MCQs on Bleaching of Teeth

# Discoloration of tooth in tetracycline therapy is due to the formation of:
A. Calcium orthophosphate
B. Dicalcium phosphate dihydrate
C. Calcium oxide
D. Tetracalcium phosphate

# Microabrasion is a procedure in clinical orthodontics performed to:
A. Clean the bracket base
B. Clean the archwire
C. Polishing the bracket
D. Removal of white spot lesions


# Dentist prescribed home applied bleaching technique uses:
A. 35% hydrogen peroxide
B. 10% carbamide peroxide
C. 18% hydrochloric acid
D. Sodium perborate



# Minimum dosage of tetracycline which will show tooth discoloration is:
A. 5 mg/kg bodyweight
B. 20 mg/kg bodyweight
C. 50 mg/kg bodyweight
D. 80 mg/kg bodyweight

# Till what age tetracycline should not be given to prevent discoloration?
A. 3 year
B. 8 year
C. 12 year
D. 18 year

# Glass ionomer cement is used as a barrier over gutta percha filling before bleaching an endodontically treated discolored tooth to:
A. prevent bleaching agent from dissolving gutta percha
B. prevent percolation of the bleaching agent into the apical area
C. prevent contamination of bleaching agent
D. prevent discoloration of tooth from obturating material

# Bleaching is indicated in which of the following clinical situations?
A. Dentin discolorations
B. Teeth with discolored composites
C. Tooth discoloration due to caries
D. Teeth with superficial discolorations

# A 20 year old female patient comes to the clinic with discoloration of the upper right central incisor. This tooth was intact and otherwise asymptomatic.The common sequel following bleaching non vital teeth is:
A. Ankylosis
B. Periodontal pathology
C. External cervical resorption
D. Reinfection

# A 20 year old female patient comes to the clinic with discoloration of the upper right central incisor. This tooth was intact and otherwise asymptomatic.The treatment most often employed for managing discoloration in a non vital tooth is:
A. Microabrasion
B. Walking bleach
C. Over the counter bleaching
D. Veneer

# A 20 year old female patient comes to the clinic with discoloration of the upper right central incisor. This tooth was intact and otherwise asymptomatic. The most likely cause for the discoloration in this patient would be:
A. pulp necrosis
B. dental resorption
C. internal resorption
D. microleakage

# Following intracoronal bleaching immediate composition restoration was required, what has to be done?
A. Treat with catalase
B. Wait for 7 days is mandatory
C. Treat with H2O2 for 3 minutes
D. Not possible

# The 'in office' non vital bleaching technique is:
A. Walking bleach
B. Power bleach technique
C. Thermo catalytic technique
D. Night guard technique


# Which one of the following is used to bleach a discolored endodontically treated tooth?
A. Ether
B. Chloroform
C. Superoxol
D. Sodium hypochlorite

# Which of the following is not responsible for endogenous staining of teeth during development?
A. Tetracycline
B. Rh incompatibility
C. Neonatal liver diseases
D. Vitamin C deficiency

# In case of bleaching technique to remove fluorosis stains:
A. 17% ether removes the surface debris
B. 36% hydrochloride acid etches the enamel
C. 30% H2O2 bleaches the enamel
D. All of the above correct

# Discoloration of the teeth results from:
A. Decomposition of the pulp
B. Filling materials
C. Hemorrhage following pulp extirpation
D. All of the above

# The bleaching material used for night guard vital tooth bleaching is:
A. Superoxol
B. Anesthetic ether and hydrochloric acid
C. Sodium bicarbonate
D. Carbamide peroxide

# Night guard bleaching refers to:
A. Laser activated bleaching
B. Dentist prescribed home applied technique
C. Thermo bleaching
D. Photo bleaching

# A 12 year old child comes to your clinic with a history of long term use of tetracycline. The anterior teeth are mild yellowish brown. What method would you use to remove the stain?
A. Hydrochloric acid pumice microabrasions
B. At home bleaching method
C. Superoxol with or without heat
D. Composite resin veneers

# Vital bleaching causes:
A. Internal resorption
B. Cervical resorption
C. External resorption
D. Periapical periodontitis

# Carbamide solution used for bleaching degrades into:
A. 0.3% sodium perborate
B. 30% hydrogen peroxide
C. 3% hydrogen peroxide
D. 30% sodium perborate

# Tooth discoloration is due to:
A. Acute pulpal abscess
B. Pulpal hyperemia
C. Pulpal death
D. None of the above

# When undertaking bleaching of vital teeth, all of the following are done except:
A. Prophylaxis
B. Use of eye protective glasses
C. Use of local anesthesia
D. Polishing after treatment

# In the walking bleach technique:
A. It uses a heat treatment
B. It requires the patient to report in 24 hours
C. Can be done with 35 percent hydrogen peroxide
D. It uses a mixture of sodium perborate and hydrogen peroxide

# Home bleach is also called as:
A. Walking bleach
B. Thermocatalytic bleach
C. Power bleach
D. All of the above

# Superoxol is:
A. 30% H2O2
B. Combination of H2O2 + Sodium perborate
C. Combination of Hcl+H2O2
D. None of the above

# The most common consequence of bleaching non vital teeth is:
A. Discoloration
B. Cervical resorption
C. Apical Periodontitis
D. Root resorption