. Gloves, mask, protective eyewear, and gown
D. Gloves only
Standard precautions require gloves, masks, eyewear, and
, gowns to protect both the dental professional and patient from
infectious agents.
8. Which sterilization method uses steam under pressure?
A. Dry heat
B. Chemical vapor
C. Autoclave
D. Ultrasonic
Autoclaving uses pressurized steam to achieve high-temperature
sterilization, effectively killing bacteria, viruses, and spores.
9. The term “mesial” refers to:
A. Toward the tongue
B. Toward the midline of the dental arch
C. Toward the cheek
D. Toward the crown
Mesial indicates the surface of a tooth closest to the midline of
the dental arch.
10. Which dental instrument is primarily used for removing
calculus from teeth?
A. Explorer
B. Cotton pliers
C. Scaler
and Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which of the following teeth are considered anterior teeth?
A. Molars
B. Premolars
C. Incisors and canines
D. Third molars
Anterior teeth include incisors and canines, which are located at
the front of the mouth and primarily used for cutting and tearing
food.
2. The term “occlusion” refers to:
A. Tooth decay
B. The way upper and lower teeth come together
C. Gum inflammation
, D. Jaw bone growth
Occlusion describes how the maxillary (upper) and mandibular
(lower) teeth fit together when the mouth is closed.
3. Which instrument is used to measure the depth of a periodontal
pocket?
A. Explorer
B. Periodontal probe
C. Scaler
D. Excavator
A periodontal probe is calibrated to measure the depth of the
sulcus or periodontal pocket to assess gum health.
4. The main purpose of using dental floss is to:
A. Whiten teeth
B. Remove plaque between teeth
C. Remove debris and plaque from interdental areas
D. Strengthen enamel
Flossing cleans areas between teeth where a toothbrush cannot
reach, reducing plaque accumulation and gingivitis risk.
5. Which of the following is a characteristic of a Class II cavity?
A. Found on the occlusal surface of anterior teeth
B. Found on proximal surfaces of posterior teeth
, C. Found on the lingual surface of incisors
D. Found on the root surface
Class II cavities occur on the mesial or distal surfaces of posterior
teeth, often between teeth where decay is hard to see.
6. The process of hardening a dental material using a special light is
called:
A. Mixing
B. Setting
C. Polymerization
D. Condensation
Polymerization is the chemical process that converts a resin-
based material from a pliable state to a hardened restoration
when exposed to a curing light.
7. Which of the following personal protective equipment (PPE) is
mandatory during dental procedures?
A. Gloves, mask, and lab coat
B. Gloves and hat
C. Gloves, mask, protective eyewear, and gown
D. Gloves only
Standard precautions require gloves, masks, eyewear, and
, gowns to protect both the dental professional and patient from
infectious agents.
8. Which sterilization method uses steam under pressure?
A. Dry heat
B. Chemical vapor
C. Autoclave
D. Ultrasonic
Autoclaving uses pressurized steam to achieve high-temperature
sterilization, effectively killing bacteria, viruses, and spores.
9. The term “mesial” refers to:
A. Toward the tongue
B. Toward the midline of the dental arch
C. Toward the cheek
D. Toward the crown
Mesial indicates the surface of a tooth closest to the midline of
the dental arch.
10. Which dental instrument is primarily used for removing
calculus from teeth?
A. Explorer
B. Cotton pliers
C. Scaler
