Dental Materials Properties And Manipulation 10th Edition by John M. Powers – Test Bank
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Sample Test
Powers: Dental Materials, 10th Edition
Chapter 03: Preventive Dental Materials
Test Bank
MULTIPLE CHOICE
1. 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 |
ANS: B
|
|
Feedback |
|
A |
Dental amalgam is
considered to be a restorative dental material. |
|
B |
Fluoride gels, pit and
fissure sealants, and mouth protectors are considered to be preventive dental
materials. |
|
C |
Porcelain veneers are
considered to be a restorative dental material. |
|
D |
Full gold crowns are
considered to be a restorative dental material. |
REF: Pg. 29
2. 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 |
ANS: B
|
|
Feedback |
|
A |
Acidulated phosphate does
not have a neutral pH. |
|
B |
Sodium fluoride has a
neutral pH. |
|
C |
Stannous fluorides have
acidic values of pH. |
|
D |
A and C are incorrect
answers. |
|
E |
B is a correct answer, and
C is an incorrect answer. |
REF: Pg. 28
3. 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 |
ANS: C
|
|
Feedback |
|
A |
Acidulated phosphate
fluorides can etch restorations. |
|
B |
Stannous fluorides can etch
restorations. |
|
C |
Sodium fluoride will not
etch restorations. |
|
D |
A and C are incorrect
answers. |
|
E |
B is an incorrect answer,
and C is a correct answer. |
REF: Pg. 28
4. 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 |
ANS: A
|
|
Feedback |
|
A |
Stannous fluoride can stain
restorations. |
|
B |
Sodium fluoride does not
stain restorations. |
|
C |
Acidulated phosphate
fluoride does not stain restorations. |
|
D |
A is the only correct
choice. |
|
E |
A is the only correct
choice. |
REF: Pg. 28
5. 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. |
ANS: A
|
|
Feedback |
|
A |
Thixotropic means the
viscosity of the material is changeable. Examples found in dentistry include
one form of topical dental anesthetic. Yogurt is another example of a
thixotropic material. |
|
B |
The material does not have
adhesive properties. |
|
C |
There is no chemical or
setting reaction involved. |
|
D |
Quenching is the process of
rapidly cooling cast gold. |
REF: Pg. 28
6. 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) |
ANS: B
|
|
Feedback |
|
A |
1% sodium is related to gel
deliveries of acidulated phosphate fluoride. |
|
B |
Fluoride varnishes are
available that contain 5% sodium fluoride. |
|
C |
Because it stains, 1%
stannous is rarely used. |
|
D |
Because it stains, 5%
stannous is rarely used. |
|
E |
2.34% APF is related to gel
deliveries of acidulated phosphate fluoride. |
REF: Pg. 28
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. |
ANS: C
|
|
Feedback |
|
A |
A 4-minute application is
necessary for full fluoride uptake. |
|
B |
A 4-minute application is
necessary for full fluoride uptake. |
|
C |
A 4-minute application
appears to be more effective than a 1-minute application. |
|
D |
A 4-minute application is
necessary for full fluoride uptake. |
REF: Pg. 29
8. 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. |
ANS: B
|
|
Feedback |
|
A |
They should be applied
after rather than before dental prophylaxis. |
|
B |
The teeth are to be kept as
free from saliva as possible before application of the tray during the
application of office fluoride treatments. |
|
C |
A ribbon of gel should be
placed in the troughs of the maxillary and mandibular trays. |
|
D |
After application of the
gel, the patient is instructed not to eat for 30 minutes. |
|
E |
Rinses are not recommended
for children under six years old. |
REF: Pg. 29
9. 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 |
ANS: E
|
|
Feedback |
|
A |
Mesial involves smooth
surfaces where fluoride is most effective. |
|
B |
Distal involves smooth
surfaces where fluoride is most effective. |
|
C |
Buccal involves smooth
surfaces where fluoride is most effective. |
|
D |
Lingual involves smooth
surfaces where fluoride is most effective. |
|
E |
Application of fluoride is
least effective in pits and fissures as a result of the special anatomy of
the occlusal surfaces of posterior teeth. |
REF: Pg. 28
10. 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. |
ANS: C
|
|
Feedback |
|
A |
It is a narrow, deep
depression. |
|
B |
Pits and fissures may be
very narrow, smaller than a single toothbrush bristle. |
|
C |
The pit and fissure is an
enamel fault that is the result of noncoalescence of enamel during tooth
formation. The noncoalescence may extend to the dentoenamel junction or it
may be incomplete. |
|
D |
It may extend as far as the
dentoenamel junction. |
REF: Pg. 29
11. Approximately
____% of dental caries in children 5 to 17 years of age involves pits.
|
A. |
11 |
|
B. |
24 |
|
C. |
49 |
|
D. |
74 |
|
E. |
84 |
ANS: E
|
|
Feedback |
|
A |
Eleven is a low random
distracter. |
|
B |
Twenty-four is a low random
distracter. |
|
C |
Forty-nine is low random
distracter. |
|
D |
Seventy-four is a low
random distracter. |
|
E |
Approximately 84% of dental
caries in children 5 to 17 years of age involves pits. |
REF: Pg. 29
12. 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 |
ANS: C
|
|
Feedback |
|
A |
This option is incorrect
based on the answers of both. |
|
B |
This option is incorrect
based on the answers of both. |
|
C |
Pit and fissure sealants
may be used to prevent caries in both deciduous and permanent teeth. |
|
D |
This option is incorrect
based on the answers of both. |
REF: Pg. 29
13. 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 |
ANS: A
|
|
Feedback |
|
A |
A preventive resin
restoration involves the use of flowable composite to restore the teeth. |
|
B |
Compomer is a thick
material with little to no flow. |
|
C |
Hybrid ionomer is a thick
material with little to no flow |
|
D |
Glass ionomer is a thick
material with little to no flow. |
|
E |
Ceramic is used for
indirect restorations only. |
REF: Pg. 29
14. The
chemistry of sealants is similar to:
|
A. |
acidulated
phosphate-fluoride (APF). |
|
B. |
composite restorative
material. |
|
C. |
ceramic restorative
material. |
|
D. |
glass ionomer cement. |
ANS: B
|
|
Feedback |
|
A |
APF is a fluoride. |
|
B |
The chemistry of sealants
is similar to composite restorative material. Sealants have fewer filler
particles and are more fluid in order to penetrate pits and fissures in
addition to the etched areas produced on the enamel. |
|
C |
Ceramic is an indirect
restorative material. |
|
D |
Glass ionomer is a cement
with a fluoride ion. |
REF: Pg. 29
15. 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 |
ANS: B
|
|
Feedback |
|
A |
A one-component system does
not require mixing. |
|
B |
Sealants polymerized by
visible light are one-component systems that do not require mixing. |
|
C |
Sealants that self-cure are
two-component systems that do require mixing. |
|
D |
Sealants that self-cure are
two-component systems that do require mixing. |
REF: Pg. 29
16. 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. |
ANS: B
|
|
Feedback |
|
A |
Diketone is the initiator
in a one-component system. |
|
B |
Benzoyl peroxide is the
initiator of a two-component sealant system. |
|
C |
Inorganic material is
present in one- and two-component systems. |
|
D |
Organic amine accelerator
is present in one- and two-component systems. |
|
E |
Monomer is only present in
a one-component system. |
REF: Pg. 30
17. 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. |
ANS: D
|
|
Feedback |
|
A |
All three choices of
materials are correct. |
|
B |
All three choices of
materials are correct. |
|
C |
All three choices of
materials are correct. |
|
D |
Acid etching of the enamel
surface improves the retention of sealant by cleaning the area to be sealed,
improving the wettability of the enamel, increasing the surface area, and
forming spaces into which the sealant can penetrate to form tags. |
|
E |
All three choices of
materials are correct. |
REF: Pg. 30
18. 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. |
ANS: B
|
|
Feedback |
|
A |
The clinical study found
the effectiveness of a single application of a sealant clearly decreases with
time. |
|
B |
The clinical study found
the effectiveness of a single application of a sealant clearly decreases with
time. |
|
C |
The clinical study found
the effectiveness of a single application of a sealant clearly decreases with
time. |
|
D |
Caution is warranted in
comparison of some of these studies, because materials, techniques, teeth
studied, and clinical criteria for judging success or failure vary from study
to study. |
REF: Pg. 31
19. 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. |
ANS: C
|
|
Feedback |
|
A |
Sealants also should not be
used on the teeth of a patient who does not cooperate in maintaining good
oral hygiene. |
|
B |
Sealants should be used on
occlusal surfaces where pits and fissures exist. |
|
C |
Current evidence indicates
that sealants should not be used on the teeth of a patient who has been free
of caries for several years. |
|
D |
Sealants should not be used
on teeth with many proximal lesions. |
REF: Pg. 31
20. Etchants
are generally _____ acid.
|
A. |
hydrochloric |
|
B. |
acetic |
|
C. |
phosphoric |
|
D. |
salicylic |
ANS: C
|
|
Feedback |
|
A |
Hydrochloric acid is not
used to etch enamel. |
|
B |
Acetic acid is not used to
etch enamel. |
|
C |
Etchants are generally 37%
solutions of phosphoric acid in water. |
|
D |
Salicylic acid is not used
to etch enamel. |
REF: Pg. 31
21. 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. |
ANS: D
|
|
Feedback |
|
A |
The area must be re-etched
and dried again. |
|
B |
Self-cured sealant does not
require a light to cure. |
|
C |
Moisture inhibits retention
of the sealant. |
|
D |
If an etched tooth becomes
contaminated with saliva, the etching and rinsing steps are repeated. |
|
E |
If a fluoride treatment is
used in conjunction with the pit and fissure sealant, the treatment is
applied after the sealant has polymerized. |
REF: Pg. 32
22. 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 |
ANS: A
|
|
Feedback |
|
A |
Orofacial injuries most
commonly occur in basketball, baseball, and soccer. Most injuries occur when
the athlete does not wear a mouth protector. The Centers for Disease Control
and Prevention (CDC) recommends that all players of contact sports use mouth
protectors. |
|
B |
The CDC found that hockey
players do not sustain as many orofacial injuries as other athletes do
because of required faceguards and mouth protectors. Most junior colleges and
many amateur hockey and football leagues have adopted the rule mandated by the
National Football Alliance Rules Committee that all high school athletes be
equipped with internal mouth protectors. |
|
C |
The CDC found that football
players do not sustain as many orofacial injuries as other athletes do
because of required faceguards and mouth protectors. Most junior colleges and
many amateur hockey and football leagues have adopted the rule mandated by
the National Football Alliance Rules Committee that all high school athletes
be equipped with internal mouth protectors. |
|
D |
Skiers do not sustain as
many orofacial injuries as other athletes. |
|
E |
Golfers do not sustain as
many orofacial injuries as other athletes. |
REF: Pg. 32
23. 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. |
ANS: D
|
|
Feedback |
|
A |
All three answers are
correct. |
|
B |
All three answers are
correct. |
|
C |
All three answers are
correct. |
|
D |
Athletes prefer the custom-made
mouth protector over mouth-formed and stock mouth protectors; custom-made
mouth protectors are more expensive than mouth-formed or stock mouth
protectors; and custom-made mouth protectors are less likely to interfere
with speech than mouth-formed or stock mouth protectors. |
|
E |
All three answers are
correct. |
REF: Pg. 34
24. 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 |
ANS: D
|
|
Feedback |
|
A |
This answer provides
insufficient thickness. |
|
B |
This answer provides
insufficient thickness. |
|
C |
This answer provides
insufficient thickness. |
|
D |
A thickness of 4 mm of
material over incisal edges and cusps of teeth is recommended for best
protection and acceptable comfort. |
|
E |
This answer provides
excessive thickness. |
REF: Pg. 34
25. Which
of the following represents the correct sequential order for manipulation of
pit and fissure sealants that require etching with phosphoric acid?
26. Cleansing
and etching the occlusal surfaces
27. Drying
the occlusal surfaces
28. Washing
the occlusal surfaces
29. Finishing
the occlusal surfaces
30. Polymerizing
31. 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 |
ANS: D
|
|
Feedback |
|
A |
The correct order of
sequential steps is cleansing and etching the occlusal surfaces, washing the
occlusal surfaces, drying the occlusal surfaces, applying sealant to the pits
and fissures, polymerizing, and finishing. |
|
B |
The correct order of
sequential steps is cleansing and etching the occlusal surfaces, washing the
occlusal surfaces, drying the occlusal surfaces, applying sealant to the pits
and fissures, polymerizing, and finishing. |
|
C |
The correct order of
sequential steps is cleansing and etching the occlusal surfaces, washing the
occlusal surfaces, drying the occlusal surfaces, applying sealant to the pits
and fissures, polymerizing, and finishing. |
|
D |
The correct order of
sequential steps is cleansing and etching the occlusal surfaces, washing the
occlusal surfaces, drying the occlusal surfaces, applying sealant to the pits
and fissures, polymerizing, and finishing. |
|
E |
The correct order of
sequential steps is cleansing and etching the occlusal surfaces, washing the
occlusal surfaces, drying the occlusal surfaces, applying sealant to the pits
and fissures, polymerizing, and finishing. |
REF: Pg. 35
26. 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. |
ANS: A
|
|
Feedback |
|
A |
Pit and fissure sealants
are polymers applied to the occlusal surfaces of posterior teeth to prevent
pit and fissure caries. |
|
B |
Glass ionomers are cements. |
|
C |
Acrylics are used to make
complete dentures, portions of removable partial dentures, temporary crowns,
custom impression trays, and denture teeth. |
|
D |
Ceramics are used in
indirect restorations. |
REF: Pg. 28
27. 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 |
ANS: B
|
|
Feedback |
|
A |
Stannous fluoride stains. |
|
B |
With neutral sodium
fluoride the pH is adjusted to be between 6 and 8. Values of pH in this range
should minimize acid etching of restorative materials, such as composites, compomers,
resin-modified glass ionomers, glass ionomers, and ceramics, caused by more
acidic APF gels. |
|
C |
The gel is neutral and
therefore safe for esthetic restorations. |
|
D |
Some fluoride varnishes
contain ACP remineralization properties. |
REF: Pg. 28
28. Neutral
fluoride gels contain thickening agents and are considered:
|
A. |
viscous |
|
B. |
flowable |
|
C. |
wetting |
|
D. |
thixotropic |
ANS: D
|
|
Feedback |
|
A |
Viscosity is related to the
thickness or thinness of a material and/or surface tension. |
|
B |
Flowable is related to the
thickness or thinness of a material and/or surface tension. |
|
C |
Wetting is related to the
thickness or thinness of a material and/or surface tension. |
|
D |
Neutral sodium fluoride
foams, gels, and rinses are available. One product is thixotropic and
contains sodium fluoride and thickening agents. |
REF: Pg. 28
29. ______
fluoride may be responsible for depositing stains on teeth and restorations.
|
A. |
Stannous |
|
B. |
Acidulated phosphate |
|
C. |
Neutral sodium |
|
D. |
Sodium |
ANS: A
|
|
Feedback |
|
A |
Stannous fluoride products
are effective in providing fluoride but can cause staining of tooth surfaces
and restorations. |
|
B |
Acidulated phosphate is
used as an alternative to stannous fluoride because it does not stain. |
|
C |
Neutral sodium is used as
an alternative to stannous fluoride because it does not stain. |
|
D |
Sodium fluoride is used as
an alternative to stannous fluoride because it does not stain. |
REF: Pg. 28
30. 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. |
ANS: A
|
|
Feedback |
|
A |
Rinses are not recommended
for children younger than 6 years. |
|
B |
Fluoride rinses are often
recommended for patients who need a fluoride boost in between office
treatments, that is, patients in active orthodontic treatments and
individuals with specific fluoride needs. |
|
C |
Fluoride rinses are often
recommended for patients who need a fluoride boost in between office
treatments, that is, patients in active orthodontic treatments and
individuals with specific fluoride needs. |
|
D |
Fluoride rinses are often
recommended for patients who need a fluoride boost in between office
treatments, that is, patients in active orthodontic treatments and
individuals with specific fluoride needs. |
REF: Pg. 29
31. Sealants
are polymerized by using a(n) _____ spectrum light.
|
A. |
ultraviolet. |
|
B. |
incandescent. |
|
C. |
fluorescent. |
|
D. |
visible. |
ANS: D
|
|
Feedback |
|
A |
Ultraviolet light sources
may affect the surface setting of resin materials. However, the optimum
response comes from the visible light spectrum. |
|
B |
Incandescent light sources
may affect the surface setting of resin materials. However, the optimum
response comes from the visible light spectrum. |
|
C |
Fluorescent light sources
may affect the surface setting of resin materials. However, the optimum
response comes from the visible light spectrum. |
|
D |
Sealants polymerized by
visible light (490 nm wavelength) are one-component systems that require no
mixing. |
REF: Pgs. 3-8
32. 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 |
ANS: D
|
|
Feedback |
|
A |
All answers are correct. |
|
B |
All answers are correct. |
|
C |
All answers are correct. |
|
D |
Filling the fissure
completely is difficult because air frequently is trapped in the bottom of
the fissure, or the accumulation of debris and moisture at the base of the
fissure prevents it from being sealed completely. |
REF: Pg. 29
33. 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 |
ANS: D
|
|
Feedback |
|
A |
Mesial are smooth surfaces
and are not as susceptible to formation of caries. |
|
B |
Distal are smooth surfaces
and are not as susceptible to formation of caries. |
|
C |
Buccal are smooth surfaces
and are not as susceptible to formation of caries. |
|
D |
The unusual anatomy of the
pit and fissure causes such sites to exhibit a high incidence of dental
caries. In fact, 84% of dental caries in children 5 to 17 years of age
involve pits. |
|
E |
Lingual are smooth surfaces
and are not as susceptible to formation of caries. |
REF: Pg. 29
34. Teeth
should be etched with a _____ phosphoric solution for _____ seconds.
|
A. |
18%; 15 |
|
B. |
23%; 30 |
|
C. |
37%; 60 |
|
D. |
42%; 45 |
ANS: C
|
|
Feedback |
|
A |
Etch material is dispensed
at 37% dilution. It takes approximately 60 seconds to obtain an adequate
etch. |
|
B |
Etch material is dispensed
at 37% dilution. It takes approximately 60 seconds to obtain an adequate
etch. |
|
C |
Etchants are generally 37%
solutions of phosphoric acid in water. The solution is left on the tooth for
60 seconds before the surface is washed with a liberal amount of water for at
least 15 seconds. |
|
D |
Etch material is dispensed
at 37% dilution. It takes approximately 60 seconds to obtain an adequate
etch. |
REF: Pg. 31
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