Test Questions Flashcards by Rustin Hawker

When placement of proximal retention locks in class II amalgam preparations is necessary, which of the following is not correct?

a. One should not undermine the proximal enamel.
b. One should not prepare locks entirely in the axial wall.
c. Even if deeper than ideal, one should use the axial wall as a guide for proximal lock placement.

d. One should place locks 0.2 mm inside the dentinoenamel junction (DEJ) to ensure
that the proximal enamel is not undermined.

D. One should place locks 0.2 mm inside the dentinoenamel junction (DEJ) to ensure that the proximal enamel is not undermined. correct answer is .5mm

WORNG its c. Even if deeper than ideal, one should use the axial wall as a guide for proximal lock placement.

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Many factors affect tooth/cavity preparation. Which of the following would be the least important factor?
Extent of the defect
Size of the tooth
Fracture lines
Extent of the old material

Size of the tooth

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In the conventional Class I composite preparation, retention is achieved by which of the following features?
a. Occlusal convergence
b. Occlusal bevel
c. Bonding
d. Retention grooves
b and d
a and c
a and d
b and c

b and c

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Restoration of an appropriate proximal contact results in all of the following except one. Which one is the exception?

Reduces or eliminates food impaction at the inter-dental papilla
Provides appropriate space for the interdental papilla
Provides increased retention form for the restoration
Maintains the proper occlusal relationship

Provides increased retention form for the restoration

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Bonding of resins to dentin is best described as involving \_\_\_\_\_\_\_.
Mechanical interlocking
Ionic bonding
Covalent bonding
Van der Waals forces

Mechanical interlocking

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Which of the following statements regarding the choice between doing a composite or amalgam restoration is true?

Establishing restored proximal contacts is easier with composite.
The amalgam is more difficult and technique-sensitive.
The composite generally uses a more conservative tooth/cavity preparation.
Only amalgam should be used for Class II restorations.

The composite generally uses a more conservative tooth/cavity preparation.

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Eburnated dentin has which of the following characteristics? (Choose all that apply.)

Is sclerotic dentin
Indicates recent poor hygiene
Usually appears as a white patch
Is firm to the touch of an explorer
Is usually seen in older patients

Is sclerotic dentin

Is firm to the touch of an explorer

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Rounding internal cavity preparation angles is part of what form in cavity preparation?

Resistance form
Retention form
Convenience form
Outline form

Resistance form

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For a mechanical pulp exposure that is non-carious and the exposure is less than 1.0 mm, what is usually the most appropriate treatment?

No pulp treatment
Direct pulp cap
Indirect pulp cap
Endodontic therapy

direct pulp cap

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After completing the tooth preparation for the application of an etch-and-rinse (total-etch) three-step dental adhesive, what is the next step?

Apply adhesive
Rinse etchant and leave surface wet
Apply two to three layers of primer
Etch enamel and dentin with phosphoric acid for 10 to 15 seconds
Light-cure

Etch enamel and dentin with phosphoric acid for 10 to 15 seconds

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Major differences between etch-and-rinse (previously known as total-etch) and self-etching primer adhesive systems include all of the following except one. Which one is the exception?

Time necessary to apply the materials
Amount of smear layer removed
Bond strengths to enamel
Need for wet bonding

Bond strengths to enamel, WRONG - its time

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From the following list, select the reasons associated with replacement of existing restorations. (Choose four).

a. Marginal ridge discrepancy that contributes to food impaction
b. Existing restoration has significant discrepancies and is a negative etiologic factor to adjacent teeth or tissue.
c. Light marginal staining not compromising esthetics and judged non-carious
d. Poor proximal contour or a gingival overhang that contributes to periodontal breakdown recurrent caries that can be adequately treated by a repair restoration
e. Presence of shallow ditching around an amalgam restoration
f. For tooth-colored restorations, unacceptable esthetics
g. for tooth colored restorations, unacceptable ethetics

a.
b.
d.
G

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Match each pulpal condition with the most closely linked recommended pulp therapy.

a. Mechanical pulp exposure, non-carious (1.0 mm) with purulent exudate ____
b. Remaining dentin thickness greater than 2.0 mm over vital pulp____
c. Carious pulp exposure (>1.0 mm) with purulent exudate ____
d. Residual questionable dentin near pulp, asymptomatic tooth____

e. Endodontic therapy
f. No pulp therapy required
g. Direct pulp cap
h. Indirect pulp cap

g.
f.
e.
h.

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When removing caries, which of the following layers of dentin are affected, but not infected, and therefore do not need to be removed?

Turbid dentin
Infected dentin
Transparent dentin
Normal dentin
Subtransparent dentin

Transparent dentin

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Another name for root surface caries is senile caries.
True
False

True

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When restoring a Class II or Class III lesion, it is important to create properly shaped embrasures for all of the following reasons, except:

Create a spillway for food during mastication
Make the teeth self-cleansing
Protect the gingival tissue, while also allowing stimulation of it
Provide arch stability

Provide arch stability

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When restoring the embrasures of posterior teeth the contact should be formed slightly buccal from center.
This will create a wider facial embrasure.

Both statements are true
Both statements are false
The first statement is true, the second is false
The first statement is false, the second is true

The first statement is true, the second is false

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Studies have established that root sensitivity is due, in part, to open dentinal tubules at the root surface.
The hydrodynamic theory is the proposed mechanism for this sensitivity.

Both statements are true
Both statements are false
The first statement is true, the second is false
The first statement is false, the second is true

Both statements are true

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On the first day in your solo private practice, you have a pulp exposure. Which of the following are favorable factors in avoiding root canal treatment?

It is a mechanical exposure of 1 mm
The tooth had never been symptomatic
The pulp appears pink
The hemorrhage is severe
It is a pinpoint carious exposure

The tooth had never been symptomatic

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Operator skill is less of a factor for composite resin restorations as compared to amalgam restorations.
True
False

Fasle

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What is the purpose of the clamp configuration?

Protecting the patient so they do not swallow the dam
Easy placement and holding the dam in place
A finger rest for the dentist
It is arbitrary

Easy placement and holding the dam in place

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Why is it important to have more than one tooth isolated by the dam?

To help with color matching of composite material
To assure proper orientation of the mouth and teeth
To help keep proper contacts and marginal ridge height
All of the above
B and C

All the above

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Which of these teeth are the most difficult to place rubber dam clamps on?

Teeth 18 or 31
Teeth 8 or 9
Teeth 24 or 25
Teeth 22 or 27

Teeth 18 or 31

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Why is it hard to place a rubber dam clamp on tooth #2 and #15 (assuming third molars are not present)?

The coronoid process gets in the way when the mouth is open
The further back in the mouth you get, the darker it gets
Gingival hyperplasia is much more common around those particular teeth
The unique shape of maxillary second molars makes it difficult for manufacturers to create a proper clamp to fit around them.

-The coronoid process gets in the way when the mouth is open

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Why are there so many different configurations of rubber dam clamps? - Some were invented specifically to reduce reflection of lighting back into the clinician's eyes - Teeth come in many different shapes and sizes, and so one size of clamp may be preferable to another when working with a particular tooth - Some are made "wingless" to mitigate bulk, making working around them easier for some dentists - Some are made with wings to provide extra retraction of the rubber dam from the field of operation - All of the above

All of the above

Tying floss to the clamp is used to help retrieve the clamp in case it comes off the tooth. It is also used to push the rubber dam down into the interproximal spaces. The first statement is TRUE. The second statement is FALSE. The first statement is FALSE. The second statement is TRUE. Both statements are TRUE. Both statements are FALSE.

The first statement is TRUE. The second statement is FALSE.

Another name for the corners of the mouth is __________. Philtrum Ala Commisure Vermillion Border

Commisure

The following is not a way to protect the lip while using a rubber dam: ``` Use water soluble lubricant Loosen dam Place 2x2s there Shaving cream Tighten the rubber dam frame ```

tighten the rubber dam on the frame

Why would a dentist put a rubber dam clamp gingival to the height of the contour? Because it's more exciting So that the clamp will stay in place It prevents gingivitis B and C

So that the clamp will stay in place

Which answer is not a purpose of the rubber dam? Prevent the restorative materials from entering the mouth Isolate the tooth from oral fluids Improve bonding quality Prevent the patient from talking

Prevent the patient from talking

An advantage of a winged-clamp compared to a wingless clamps is: Winged clamps are less painful for the patient Winged clamps can be used on both the maxilla and the mandible Winged clamps prevent tearing of the dam Winged clamps allow a dentist to carry the dam to the tooth and place the dam and clamp simultaneously

Winged clamps allow a dentist to carry the dam to the tooth and place the dam and clamp simultaneously

Why would you use floss on a clamp without wings? To push the clamp in between the interproximal space of two teeth To clean the tooth before performing restoration To prevent the clamp from going down the patient's throat To wedge between the teeth to hold the clamp more secure

To prevent the clamp from going down the patient's throat

What do you do if a patient comes in and they need a rubber dam for a procedure but they cannot breathe through their nose? Send the patient home until they can come back and breathe through their nose. Put the rubber dam at an angle or put 2 by 2 cotton gauze in to prop the dam. Don't use a dam. Just use cotton rolls wedged on all sides of the teeth you are working on. None of the above

2x2 cotton or just not use it

Why would you use a "wedjet" or part of the rubber dam as a wedge between teeth? To add thickness to the rubber dam To hold the rubber dam in place without a clamp To avoid hitting the neighboring tooth To make it more comfortable for the patient

To hold the rubber dam in place without a clamp

When punching holes in the rubber dam, punching the holes too close together can cause the dam to _______, while punching the holes too far apart can cause the dam to __________. Tear, bunch up Bunch up, tear

Tear, bunch up

What is a major challenge of dentin/enamel bonding?

The two tissues have different organic compositions. The dentin has a high amount of collagen whereas enamel is mostly mineralized. Designing a bonding material that can properly bond to the differing compositions is what is difficult. Enamel bonding is easy to obtain, however if dentin tubules are too dry causing collapsation of the tubules, then a good bond won’t be obtained. In short, there is a complex interplay that the bonding material has to play between two different tissues, to achieve the most effective outcome overall.

Where is the area most commonly associated with the failure of composite resin restorations?

Lower molars? Not sure...

When using Peak Universal Bond, according to the manufacturer, you etch the tooth with phosphoric acid for what length of time

20 seconds!

The use of the rubber dam is best indicated for ______. ``` Adhesive procedures Quadrant dentistry Teeth with challenging preparations Difficult patients All of the above ```

All of the above

A rubber dam is inverted to Prevent the dam from tearing Prevent the underlying gingiva from accidental trauma Provide a complete seal around the teeth All of the above

Provide a complete seal around the teeth

Factors that affect the success of dentin bonding include all of the following except one. Which one is the exception? Dentin factors such as sclerosis, tubule morphology, and smear layer Tooth factors such as attrition, abrasion, and abfraction Material factors such as compressive and tensile strengths C-factor considerations

Material factors such as compressive and tensile strengths

Major differences between total-etch and self-etching primer dentin bonding systems include all of the following except one. Which one is the exception? The time necessary to apply the material The amount of smear layer removed The bond strengths to enamel The need for wet bonding

ank

Which of the following statements if not true regarding bonding systems? Although dentin bonding occurs slowly, it results in a stronger bond than to enamel. Enamel bonding occurs quickly, is strong, and is long lasting. One-bottle dentin bonding systems may be simpler but are not always better. Dentin bonding is still variable because of factors such as sclerosis, tubule size and tubule location.

Although dentin bonding occurs slowly, it results in a stronger bond than to enamel.

Which one of the following acids is generally recommended for etching tooth structure? ``` Maleic acid Polyacrylic acid Phosphoric acid Tartaric acid Ethylenediamine tetraacetic acid ```

Phosphoric acid

The principle goals of bonding are ______. ``` Sealing and thermal insulation Strengthening teeth and esthetics Esthetics and reduction of post-operative sensitivity Sealing and retention Retention and reduction of tooth flexure ```

Sealing and retention

Place the following steps for the application of an etch-and-rinse (total-etch) three-step dental adhesive in correct sequence. ``` Apply adhesive ____ Rinse etchant and leave surface wet ____ Complete tooth preparation ____ Apply two to three layers of primer ____ Etch enamel and dentin with phosphoric acid for 10 to 15 seconds ____ Light-cure ____ ```

``` Complete tooth preparation Etch enamel and dentin with phosphoric acid for 10 to 15 seconds Rinse etchant and leave surface wet Apply two to three layers of primer Apply adhesive Light-cure ```

The rubber dam can still be used effectively even if teeth are crowded and overlapped because the hole-punch pattern does not always have to be followed. Both the statement and the reason are correct and related Both the statement and the reason are correct, but not related The statement is correct, but the reason is not The statement is not correct, but the reason is correct Neither the statement nor the reason is correct

Both the statement and the reason are correct and related

Advantages of using the rubber dam include: ``` It helps maintain a dry, clean field Increases access and visibility Improves properties of dental materials Protection of the patient and the operator Operating efficiency All of these ```

All of these

Acid etching enamel prior to placement of a composite restoration is required for all of the following reasons, except: Conserves tooth structure Increases esthetics Provides micromechanichal retention

Increases esthetics

Enamel etching is typically completed with: 35-37% phosphoric acid 13% phosphoric acid 37% hydrochloric acid 7% hydrofluoric acid

35-37% phosphoric acid

An enamel bonding agent that bonds enamel to composite is termed a “cohesive joint”; this is because there are three materials involved. Both the statement and the reason are correct and related Both the statement and the reason are correct, but not related The statement is correct, but the reason is not The statement is not correct, but the reason is correct Neither the statement nor the reason is correct

The statement is not correct, but the reason is correct ??? both statement are false

The smaller the contact angle of the drop of adhesive, the greater the wetting of the substrate, and thus the greater potential for adhesion. True False

True

Dental bonding and dental adhesion are synonymous terms. True False

True

Secondary dentin is formed in response to caries, operative procedures, or wear. The dentin formed in response is formed by secondary odontoblasts. Both statements are true Both statements are false The first statement is true, the second statement is false The first statement is false, the second statement is true

Both statements are false WRONG 1st is false, secondary is true

Class II carious lesions generally start____________ to the proximal contact? Occlusal Facial Lingual Gingival

Gingival

Forming the proximal box of a class II preparation is dependent upon which of the following? ``` The position of the contact Caries location Outline of the occlusal preparation All of these None of these ```

All of these

Ideally, the facial and lingual proximal wall extensions should break contact by ____ mm? 2. 0 1. 0 1. 5 0. 5

0.5

The axial wall contour should be convex? True False

True

The axiopulpal line angle should be sharp to improve resistance form? True False

False, should be round

Proximal retention grooves should be placed at the expense of the facial and lingual walls? True False

True, maybe false ????

In ideal cases, the gingival seat/floor is _____________ and ________________ to the long axis of the tooth? Flat, perpendicular Rounded, perpendicular Flat, parallel Rounded, parallel

Flat, perpendicular

What is the principle reason requiring a 90 degree exit angle for a cavity preparation? Unsupported enamel will cause the restoration to fracture Acute cavosurface angles will lead to tooth fracture 90 degree exit angles allow for optimal retention and resistance form All of these

90 degree exit angles allow for optimal retention and resistance form

filler

64. When a matrix band is placed ideally, it should extend gingivally, at least, ______mm below the gingival seat, and should extend occlusally, at least, ______mm above the cavosurface. 1, 1 0.5, 0,5 2, 1 1, 2

1,1

. The gingival wedge functions to do all of the following, except? a. Aid in developing proximal contour b. Replace the use of a dental dam for isolation and moisture control c. Attain separation of adjacent tooth contact position to compensate for the thickness of the matrix band d. Hold the matrix band tightly against the gingival seat

b. Replace the use of a dental dam for isolation and moisture control

66. The single most important factor in protecting the pulp from insult is: a. Rinsing a prepared tooth with chlorhexadine b. Placing a base or liner on every cavity preparation c. Using composite as a restorative material d. The amount of dentin thickness remaining

d. The amount of dentin thickness remaining

67. A tooth with no history of spontaneous pain, and a periapical lesion radiographically is a good candidate for a pulp cap. a. True B. False

B. False

68. Dull cutting surfaces on dental burs actually show less of an adverse effect in the pulp as compared to sharp cutting surfaces. a. True b. False

False

69. Ideal pulpal protection for a tooth with a deep cavity preparation that will receive a composite resin restoration can include all of the following, except: a. IRM as a base b. A RMGI such as Vitrabond c. A traditional GI such as Fuji d. The appropriate bonding system

a. IRM as abase

70. Direct pulp caps have a better prognosis than indirect pulp caps. a. True b. False

False

71. Of the varnishes, liners and bases we use to protect the pulp, IRM provides the best pulpal protection. a. True b. False

false

72. Please order 1-7, the steps of use for Peak Universal bond _____ Rinse and suction for 5 seconds _____ Air dry at half pressure for 10 seconds _____ Light cure for the recommended time _____ Lightly dry _____ Etch the enamel and dentin for 20 seconds _____ Scrub for 10 seconds _____ Apply Peak

____2_ Rinse and suction for 5 seconds ____6_ Air dry at half pressure for 10 seconds ____7_ Light cure for the recommended time ____3_ Lightly dry ___1__ Etch the enamel and dentin for 20 seconds ____5_ Scrub for 10 seconds ____4_ Apply Peak

73. Advantages of using silver amalgam as a restorative material include all of the following, except: a. Long life of the restoration b. Insulates the tooth c. Excellent wear-resistance d. High compressive strength

b. Insulates the tooth

74. Advantages of using composite resin as a restorative material include all of the following, except: a. Bonds to tooth structure b. Esthetic c. Great for patients with all ranges of oral hygiene d. Can be placed in more conservatively prepared teeth

c. Great for patients with all ranges of oral hygiene

75. Disadvantages of using silver amalgam as a restorative material include: a. Difficulty of use b. Non-esthetic c. Occlusal wear is similar to Glass Ionomer d. All of these

b. Non-esthetic

76. Disadvantages of using composite resin as a restorative material include: a. Technique sensitivity b. Isolation is essential c. Polymerization shrinkage d. All of these

d. All of these

77. It is important, when placing a base or a liner, to bring the level of the pulpal floor and axial walls to the ideal depth and internal form a. True b. False

b. False

78. One should never remove sound tooth structure to provide space for a base. a. True b. False

True

79. What distinguishes a base from a cavity liner? a. Final application thickness b. Degree of pulpal protection c. Biocompatibility of material d. Degree of hardness

a. Final application thickness

80. The diagonal slot on the Tofflemire matrix retainer as placed facing the gingiva. This: a. Allows for easier wedge placement b. Is less harmful on the gingiva c. Permits easy separation of the retainer from the band in an occlusal direction d. Allows for better contour of band to tooth

c. Permits easy separation of the retainer from the band in an occlusal direction

Advantages of using composite resin as a restorative material include all of the following, except: Bonds to tooth structure Esthetic Great for patients with all ranges of oral hygiene Can be placed in more conservatively prepared teeth

Great for patients with all ranges of oral hygiene

Disadvantages of using composite resin as a restorative material include: Technique sensitivity Isolation is essential Polymerization shrinkage All of these

All of these

The following condition MAY preclude the use of the rubber dam, except: ``` Some respiratory issues Teeth that are not erupted sufficiently Some third molars Time constraints Severely tilted teeth ```

Time constraints

When flossing the dental dam through the contact areas, it is critical to floss both edges of the punched hole at the same time. True False

False

Cotton rolls are inadequate for isolation, in most bonding situations. True False

True

It is important to use natural latex for rubber dam material. True False

True

When flossing the dental dam through the contact areas, it is critical to floss both edges of the punched hole at the same time. True False

false

Cotton rolls are inadequate for isolation, in most bonding situations. True False

true

It is important to use natural latex for rubber dam material. True False

false