Pit and Fissure Sealants Practice Questions
20 free Pit and Fissure Sealants practice questions for the CDA. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
What is the primary purpose of pit and fissure sealants?
- A To whiten and brighten posterior teeth
- B To block bacteria and debris from grooves
- C To strengthen and support periodontal ligaments
- D To replace lost or missing tooth structure
Correct answer: To block bacteria and debris from grooves
Sealants prevent caries by sealing deep pits and fissures where toothbrush bristles cannot reach. This creates a physical barrier to decay.
Which teeth are most commonly sealed in preventive dentistry?
- A Maxillary canines
- B Mandibular incisors
- C Premolars
- D Permanent molars
Correct answer: Permanent molars
Permanent molars have deep pits and fissures that are highly caries-prone. They are the primary candidates for sealants.
Which step must be performed immediately before applying a sealant?
- A Fluoride varnish application
- B Tooth etching with phosphoric acid
- C Polishing with coarse paste
- D Checking occlusion
Correct answer: Tooth etching with phosphoric acid
Etching creates microscopic porosity in enamel to allow sealant retention. It is a critical bonding step.
How should enamel appear after proper etching?
- A Glossy and smooth
- B Chalky and frosty
- C Yellow and sticky
- D Dark and shiny
Correct answer: Chalky and frosty
A frosty, chalky appearance indicates that the enamel has been conditioned for bonding. This ensures strong adhesion.
Which isolation method is most commonly used during sealant placement?
- A Rubber dam
- B Dry angles and cotton rolls
- C Gauze packing
- D High-speed suction only
Correct answer: Dry angles and cotton rolls
Dry angles and cotton rolls effectively control moisture during sealant procedures. Good isolation prevents bond failure.
What happens if saliva contaminates the etched tooth before sealant placement?
- A The sealant bonds better
- B The tooth becomes whiter
- C The enamel must be re-etched
- D The sealant will self-bond
Correct answer: The enamel must be re-etched
Saliva contamination interferes with bonding. Re-etching restores the enamel surface for proper adhesion.
Which material is most commonly used for pit and fissure sealants?
- A Zinc phosphate
- B Resin-based sealant
- C Glass ionomer cement only
- D Silicone-based coating
Correct answer: Resin-based sealant
Resin-based sealants provide strong retention and durable protection. They are widely used in preventive dentistry.
Which curing device is used for light-cured sealants?
- A Electric scaler
- B LED curing light
- C Amalgam carrier
- D Prophy jet
Correct answer: LED curing light
LED curing lights polymerize resin-based sealants. Proper curing ensures the sealant hardens and bonds adequately.
Which factor most affects sealant retention?
- A Tooth shade
- B Proper isolation and dry environment
- C Type of toothbrush used at home
- D Patient’s age
Correct answer: Proper isolation and dry environment
Moisture control is essential for sealant bonding. Even slight contamination can cause sealant failure.
Which step is recommended before etching the tooth for sealant application?
- A Applying fluoride gel
- B Cleaning the occlusal surface with non-fluoride pumice
- C Using high-speed polishing paste
- D Performing a gingivectomy
Correct answer: Cleaning the occlusal surface with non-fluoride pumice
Non-fluoride pumice removes plaque and debris without interfering with bonding. Fluoridated products may inhibit retention.
Why should sealants be placed soon after tooth eruption?
- A Caries risk is highest in newly erupted teeth
- B The tooth is easier to whiten earlier
- C Sealants bond only to baby teeth
- D Occlusion cannot be checked later
Correct answer: Caries risk is highest in newly erupted teeth
New molars have immature enamel and deep grooves prone to decay. Early sealing prevents caries formation.
Which type of sealant releases fluoride and is helpful for partially erupted teeth?
- A Resin composite sealant
- B Glass ionomer sealant
- C Zinc-based varnish
- D Temporary cement sealant
Correct answer: Glass ionomer sealant
Glass ionomer sealants bond in moist conditions and release fluoride. They are ideal for newly erupted teeth where isolation is difficult.
Which clinical factor indicates that a sealant may need to be replaced?
- A Stain buildup around gingiva
- B Partial loss or chipping of the sealant
- C Small areas of plaque left after brushing
- D Tooth mobility
Correct answer: Partial loss or chipping of the sealant
Sealants must fully cover pits and fissures to provide protection. Partial loss reduces effectiveness and requires repair.
What is the purpose of checking occlusion after sealant placement?
- A To see if the tooth is loose
- B To detect high spots that may fracture the sealant
- C To test bond strength directly
- D To evaluate pulp vitality
Correct answer: To detect high spots that may fracture the sealant
High occlusal points can cause premature wear or breakage. Adjustments ensure long-term sealant success.
Which condition is a contraindication for sealant placement?
- A Deep grooves on a tooth
- B Newly erupted molars
- C Approximal caries connecting to fissures
- D Children younger than age six
Correct answer: Approximal caries connecting to fissures
Sealants should not be placed over cavitated lesions. Caries must be treated before sealing the surface.
Why should patients avoid chewing hard foods immediately after sealant placement?
- A Sealants cause temporary numbness
- B Newly cured sealants may fracture until fully set
- C Sealants soften enamel
- D Sealants interfere with saliva flow
Correct answer: Newly cured sealants may fracture until fully set
Although cured, sealants benefit from avoiding excessive force immediately after placement. This prevents chipping.
Which sign indicates successful sealant retention during follow-up appointments?
- A Sealant appears glossy and fully covers fissures
- B Tooth appears darker
- C Presence of food debris
- D Pain during chewing
Correct answer: Sealant appears glossy and fully covers fissures
A well-retained sealant is intact, glossy, and fully covers pits and fissures. This ensures continued caries protection.
Which material is used to re-seal small areas of sealant loss?
- A Non-fluoride pumice
- B Etchant and new resin sealant
- C Temporary filling material
- D Glass beads
Correct answer: Etchant and new resin sealant
Small sealant defects can be repaired by re-etching and adding new resin. This restores protection without full removal.
What is the recommended action if a tooth has questionable grooves but no caries activity?
- A Place a preventive sealant
- B Wait one year to evaluate again
- C Prepare the tooth for restoration
- D Perform a full crown
Correct answer: Place a preventive sealant
Sealants are recommended for high-risk or questionable grooves to prevent caries. This is a minimally invasive preventive approach.
Which factor most increases the likelihood of sealant failure?
- A Excessive curing time
- B Moisture contamination during placement
- C Using a new curing light
- D Applying two thin layers
Correct answer: Moisture contamination during placement
Moisture is the leading cause of sealant failure. Strict isolation is essential for successful bonding.