LATEST Certified Orthodontic Assistant
(COA) certification EXAM, offered by the
Dental Assisting National Board (DANB). |
Q&A WITH RATIONALES - Pass DANB COA
on Your First Try
1. The term "malocclusion" refers to:
A) The normal alignment of teeth
B) The improper alignment of teeth and/or jaws
C) A condition of tooth decay
D) Inflammation of the gums
Correct answer: B
Rationale: Malocclusion is defined as the improper
alignment of teeth and/or jaws when the mouth is
closed, which can affect function, aesthetics, and
oral health.
2. In Angle's Classification of Malocclusion, Class I
malocclusion is characterized by:
A) The mesiobuccal cusp of the maxillary first molar
occluding distal to the buccal groove of the
mandibular first molar
,B) The mesiobuccal cusp of the maxillary first molar
occluding mesial to the buccal groove of the
mandibular first molar
C) The mesiobuccal cusp of the maxillary first molar
occluding directly into the buccal groove of the
mandibular first molar with crowding or spacing
present elsewhere
D) The maxillary anterior teeth overlapping the
mandibular anterior teeth
Correct answer: C
Rationale: In Class I malocclusion (neutroclusion),
the molar relationship is normal (Class I), but there is
crowding, spacing, or other irregularities in the
alignment of the teeth.
3. Angle's Class II malocclusion is divided into two
divisions based on the position of the:
A) Mandibular incisors
B) Maxillary incisors
C) Mandibular first molars
D) Maxillary canines
Correct answer: B
Rationale: Class II malocclusion (distoclusion) is
divided into Division 1 (proclined maxillary incisors)
,and Division 2 (retroclined maxillary incisors with
deep overbite).
4. A patient with a Class III malocclusion has a
maxillary first molar mesiobuccal cusp that occludes:
A) Directly in the buccal groove of the mandibular
first molar
B) Distal to the buccal groove of the mandibular first
molar
C) Mesial to the buccal groove of the mandibular first
molar
D) Lingual to the mandibular first molar
Correct answer: C
Rationale: Class III malocclusion (mesioclusion) is
characterized by the mesiobuccal cusp of the
maxillary first molar occluding mesial (anterior) to the
buccal groove of the mandibular first molar.
5. An excessive vertical overlap of the maxillary
incisors over the mandibular incisors is called:
A) Overjet
B) Crossbite
C) Open bite
, D) Overbite
Correct answer: D
Rationale: Overbite (vertical overlap) is the amount of
vertical overlap of the maxillary incisors over the
mandibular incisors. Normal overbite is typically 1-2
mm.
6. The horizontal distance between the lingual
surface of the maxillary incisors and the labial
surface of the mandibular incisors is called:
A) Overbite
B) Overjet
C) Open bite
D) Crossbite
Correct answer: B
Rationale: Overjet is the horizontal projection of the
maxillary anterior teeth beyond the mandibular
anterior teeth. Excessive overjet is often called "buck
teeth."
7. A malocclusion in which a tooth is positioned more
buccally or lingually than normal in relation to the
opposing arch is called a(n):
A) Open bite
(COA) certification EXAM, offered by the
Dental Assisting National Board (DANB). |
Q&A WITH RATIONALES - Pass DANB COA
on Your First Try
1. The term "malocclusion" refers to:
A) The normal alignment of teeth
B) The improper alignment of teeth and/or jaws
C) A condition of tooth decay
D) Inflammation of the gums
Correct answer: B
Rationale: Malocclusion is defined as the improper
alignment of teeth and/or jaws when the mouth is
closed, which can affect function, aesthetics, and
oral health.
2. In Angle's Classification of Malocclusion, Class I
malocclusion is characterized by:
A) The mesiobuccal cusp of the maxillary first molar
occluding distal to the buccal groove of the
mandibular first molar
,B) The mesiobuccal cusp of the maxillary first molar
occluding mesial to the buccal groove of the
mandibular first molar
C) The mesiobuccal cusp of the maxillary first molar
occluding directly into the buccal groove of the
mandibular first molar with crowding or spacing
present elsewhere
D) The maxillary anterior teeth overlapping the
mandibular anterior teeth
Correct answer: C
Rationale: In Class I malocclusion (neutroclusion),
the molar relationship is normal (Class I), but there is
crowding, spacing, or other irregularities in the
alignment of the teeth.
3. Angle's Class II malocclusion is divided into two
divisions based on the position of the:
A) Mandibular incisors
B) Maxillary incisors
C) Mandibular first molars
D) Maxillary canines
Correct answer: B
Rationale: Class II malocclusion (distoclusion) is
divided into Division 1 (proclined maxillary incisors)
,and Division 2 (retroclined maxillary incisors with
deep overbite).
4. A patient with a Class III malocclusion has a
maxillary first molar mesiobuccal cusp that occludes:
A) Directly in the buccal groove of the mandibular
first molar
B) Distal to the buccal groove of the mandibular first
molar
C) Mesial to the buccal groove of the mandibular first
molar
D) Lingual to the mandibular first molar
Correct answer: C
Rationale: Class III malocclusion (mesioclusion) is
characterized by the mesiobuccal cusp of the
maxillary first molar occluding mesial (anterior) to the
buccal groove of the mandibular first molar.
5. An excessive vertical overlap of the maxillary
incisors over the mandibular incisors is called:
A) Overjet
B) Crossbite
C) Open bite
, D) Overbite
Correct answer: D
Rationale: Overbite (vertical overlap) is the amount of
vertical overlap of the maxillary incisors over the
mandibular incisors. Normal overbite is typically 1-2
mm.
6. The horizontal distance between the lingual
surface of the maxillary incisors and the labial
surface of the mandibular incisors is called:
A) Overbite
B) Overjet
C) Open bite
D) Crossbite
Correct answer: B
Rationale: Overjet is the horizontal projection of the
maxillary anterior teeth beyond the mandibular
anterior teeth. Excessive overjet is often called "buck
teeth."
7. A malocclusion in which a tooth is positioned more
buccally or lingually than normal in relation to the
opposing arch is called a(n):
A) Open bite
