Ohio EFDA Board Exam – Expanded Function Dental Auxiliary Certification

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