Test Questions Flashcards
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.
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
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
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
Bonding of resins to dentin is best described as involving \_\_\_\_\_\_\_. Mechanical interlocking Ionic bonding Covalent bonding Van der Waals forces
Mechanical interlocking
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.
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
Rounding internal cavity preparation angles is part of what form in cavity preparation?
Resistance form
Retention form
Convenience form
Outline form
Resistance form
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
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
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
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
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.
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
Another name for root surface caries is senile caries.
True
False
True
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
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
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
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
Operator skill is less of a factor for composite resin restorations as compared to amalgam restorations.
True
False
Fasle
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
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
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
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
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
