Deck 3: Preventive Dental Materials

Question 1

Benzoyl peroxide is the:

A) initiator of a one-component sealant system.
B) initiator of a two-component sealant system.
C) inorganic filler.
D) organic amine accelerator of a one-component sealant system.
E) monomer.

Answer 1

initiator of a two-component sealant system.

Question 2

Thixotropic means the:

A) viscosity of the material is changeable.
B) material will adhere to an intraoral surface.
C) setting time of the material is affected by glove powder.
D) grain size of cast gold is affected by quenching.

Answer 2

viscosity of the material is changeable.

Question 3

Which type of fluoride treatment is best to use for a patient with dentinal hypersensitivity (has a neutral pH)?

A) Acidulated phosphate fluoride
B) Sodium fluoride
C) Stannous fluoride
D) A and C
E) B and C

Answer 3

Sodium fluoride

Question 4

Approximately ____% of dental caries in children 5 to 17 years of age involves pits.

A) 11
B) 24
C) 49
D) 74
E) 84

Question 5

Which type of fluoride will not etch restorations?

A) Acidulated phosphate fluoride
B) Stannous fluoride
C) Sodium fluoride
D) A and B
E) B and C

Question 6

Current evidence indicates that sealants should not be used on the teeth of a patient:

A) who cooperates in maintaining good oral hygiene.
B) who has pits and fissures on occlusal surfaces.
C) who has been free of caries for several years.
D) with no proximal lesions.

Question 7

Which of the following statements is true of 4-minute versus 1-minute application of a fluoride treatment? A 4-minute application is:

A) less effective than a 1-minute application.
B) equally effective as a 1-minute application.
C) more effective than a 1-minute application.
D) not currently recommended.

Question 8

Acid etching of the enamel surface improves the retention of sealant by:

A) cleaning the area to be sealed.
B) improving the wettability of the enamel.
C) increasing the surface area.
D) A, B, and C.
E) both A and C.

Question 9

A preventive resin restoration involves the use of _____ to restore the teeth.

A) flowable composite
B) compomer
C) hybrid ionomer
D) glass ionomer
E) ceramic

Question 10

Which of the following is considered to be a preventive dental material?

A) Dental amalgam
B) Pit and fissure sealant
C) Ceramic veneer
D) Full gold crown

Question 11

Which of the following statements is true of the pit and fissure?

A) It is a smooth-based depression on the occlusal surface of a tooth.
B) It may be cleansed by the excursion of food or a toothbrush bristle.
C) It is the result of noncoalescence of enamel during tooth formation.
D) It is the result of noncoalescence of dentin during tooth formation.

Question 12

Fluoride varnishes are available that contain _____ fluoride.

A) 1% sodium
B) 5% sodium
C) 1% stannous
D) 5% stannous
E) 2.34% acidulated phosphate-fluoride (APF)

Question 13

Etchants are generally _____ acid.

A) hydrochloric
B) acetic
C) phosphoric
D) salicylic

Question 14

The results of a clinical study after a single application of a pit and fissure sealant indicated that after five years,sealant effectiveness:

A) increased.
B) decreased.
C) remained unchanged.
D) was tied to oral hygiene.

Question 15

Application of fluoride is least effective in preventing caries on which of the following surfaces of posterior teeth?

A) Mesial
B) Distal
C) Buccal
D) Lingual
E) Occlusal

Question 16

The chemistry of sealants is similar to:

A) acidulated phosphate-fluoride (APF).
B) composite restorative material.
C) ceramic restorative material.
D) glass ionomer cement.

Question 17

Pit and fissure sealants may be used to prevent caries in _____ teeth.

A) deciduous but not permanent
B) permanent but not deciduous
C) both deciduous and permanent
D) neither deciduous nor permanent

Question 18

Which of the following statements is true of the manipulation of fluoride foams and gels during their application for office fluoride treatment?

A) They should be applied prior to dental prophylaxis.
B) The teeth are to be kept as free from saliva as possible before application of the tray.
C) The troughs of the maxillary and mandibular trays should be completely filled with the gel.
D) After application of the gel, the patient is instructed not to eat for 4 hours.
E) Rinses are recommended for children under six years old.

Question 19

Which type of fluoride can stain restorations?

A) Stannous fluoride
B) Sodium fluoride
C) Acidulated phosphate fluoride
D) A, B, and C
E) A and C

Question 20

Sealants polymerized by visible light are ___-component systems that _____ require mixing.

A) one; do
B) one; do not
C) two; do
D) two; do not

Question 21

Of the following,which would not be a sign of mouth-protector deterioration?

A) Bite-through
B) Tearing
C) Discoloration
D) General wear

Question 22

Sealants are polymerized by using a(n)_____ spectrum light.

A) ultraviolet.
B) incandescent.
C) fluorescent.
D) visible.

Question 23

If teeth become contaminated with saliva after they are etched,the operator should:

A) rinse the area again and dry it.
B) re-etch, rinse, and dry.
C) use the high velocity suction to dry.
D) add more cotton rolls for moisture control.

Question 24

Used to help prevent caries in the pits and fissures of posterior teeth,sealants are composed of:

A) polymers.
B) glass ionomers.
C) acrylic.
D) ceramic.

Question 25

Which of the following statements is(are)true of custom-made mouth protectors?

A) Athletes prefer the custom-made mouth protector over mouth-formed and stock mouth protectors.
B) Custom-made mouth protectors are more expensive than mouth-formed or stock mouth protectors.
C) Custom-made mouth protectors are less likely to interfere with speech than mouth-formed or stock mouth protectors.
D) A, B and C are true.
E) A and C are true.

Question 26

Neutral sodium fluoride is used for patients with composites,ceramics,and glass ionomers,because it will not _____ esthetic restorations.

A) stain
B) etch
C) marginate
D) remineralize

Question 27

Surveys report that orofacial injuries most frequently occur in _____ when the athlete is not wearing a mouth protector.

A) basketball
B) hockey
C) football
D) skiing
E) golf

Question 28

Which of the following represents the correct sequential order for manipulation of pit and fissure sealants that require etching with phosphoric acid?
1)Cleansing and etching the occlusal surfaces
2)Drying the occlusal surfaces
3)Washing the occlusal surfaces
4)Finishing the occlusal surfaces
5)Polymerizing
6)Applying sealant to the pits and fissures

A) 2, 1, 3, 4, 6, 5
B) 1, 2, 4, 3, 5, 6
C) 1, 3, 2, 6, 4, 5
D) 1, 3, 2, 6, 5, 4
E) 3, 1, 2, 6, 4, 5

Question 29

Identify four criteria for not using a pit and fissure sealant.

Question 30

A mouth protector thickness of _____ mm of material over incisal edges and cusps of teeth is recommended for best protection and acceptable comfort.

A) 0.5
B) 1.0
C) 2.0
D) 4.0
E) 8.0

Question 31

______ fluoride may be responsible for depositing stains on teeth and restorations.

A) Stannous
B) Acidulated phosphate
C) Neutral sodium
D) Sodium

Question 32

Neutral fluoride gels contain thickening agents and are considered:

A) viscous
B) flowable
C) wetting
D) thixotropic

Question 33

As the thickness of mouth protector material increases,the energy forces _____,and the transmitted forces _____.

A) increase; decrease
B) increase; increase
C) decrease; increase
D) decrease; decrease

Question 34

Discuss the significance of placing a pit and fissure sealant over existing caries.

Question 35

Fluoride rinses should not be used for:

A) children under 6 years of age.
B) orthodontic patients.
C) home preventive care.
D) all of the above.

Question 36

Teeth should be etched with a _____ phosphoric solution for _____ seconds.

A) 18%; 15
B) 23%; 30
C) 37%; 60
D) 42%; 45

Question 37

It can be difficult to fill a fissure completely with sealant due to _____ trapped in the fissure.

A) air
B) debris
C) moisture
D) all of the above

Question 38

Eighty-five percent of dental caries on posterior teeth of children ages 5 to 17 occur on which surface?

A) Mesial
B) Distal
C) Buccal
D) Occlusal
E) Lingual

Question 39

During placement of sealant:

A) if an etched tooth becomes contaminated with saliva, the etching and rinsing steps need not be repeated.
B) the self-cured sealant is cured with a light source for at least 20 seconds.
C) moisture enhances retention of the sealant by the fissure.
D) a small cotton pellet may be used to remove sealant that has failed to polymerize because of exposure to air.
E) if a fluoride treatment is used in conjunction with the pit and fissure sealant, the fluoride treatment is applied before the sealant has polymerized.