Q1.
Which of the following instruments is primarily used to remove decay from
tooth structure?
A. Explorer
B. Spoon excavator
C. Scaler
D. Condenser
Answer: B. Spoon excavator
Explanation: A spoon excavator has a rounded blade designed to scoop out
carious dentin from tooth surfaces, whereas explorers detect caries, scalers
remove calculus, and condensers pack restorative material.
Q2.
When taking a bitewing radiograph, the central beam should be directed:
A. Perpendicular to the film and occlusal plane
B. Parallel to the long axis of the tooth
C. At a 45-degree downward angle
D. Toward the apices of the teeth
Answer: A. Perpendicular to the film and occlusal plane
Explanation: For bitewings, the beam is directed perpendicularly through the
interproximal spaces with the film parallel to the teeth, ensuring accurate
depiction of interproximal caries.
Q3.
Which isolation method is most effective during restorative procedures?
A. Cotton rolls
B. Saliva ejector
,C. Rubber dam
D. High-volume evacuator
Answer: C. Rubber dam
Explanation: A rubber dam provides the best moisture control, visibility, and
infection control during restorative procedures.
Q4.
What is the maximum safe dosage of epinephrine for a healthy adult in local
anesthesia?
A. 0.1 mg
B. 0.2 mg
C. 1 mg
D. 2 mg
Answer: B. 0.2 mg
Explanation: The ADA recommends a maximum of 0.2 mg epinephrine for
healthy adults and 0.04 mg for patients with cardiovascular disease.
Q5.
When mixing alginate impression material, what water temperature provides the
longest working time?
A. Cold water
B. Warm water
C. Room temperature water
D. Boiling water
Answer: A. Cold water
Explanation: Cold water slows the setting reaction of alginate, giving more
working time, while warm water accelerates the set.
Q6.
Which matrix system is most commonly used for Class II restorations in
posterior teeth?
A. T-band
,B. Tofflemire retainer with matrix band
C. Sectional matrix
D. Clear strip matrix
Answer: B. Tofflemire retainer with matrix band
Explanation: The Tofflemire matrix system stabilizes the band around
posterior teeth, helping shape and contour Class II restorations.
Q7.
Which PPE is required when assisting with ultrasonic scaling?
A. Mask only
B. Gloves and protective eyewear
C. Gloves, eyewear, mask, gown
D. Gown only
Answer: C. Gloves, eyewear, mask, gown
Explanation: Ultrasonic scalers produce aerosols; therefore, full PPE including
gloves, mask, protective eyewear, and gown are required.
Q8.
Which dental cement is most commonly used for permanent luting of crowns?
A. Zinc oxide-eugenol
B. Polycarboxylate
C. Glass ionomer
D. Zinc phosphate
Answer: C. Glass ionomer
Explanation: Glass ionomer cement releases fluoride, bonds chemically to
tooth structure, and is widely used for permanent cementation.
Q9.
The purpose of etching enamel before placing composite restorations is to:
A. Kill bacteria
B. Increase surface roughness for bonding
, C. Seal dentinal tubules
D. Reduce sensitivity
Answer: B. Increase surface roughness for bonding
Explanation: Acid etching (commonly with 37% phosphoric acid) creates
microporosities in enamel for micromechanical retention of composites.
Q10.
The correct sequence for instrument transfer during a restorative procedure is:
A. Assistant holds instrument, dentist takes
B. Dentist sets instrument down, assistant retrieves
C. Assistant transfers at dentist’s request
D. Assistant transfers directly into dentist’s working hand
Answer: D. Assistant transfers directly into dentist’s working hand
Explanation: Efficient four-handed dentistry requires direct transfer into the
operator’s working hand without delay.
Q11.
Which handpiece is used for finishing and polishing restorations?
A. Slow-speed with contra-angle
B. High-speed with straight attachment
C. Ultrasonic scaler
D. Laboratory handpiece
Answer: A. Slow-speed with contra-angle
Explanation: A slow-speed contra-angle handpiece provides better control for
finishing, polishing, and refining restorative surfaces.
Q12.
Which of the following is a critical factor in preventing cross-contamination
during instrument transfer?
A. Use of high-volume suction
B. Avoiding overgloves
C. Proper use of transfer zone
D. Wearing protective eyewear
Which of the following instruments is primarily used to remove decay from
tooth structure?
A. Explorer
B. Spoon excavator
C. Scaler
D. Condenser
Answer: B. Spoon excavator
Explanation: A spoon excavator has a rounded blade designed to scoop out
carious dentin from tooth surfaces, whereas explorers detect caries, scalers
remove calculus, and condensers pack restorative material.
Q2.
When taking a bitewing radiograph, the central beam should be directed:
A. Perpendicular to the film and occlusal plane
B. Parallel to the long axis of the tooth
C. At a 45-degree downward angle
D. Toward the apices of the teeth
Answer: A. Perpendicular to the film and occlusal plane
Explanation: For bitewings, the beam is directed perpendicularly through the
interproximal spaces with the film parallel to the teeth, ensuring accurate
depiction of interproximal caries.
Q3.
Which isolation method is most effective during restorative procedures?
A. Cotton rolls
B. Saliva ejector
,C. Rubber dam
D. High-volume evacuator
Answer: C. Rubber dam
Explanation: A rubber dam provides the best moisture control, visibility, and
infection control during restorative procedures.
Q4.
What is the maximum safe dosage of epinephrine for a healthy adult in local
anesthesia?
A. 0.1 mg
B. 0.2 mg
C. 1 mg
D. 2 mg
Answer: B. 0.2 mg
Explanation: The ADA recommends a maximum of 0.2 mg epinephrine for
healthy adults and 0.04 mg for patients with cardiovascular disease.
Q5.
When mixing alginate impression material, what water temperature provides the
longest working time?
A. Cold water
B. Warm water
C. Room temperature water
D. Boiling water
Answer: A. Cold water
Explanation: Cold water slows the setting reaction of alginate, giving more
working time, while warm water accelerates the set.
Q6.
Which matrix system is most commonly used for Class II restorations in
posterior teeth?
A. T-band
,B. Tofflemire retainer with matrix band
C. Sectional matrix
D. Clear strip matrix
Answer: B. Tofflemire retainer with matrix band
Explanation: The Tofflemire matrix system stabilizes the band around
posterior teeth, helping shape and contour Class II restorations.
Q7.
Which PPE is required when assisting with ultrasonic scaling?
A. Mask only
B. Gloves and protective eyewear
C. Gloves, eyewear, mask, gown
D. Gown only
Answer: C. Gloves, eyewear, mask, gown
Explanation: Ultrasonic scalers produce aerosols; therefore, full PPE including
gloves, mask, protective eyewear, and gown are required.
Q8.
Which dental cement is most commonly used for permanent luting of crowns?
A. Zinc oxide-eugenol
B. Polycarboxylate
C. Glass ionomer
D. Zinc phosphate
Answer: C. Glass ionomer
Explanation: Glass ionomer cement releases fluoride, bonds chemically to
tooth structure, and is widely used for permanent cementation.
Q9.
The purpose of etching enamel before placing composite restorations is to:
A. Kill bacteria
B. Increase surface roughness for bonding
, C. Seal dentinal tubules
D. Reduce sensitivity
Answer: B. Increase surface roughness for bonding
Explanation: Acid etching (commonly with 37% phosphoric acid) creates
microporosities in enamel for micromechanical retention of composites.
Q10.
The correct sequence for instrument transfer during a restorative procedure is:
A. Assistant holds instrument, dentist takes
B. Dentist sets instrument down, assistant retrieves
C. Assistant transfers at dentist’s request
D. Assistant transfers directly into dentist’s working hand
Answer: D. Assistant transfers directly into dentist’s working hand
Explanation: Efficient four-handed dentistry requires direct transfer into the
operator’s working hand without delay.
Q11.
Which handpiece is used for finishing and polishing restorations?
A. Slow-speed with contra-angle
B. High-speed with straight attachment
C. Ultrasonic scaler
D. Laboratory handpiece
Answer: A. Slow-speed with contra-angle
Explanation: A slow-speed contra-angle handpiece provides better control for
finishing, polishing, and refining restorative surfaces.
Q12.
Which of the following is a critical factor in preventing cross-contamination
during instrument transfer?
A. Use of high-volume suction
B. Avoiding overgloves
C. Proper use of transfer zone
D. Wearing protective eyewear
