Ohio EFDA Board Exam | 180 Certification
Questions and Answers
With a Comprehensive Extended Practice Test
1. On which area of the tooth is the enamel thickest?
A. Cervical third
B. Incisal edge
C. Occlusal surface
D. Occlusal and incisal surface
Correct Answer – Occlusal and incisal surface
Rationale – The provided content explicitly states that the enamel is thickest at the
"occlusal and incisal surface."
2. Which tissue provides the defense and developmental functions of a tooth?
A. Cementum
B. Dentin
C. Enamel
D. Pulp
Correct Answer – Pulp
Rationale – The content directly identifies the pulp as the tissue responsible for these
functions.
3. Rounded borders of enamel which form the mesial and distal of the occlusal surface
on posterior teeth are named:
A. Cusps
B. Fossae
, C. Marginal ridges
D. Triangular ridges
Correct Answer – Marginal ridges
Rationale – The content defines these specific structures as marginal ridges.
4. What is the name for the surface at the base of a Class I cavity preparation?
A. Axial wall
B. Cavosurface margin
C. Pulpal floor
D. Gingival seat
Correct Answer – Pulpal floor
Rationale – The content directly states that the base of a Class I cavity preparation is the
pulpal floor.
5. Which tooth has the longest root in the mouth?
A. Mandibular canine
B. Maxillary cuspid/canine
C. Maxillary central incisor
D. Mandibular first molar
Correct Answer – Maxillary cuspid/canine
Rationale – According to the provided material, the maxillary cuspid or canine possesses
the longest root.
6. If present, the cusp of Carabelli is located on which molar?
A. Mandibular first molar
B. Maxillary first molar
, C. Maxillary second molar
D. Mandibular second molar
Correct Answer – Maxillary first molar
Rationale – The content specifies that the cusp of Carabelli is found on the mesiolingual
(ML) cusp area of the maxillary first molar.
7. The fossa found in the central portion of a molar is named the ____________ fossa.
A. Central
B. Distal
C. Mesial
D. Triangular
Correct Answer – Central
Rationale – The content directly identifies this anatomical landmark as the central fossa.
8. Where is the cavosurface margin located?
A. At the apex of the root
B. At the cementoenamel junction (CEJ)
C. At the junction of the cavity wall and the unprepared tooth structure
D. On the pulpal floor of the preparation
Correct Answer – At the junction of the cavity wall and the unprepared tooth structure
Rationale – The provided definition states the cavosurface margin is located at this
specific junction.
9. If the pulp receives an excessive stimulus, which type of dentin is formed in
response?
A. Primary dentin
, B. Sclerotic dentin
C. Reparative dentin
D. Interglobular dentin
Correct Answer – Reparative dentin
Rationale – The content states that reparative dentin is formed in response to an
excessive stimulus to the pulp.
10. What is the correct classification of caries for a carious lesion located on the
proximal surface of tooth #8?
A. Class I
B. Class II
C. Class III
D. Class V
Correct Answer – Class III
Rationale – The content defines a Class III cavity as decay on the proximal surfaces of
incisors and canines, which includes tooth #8.
11. In which direction does the oblique ridge travel across the occlusal surface of a
maxillary molar?
A. Mesiobuccal to Distolingual
B. Distobuccal to Mesiolingual
C. Mesial to Distal
D. Buccal to Lingual
Correct Answer – Distobuccal to Mesiolingual
Questions and Answers
With a Comprehensive Extended Practice Test
1. On which area of the tooth is the enamel thickest?
A. Cervical third
B. Incisal edge
C. Occlusal surface
D. Occlusal and incisal surface
Correct Answer – Occlusal and incisal surface
Rationale – The provided content explicitly states that the enamel is thickest at the
"occlusal and incisal surface."
2. Which tissue provides the defense and developmental functions of a tooth?
A. Cementum
B. Dentin
C. Enamel
D. Pulp
Correct Answer – Pulp
Rationale – The content directly identifies the pulp as the tissue responsible for these
functions.
3. Rounded borders of enamel which form the mesial and distal of the occlusal surface
on posterior teeth are named:
A. Cusps
B. Fossae
, C. Marginal ridges
D. Triangular ridges
Correct Answer – Marginal ridges
Rationale – The content defines these specific structures as marginal ridges.
4. What is the name for the surface at the base of a Class I cavity preparation?
A. Axial wall
B. Cavosurface margin
C. Pulpal floor
D. Gingival seat
Correct Answer – Pulpal floor
Rationale – The content directly states that the base of a Class I cavity preparation is the
pulpal floor.
5. Which tooth has the longest root in the mouth?
A. Mandibular canine
B. Maxillary cuspid/canine
C. Maxillary central incisor
D. Mandibular first molar
Correct Answer – Maxillary cuspid/canine
Rationale – According to the provided material, the maxillary cuspid or canine possesses
the longest root.
6. If present, the cusp of Carabelli is located on which molar?
A. Mandibular first molar
B. Maxillary first molar
, C. Maxillary second molar
D. Mandibular second molar
Correct Answer – Maxillary first molar
Rationale – The content specifies that the cusp of Carabelli is found on the mesiolingual
(ML) cusp area of the maxillary first molar.
7. The fossa found in the central portion of a molar is named the ____________ fossa.
A. Central
B. Distal
C. Mesial
D. Triangular
Correct Answer – Central
Rationale – The content directly identifies this anatomical landmark as the central fossa.
8. Where is the cavosurface margin located?
A. At the apex of the root
B. At the cementoenamel junction (CEJ)
C. At the junction of the cavity wall and the unprepared tooth structure
D. On the pulpal floor of the preparation
Correct Answer – At the junction of the cavity wall and the unprepared tooth structure
Rationale – The provided definition states the cavosurface margin is located at this
specific junction.
9. If the pulp receives an excessive stimulus, which type of dentin is formed in
response?
A. Primary dentin
, B. Sclerotic dentin
C. Reparative dentin
D. Interglobular dentin
Correct Answer – Reparative dentin
Rationale – The content states that reparative dentin is formed in response to an
excessive stimulus to the pulp.
10. What is the correct classification of caries for a carious lesion located on the
proximal surface of tooth #8?
A. Class I
B. Class II
C. Class III
D. Class V
Correct Answer – Class III
Rationale – The content defines a Class III cavity as decay on the proximal surfaces of
incisors and canines, which includes tooth #8.
11. In which direction does the oblique ridge travel across the occlusal surface of a
maxillary molar?
A. Mesiobuccal to Distolingual
B. Distobuccal to Mesiolingual
C. Mesial to Distal
D. Buccal to Lingual
Correct Answer – Distobuccal to Mesiolingual
