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Patient Care and Chairside Procedures

Chairside Assisting: Sealants and Polishing Practice Questions

20 free Chairside Assisting: Sealants and Polishing practice questions for the CDA. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.

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Question 1 of 20 Medium

What is the primary purpose of applying dental sealants?

  1. A To brighten the natural color of enamel
  2. B To protect pits and fissures from decay
  3. C To reinforce and strengthen tooth roots
  4. D To close spaces between adjacent teeth

Correct answer: To protect pits and fissures from decay

Sealants create a protective barrier over pits and fissures. This prevents bacteria and debris from initiating caries.

Question 2 of 20 Medium

Before applying a sealant, the tooth surface must be thoroughly:

  1. A Dried and isolated
  2. B Fluoridated
  3. C Polished with heavy pumice
  4. D Coated with varnish

Correct answer: Dried and isolated

Dry isolation ensures successful bonding of sealant material. Moisture contamination can cause sealant failure.

Question 3 of 20 Medium

Which instrument or device is used to cure light-activated sealants?

  1. A Amalgam condenser
  2. B Scaler
  3. C LED curing light
  4. D Prophy angle

Correct answer: LED curing light

LED curing lights polymerize resin-based sealants. Proper curing ensures a strong, durable seal.

Question 4 of 20 Medium

Which step is required immediately before placing the sealant material?

  1. A Etching the enamel
  2. B Applying fluoride
  3. C Checking occlusion
  4. D Using articulating paper

Correct answer: Etching the enamel

Etching creates micropores in enamel to improve sealant retention. It is essential for strong adhesion.

Question 5 of 20 Medium

Which isolation method is commonly used during sealant placement?

  1. A Dry angles and cotton rolls
  2. B Rubber dam only
  3. C Gauze isolation
  4. D No isolation is needed

Correct answer: Dry angles and cotton rolls

Dry angles and cotton rolls keep the tooth clean and dry. Moisture control is critical for successful bonding.

Question 6 of 20 Medium

How should occlusion be checked after sealant placement?

  1. A With floss only
  2. B With articulating paper
  3. C With a mouth mirror
  4. D With bite registration material

Correct answer: With articulating paper

Articulating paper shows high spots after curing. Adjustments are made to prevent interference with chewing.

Question 7 of 20 Medium

What should be done if saliva contaminates the tooth after etching and before sealant placement?

  1. A Apply sealant immediately
  2. B Rinse, dry, and re-etch the tooth
  3. C Apply additional cotton rolls
  4. D Cure the tooth surface before sealing

Correct answer: Rinse, dry, and re-etch the tooth

Contamination compromises bonding. Re-etching restores enamel’s ability to retain the sealant.

Question 8 of 20 Medium

Which polishing agent is most appropriate for removing plaque and stains before sealant placement?

  1. A Fluoride prophy paste
  2. B Oil-based paste
  3. C Non-fluoride pumice
  4. D Whitening gel

Correct answer: Non-fluoride pumice

Non-fluoride pumice prevents interference with the bonding process. Fluoridated pastes can reduce retention.

Question 9 of 20 Medium

What is the recommended appearance of properly etched enamel?

  1. A Glossy and smooth
  2. B Frosty and chalky
  3. C Dark and shiny
  4. D Opaque yellow

Correct answer: Frosty and chalky

A frosty, chalky appearance indicates successful etching. This surface allows ideal mechanical retention.

Question 10 of 20 Medium

What is the primary purpose of polishing procedures?

  1. A To remove enamel
  2. B To create a smooth, stain-free surface
  3. C To whiten the teeth
  4. D To roughen the enamel surface

Correct answer: To create a smooth, stain-free surface

Polishing removes plaque, stains, and soft deposits. It leaves the surface smooth and easier to keep clean.

Question 11 of 20 Medium

Which type of prophy cup is best for polishing occlusal surfaces?

  1. A Pointed cup
  2. B Soft rubber cup
  3. C Bristle brush
  4. D Metal cup

Correct answer: Bristle brush

Bristle brushes adapt well to pits and fissures. They effectively clean and polish grooves before sealants.

Question 12 of 20 Medium

Which speed is appropriate when using a slow-speed handpiece for polishing?

  1. A High speed only for best results
  2. B Very low speed to avoid heat
  3. C Full power to maximize efficiency
  4. D The maximum available speed setting

Correct answer: Very low speed to avoid heat

Low speeds reduce friction and heat, protecting enamel. Excessive speed can damage tooth surfaces.

Question 13 of 20 Medium

Prophy angles are typically attached to which type of handpiece?

  1. A High-speed handpiece
  2. B Electric torque handpiece
  3. C Slow-speed handpiece
  4. D Ultrasonic scaler handpiece

Correct answer: Slow-speed handpiece

Polishing is performed with a slow-speed handpiece. It provides better control and reduces risk of injury.

Question 14 of 20 Medium

What is the primary purpose of using disclosing agents before polishing?

  1. A To whiten the teeth
  2. B To identify plaque areas
  3. C To enhance fluoride uptake
  4. D To etch enamel

Correct answer: To identify plaque areas

Disclosing agents stain plaque so it can be seen and removed. They help guide effective polishing.

Question 15 of 20 Medium

What issue may occur if excessive pressure is applied during polishing?

  1. A Immediate whitening of the tooth
  2. B Rapid dehydration of the tooth
  3. C Heat production and enamel damage
  4. D Faster curing of the sealant material

Correct answer: Heat production and enamel damage

Excess pressure generates heat that can irritate the pulp. Gentle, controlled polishing prevents this.

Question 16 of 20 Medium

Why is rubber dam rarely used for sealant application?

  1. A It interferes with curing
  2. B Isolation with dry angles is usually sufficient
  3. C Sealants bond poorly when rubber dams are used
  4. D Rubber dam creates excessive moisture

Correct answer: Isolation with dry angles is usually sufficient

Dry angles and cotton rolls provide efficient isolation for sealants. This method is faster and well-tolerated by patients.

Question 17 of 20 Medium

Which surface is most commonly sealed in preventive dentistry?

  1. A Smooth buccal surfaces
  2. B Anterior lingual surfaces
  3. C Posterior occlusal surfaces
  4. D Incisal edges

Correct answer: Posterior occlusal surfaces

Occlusal surfaces have deep pits and fissures that trap bacteria. Sealants reduce decay in these high-risk areas.

Question 18 of 20 Medium

After curing, what is the next step in sealant evaluation?

  1. A Checking for complete coverage and retention
  2. B Applying fluoride gel
  3. C Polishing with prophy paste
  4. D Scaling over the sealant

Correct answer: Checking for complete coverage and retention

Proper coverage and complete curing ensure effectiveness. Sealants should appear smooth and fully bonded.

Question 19 of 20 Medium

If a sealant partially fractures at follow-up, what is the recommended management?

  1. A Remove the entire sealant and start over
  2. B Add new sealant after cleaning and etching
  3. C Do nothing at all unless active decay is present
  4. D Place a temporary filling over the area

Correct answer: Add new sealant after cleaning and etching

Sealants can be repaired by re-etching and adding material. This restores protection without full removal.

Question 20 of 20 Medium

Which polishing paste is recommended for patients with composite restorations?

  1. A Heavy coarse paste
  2. B Oil-based abrasive paste
  3. C Non-abrasive or low-abrasive paste
  4. D Fluoride-free pumice only

Correct answer: Non-abrasive or low-abrasive paste

Low-abrasive paste protects composite surfaces from scratching. It preserves esthetics and smoothness.

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