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Try 5 Free NEBDN Mock Questions
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Question 1
In the image provided, which structure contains blood vessels and nerves?
A. Enamel
B. Dentine
C. Pulp Chamber
D. Cementum
E. Gingiva
Answer: C The pulp chamber houses nerves and blood vessels essential for tooth vitality
Question 2
Examination of the tooth in the image shows a deep cavitated lesion affecting the occlusal surface. Which tissue has been primarily affected beyond enamel?
A. Cementum
B. Pulp
C. Dentine
D. Periodontal Ligament
E. Alveolar Bone
Answer: C The image shows progression of caries beyond enamel into dentine.
Question 3
A patient attends for routine interproximal caries assessment. The radiograph shown is taken using a horizontal bitewing technique. Which feature best confirms that this is a bitewing radiograph?
A. Clear visualization of the apices of both maxillary and mandibular teeth
B. Inclusion of the crowns of both upper and lower posterior teeth on the same image
C. Presence of the maxillary sinus extending across the image
D. Complete visualization of the mandibular canal
E. Distortion of tooth length due to vertical angulation
Answer: B Bitewing radiographs are characterised by showing the crowns of both maxillary and mandibular posterior teeth on the same image, allowing assessment of interproximal caries and bone levels.
Question 4
A dental nurse notices that a clinician has removed gloves after treatment but keeps the same mask on while preparing instruments for decontamination. What is the main risk in this scenario?
A. Cross-contamination from a contaminated mask surface
B. Reduced visibility from mask fogging
C. Increased glove powder exposure
D. Delay in instrument transport
E. Noise from mask movement
Answer: A Masks may become contaminated during treatment and should not be handled or worn into clean decontamination tasks unnecessarily.
Question 5
A temporary crown cemented with eugenol cement is to be replaced with a bonded composite restoration the same visit. What is the best action?"
A. Remove residual eugenol thoroughly and use a non-eugenol temporary if needed
B. Leave the cement as it improves bonding
C. Etch directly over the eugenol residue only
D. Place amalgam instead of composite automatically
E. Delay treatment for exactly six months
Answer: A Eugenol can inhibit resin polymerisation, so residue should be removed and non-eugenol alternatives considered