Midterm 1 Flashcards
In an amalgam preparation, what is the proper depth of the pulpal floor before caries is removed?
0.5 mm into the DEJ
1.5 mm total
Which of the following is FALSE concerning condensation of dental amalgam?
The operator applies 6-10 pounds of thrust.
The operator has about 5-7 minutes to complete condensation.
The technique must be orderly, stepwise, and overlapping.
Overpacking is only done to ensure the removal of the mercury-rich surface during carving.
the operator has about 5-7 minutes to complete condensation
Which of the following is an example of resistance form for an amalgam cavity preparation?
a. Grooves.
b. 90-degree cavosurface angle
c. Pins.
d. Occlusal dovetails
b. 90-degree cavosurface angle
How many degrees do walls converge or diverge in cavity preparations?
a. 2-3
b. 3-4
c. 9-10
d. 5-7
d. 5-7
When carving a Class I silver amalgam restoration, what is the first step that is done following the pre-carve burnish?
a. Form grooves
b. Place cuspal inclines
c. Locate margins
d. The tooth is rinsed with water
c. locate margins
Which of the following is NOT an example of resistance form for an amalgam cavity preparation
a. Flat pulpal floor.
b. Restricting the extension of external walls
c. Converging walls under cusps
d. Proper amalgam bulk
c. converging walls under cusps
this is retention form
Which of the following is an abbreviation for a Class I preparation?
a. MO
b. MI
c. DL
d. OL
d. OL
other Class I: O, OM, OD, OL, OB
T/F: An external line angle is a line angle is formed by 2 external walls meeting.
True
T/F: The cavosurface margin is the angle of tooth structure formed by the junction of a prepared wall and the external surface of the tooth
true
T/F: When using amalgam carving strokes the carving instrument should always move from enamel to amalgam
true
T/F: A Class I lesion should not be prepared to receive a restoration until it is visible on a radiograph
False
T/F: Natural ridges, free of defective grooves can usually be preserved and should not be included within cavity preparations unless less than 1mm of sound supported tooth structure remains.
true
T/F: With the exception of the mandibular first premolar, the pulpal floor is normally cut perpendicular to the long axis of the tooth placing it perpendicular to the forces of occlusion.
true
T/F: Since the operator has only 5-7 minutes to complete condensation, she/he should always use the large end the amalgam carrier to deliver the most amalgam possible to the preparation and decrease the amount of time spent condensing.
False
T/F: The cavosurface margin is the angle of tooth structure formed by the junction of a prepared wall and the external surface of the tooth
True
Write Black’s Six Steps in the order in which he proposed them. Be able to define each category within the steps.
- outline form
- resistance/retention form
- convenience form
- removal of remaining decay
- finish enamel walls
- cleanse preparation
The only exception to the rule of creating the pulpal floor perpendicular to the long axis of the tooth is what tooth?
a. The maxillary first molar
b. The mandibular first molar
c. The mandibular first premolar
d. The mandibular second molar
c. the mandibular first premolar
T/F: Both convergence and divergence occur in the walls of a properly prepared Class I amalgam preparation.
True
T/F: The cavosurface margin is the angle of tooth structure formed by the junction of a prepared wall and the pulpal floor.
False
After completion of Black’s first step, the proper depth of the pulpal floor for an amalgam preparation is:
0.5 into DEJ (dentin)
1.5mm total
T/F: When preparing a tooth for a silver amalgam restoration, unsupported enamel does not need to be removed.
False
all unsupported enamel needs to be removed or else there will be fracture
Condensation of dental amalgam is only done in a vertical direction because the amalgam is fluid enough to adapt to the preparation walls without any lateral condensation.
Both parts of the statement are true.
The first part is true, the second is false.
The first part is false, the second is true.
Both parts of the statement are false.
both parts are false
-condensation should be from all angles
-amalgam is not fluid enough
T/F: Mesial and distal cavosurface margins should be parallel with the appropriate marginal, transverse or oblique ridges.
true
What is the PRIMARY source of amalgam retention in a cavity preparation?
a. Vertical preparation walls (retention)
b. Grooves or pins (retention)
c. Mechanical undercuts
d. Amalgam bonding agent (retentoin)
c. mechanical undercuts
T/F: Pre-carve burnishing produces denser amalgam at the restoration margins.
true
What are the principle reasons requiring 90-degree cavosurface exit angles for cavity preparation?
a. Unsupported enamel will cause the restoration to fracture.
b. Acute cavosurface angles will lead to tooth fracture.
c. 90 degree exit angle allow for optimal retention and resistance form.
d. All of these.
d. all of these
The 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. insultaes the tooth
amalgam does not, but composite sort of can
Disadvantages of using silver amalgam as a restorative material include:
a. Difficult to use
b. Non-esthetic
c. Occlusal wear is similar to glass ionomer
d. All of the above
b. non-esthetic
X Difficult to use – very easy to use
Non-esthetic – pts don’t like metallic
X Occlusal wear is similar to glass ionomer – amalgam is stronger
The outline form of a cavity preparation incorporates aspects of all of the following, except:
a. Depth of the caries removal.
b. Final margin of the preparation
c. Peripheral extent of the lesion.
d. Should be smooth and flowing, following the anatomy and contour of the tooth
a. depth of the caries removal
that is step 4
Rounding internal cavity preparation angles is part of what form in cavity preparation?
a. Resistance form
b. Retention form
c. Convenience form
d. Outline form
a. resistance form
When carving a Class I silver amalgam restoration, what is the first step that is done following the pre-carve burnish?
a. Form grooves.
b. Place cuspal inclines.
c. Locate margins.
d. The tooth is rinsed with water
c. locate margins
Which of the following is NOT an example of resistance form for an amalgam cavity preparation?
a. Flat pulpal floor.
b. Restricting the extension of external walls
c. Converging walls under cusps
d. Proper amalgam bulk
c. converging walls under cusps
that is the retention form
Which of the following is not a requirement for amalgam preparations?
a. The cavosurface angle must approach 90 degrees
b. The bulk of amalgam must have a minimum thickness of 2mm
c. There must be adequate mechanic retention
b. The bulk of amalgam must have a minimum thickness of 2mm
required:
a. The cavosurface angle must approach 90 degrees
c. There must be adequate mechanic retention
Match to Step: Rounding internal cavity preparation angles is part of what form in cavity preparation
resistance form
Class I
Occlusal pits/fissures of posterior teeth
Lingual pits/fissures of anterior teeth
Class II
Proximal surfaces of posterior teeth
Class III
Interproximal surfaces of anterior teeth (no incisal edge involvement)
Class IV
Interproximal surfaces of anterior teeth with incisal edge involvement
Class V
gumline/cervical third
Class VI
cusps and incisal edges
what teeth have Class I O?
molars
premolars
what teeth have Class I L?
maxillary molars
incisors
what teeth have Class I B?
mandibular molars
what teeth have Class I OM?
maxillary molars
mandibular first premolars
what teeth have Class I OD?
maxillary molars
mandibular first premolars
what teeth have Class I OL?
maxillary molars
what teeth have Class I OB?
mandibular molars
outline form
Shape or outline of the cavity preparation as it meets the external surface of the tooth (cavosurface).
resistance form
The shape and placement of preparation walls that best enables both the restoration and the tooth to withstand, without fracture, mastication forces delivered principally along the long axis of the tooth.
retention form
The shape or form of the conventional preparation that resists displacement or removal of the restoration from tipping or lifting forces.
convenience form
Shape or form of the preparation that provides for adequate observation, accessibility, and ease of operation in preparing and restoring the tooth
Removal of decay form
Elimination of any infected carious tooth structure or left in the tooth after initial tooth preparation.
finish enamel walls form
Further development, when indicated, of a specific cavosurface design and degree of smoothness or roughness that produces the maximum effectiveness of the restorative material being used.
cleanse prep form
removal of debris, drying prep, inspecting prep.
