Chapter 08 Teeth Whitening Materials and Procedures

Chapter 08  Teeth Whitening Materials and Procedures

Complete Chapter Questions And Answers
 

Sample Questions

MULTIPLE CHOICE

1. Which of the following statements is true regarding teeth bleaching?
a.
All teeth bleaching products contain peroxide.
b.
Teeth bleaching occurs when the bleaching material passes through the spaces in enamel and oxidizes the stains.
c.
Acid etching before the application of the bleach chemical may enhance penetration of the bleach.
d.
Acid etching will polish the surface of the enamel.

ANS: B
Teeth bleaching occurs when the bleaching material passes through the spaces in enamel and oxidizes the stains. Some bleaching products that do not contain peroxide are available. Some manufacturers have suggested that acid etching before application of the bleach chemical may enhance penetration of the bleach. Research has shown that this does not improve the bleaching. Etching may necessitate polishing the enamel before dismissal of the patient because of the surface roughness it creates.

REF: p. 117 TOP: Teeth Whitening (Bleaching) (How Whitening Works)

2. Which of the following statements is true regarding types of tooth stains?
a.
Intrinsic stains are on the tooth surface.
b.
All extrinsic stains can be removed by hand or ultrasonic scaling and coronal polishing.
c.
In general, yellow-brown discolorations are easier to bleach than blue-gray and black colors.
d.
Tetracycline derivatives such as minocycline will cause discoloration of teeth in children but not in adults.

ANS: C
In general, yellow-brown discolorations are easier to bleach than blue-gray and black colors. Extrinsic stains are on the tooth surface. Some extrinsic stains located on the surface can be removed, completely or in part, by hand or ultrasonic scaling and coronal polishing. Some stains have penetrated the enamel surface and cannot be polished or scaled away. Tetracycline derivatives such as minocycline can cause discoloration of teeth in adults as well as children.

REF: p. 117 TOP: Teeth Whitening (Bleaching) (Intrinsic Stains)

3. Sodium peroxyborate monohydrate (Amosan) is utilized with _____ bleaching.
a.
vital external
b.
vital internal
c.
devital external
d.
devital internal

ANS: D
Sodium peroxyborate monohydrate (Amosan) is utilized with devital internal bleaching. The sodium peroxyborate monohydrate and 30% hydrogen peroxide are sealed into the pulp chamber with a temporary restoration. With the paste, both products release oxygen that helps bleach the tooth. When the patient returns in 2 to 5 days, the bleaching material is removed and a composite or an amalgam restoration is placed.

REF: p. 119 TOP: Teeth Whitening (Bleaching) (Whitening of Nonvital Teeth)

4. Which of the following statements is true regarding home bleaching prescribed by the dentist?
a.
The material consists of clear, flexible strips containing a peroxide gel that are adapted over the teeth and worn for 30 minutes at a time once or twice a day.
b.
Only the anterior six teeth are covered.
c.
The gel is placed in a custom-formed soft, thin plastic tray and is worn by the patient for periods as short as 30 minutes twice daily or as long as overnight.
d.
The home bleaching process is less effective than the in-office process.

ANS: C
The gel is placed in a custom-formed soft, thin plastic tray and is worn by the patient for periods as short as 30 minutes twice daily or as long as overnight. The home bleaching process is as effective as the in-office process but takes much longer and is sometimes used as a follow-up to the in-office procedure that “jump-starts” the bleaching process. The material for over-the-counter (OTC) products consists of clear, flexible strips containing a peroxide gel that are adapted over the teeth and worn for 30 minutes at a time once or twice a day. The strips cover only the anterior six teeth in each arch, so patients who want to bleach additional teeth may need to resort to night guard bleaching or can purchase through the dental office special Crest Whitestrips that are longer and cover more teeth.

REF: p. 120
TOP: Teeth Whitening (Bleaching) (Home Whitening [Prescribed by the Dentist])