S4 Flashcards
It refers to the rapid cooling of a metal to alter its molecular structure resulting to increase hardness or resistance to deformation after a heat treatment
a. Annealing
b. Tampering
c. Quenching
d. Casting
c. Quenching
The smear layer is an important consideration in
a. Placement of bevel
b. Establishing the outline form
c. Formation of recurrent caries
d. Dentin bonding
d. Dentin bonding
Among the following, which is the most difficult to distinguish radiographically from dental caries?
a. Methyl methacrylate
b. Glass ionomer cement
c. Composites
a. Methyl methacrylate
Adding carbon to chromium-cobalt alloy has effect on it’s
a. Strength
b. Flexibility
c. Corrosion resistance
d. CTE
a. Strength
When setting teeth in a complete denture, which cusp of the maxillary first molar must contact the occusal plane?
a. MB
b. DB
c. ML
d. DL
c. ML
Type of expansion seen in a 30-minute, 35-degree Celsius hydrobath of the investment ring before burn-out process
a. Setting expansion
b. Thermal expansion
c. Hygroscopic expansion
d. Air expansion
c. Hygroscopic expansion
Which impression material is elastic, sets by physical reaction and is subject to syneresis and imbibition?
a. Irreversible hydrocolloids
b. Reversible hydrocolloids
c. Polysulfides
d. Polyethers
b. Reversible hydrocolloids
When handling impression materials that are new to you, it is best to
a. Use the techniques you apply from your old material
b. Always moisten the oral cavity before taking impression
c. Ask the technique used by other dentists
d. Follow the instructions of the manufacturer
d. Follow the instructions of the manufacturer
A tooth which has not been in function and is now being used as an abutment may become symptomatic. This most likely results from
a. Overstress
b. Pulpal reaction
c. PDL inflammation
d. Osteoclastic activity
c. PDL inflammation
A type of impression technique used for patients with flabby tissues allowing the clinician to record the movable tissue in its passive position
a. Open mouth
b. Functional
c. Selective pressure
d. Closed Mouth
c. Selective pressure
901 bur is known as
a. Inverted cone
b. Wheel bur
c. End-cutting
d. Flame shape
c. End-cutting
When setting maxillary anterior teeth for complete dentures, the ideal location of the artificial teeth is
a. Resting on the ridge
b. Anterior to the ridge
c. Posterior to the ridge
b. Anterior to the ridge
This is to eliminate Christensen’s Phenomenon
a. Lingualized Occlusion
b. Lateral Excursion record
c. Compensative Curves
d. Curve of Wilson
c. Compensative Curves
Minimally acceptable crown:root ratio
a. 1:1
b. 1:2
c. 1:3
d. 2:3
a. 1:1
It is the movement of the condyle during maximum mouth opening
a. Lateral
b. Vertical
c. Rotation
d. Translation
d. Translation
Which of the following materials will produce the most rigid restoration for frameworks of the same dimension?
a. Wrought gold
b. Cobalt-chromium alloys
c. Palladium alloys
d. partial denture casting gold in the hardened condition
b. Cobalt-chromium alloys
Polymer to monomer ratio by volume
a. 1:1
b. 2:1
c. 3:1
d. 4:1
c. 3:1
It is defined as the fractional change in the dimension of a material due to a force acting on it.
a. Stress
b. Strain
c. Tensile
d. Shear
b. Strain
Least important when choosing a shade for the artificial teeth
a. Hue
b. Value
c. Chroma
a. Hue
Which of the following best explains why the dentist should provide a postpalatal seal in a complete maxillary denture? The seal will compensate for:
a. errors in fabrication
b. polymerization and cooling shrinkage
c. tissue displacement
d. deformation of the impression material
b. polymerization and cooling shrinkage
96 to 98% of enamel is organic material. Enamel is harder than bone because it contains hydroxyapatite crystals, while bone does not.
a. The first statement is true; the second statement is false
b. The first statement is false; the second statement is true
c. Both statements are true
d. Both statements are false
d. Both statements are false
Gas that is used during depigmentation of dark gingiva
a. Nitrogen
b. Propane
c. Oxygen
d. Hydrogen
a. Nitrogen
Seesaw is what type of lever?
a. 1
b. 2
c. 3
d. 4
a. 1
Which of the following will retard the setting time of polyvinyl siloxane?
a. Sulfur in latex
b. Ferric sulfate
c. Aluminum sulfate
d. All of the above
a. Sulfur in latex
A component of dental porcelain that acts as a binder, opaquer, and flux
a. Lithium
b. Feldspar
c. Silica
d. Kaolin
d. Kaolin
Beading in major connectors main function is to
a. Maintain tissue contact of the RPD framework
b. Provide additional support and stability of denture
c. Decrease shrinkage of the metal during casting process
d. Prevent fracture during processing
a. Maintain tissue contact of the RPD framework
In a metal-ceramic restoration, fracture of the restoration usually occurs where?
a. In the porcelain
b. Junction of porcelain and metal
c. In the metal
a. In the porcelain
Ideal relief for lingual bar is
a. 2mm
b. 4mm
c. 6mm
d. 8mm
b. 4mm
When you add potassium sulfate in gypsum what will happen?
a. Increase setting time
b. Decrease setting time
c. remains the same
b. Decrease setting time
Material that gives strength to dental porcelains
a. Feldspar
b. Quartz
c. Kaolin
b. Quartz
It is defined as the growth of crystalline structures within the glass or its surface.
a. Devitrification
b. Transformation
c. Annealing
d. Crystalification
a. Devitrification
The proper outline form of an occlusal rest must be
a. Sharp triangular shape with apex towards the center of the occusal surface.
b. Sharp triangular shape with apex away from the center of the occlusal surface
c. Rounded triangular shape with apex towards the center of the occlusal surface
d. Rounded triangular shape with apex away from the center of the occlusal surface
c. Rounded triangular shape with apex towards the center of the occlusal surface
Property of metal that refers to its rigidity or stiffness
a. Strength
b. Hardness
c. Modulus of elasticity
d. CTE
Subsurface porosity of the casting is due to what type of sprue
a. Long
b. Short
c. Thin
d. Thick
b. Short
The component of the polysulfide impression material which causes brown color, stains and foul odor.
a. Lead dioxide
b. Mercaptan
c. Zinc sulfate
d. Steric acid
a. Lead dioxide
If one is fabricating 2 casted restorations, what would be the difference if one is made up of base metal alloy, while the other is made up of noble metal alloy?
a. Noble alloys do not oxidize on casting
b. Base alloys do not oxide on casting
c. Base alloys are more accurate than noble alloys
d. Restorations made up of gold are less accurate than restorations without gold.
a. Noble alloys do not oxidize on casting
Zirconia can be processed by
a. CAD/CAM
b. Baking
c. Pressing
a. CAD/CAM
Excessive vertical dimension may result to which of the following?
a. Drooping of the corners of the mouth
b. Excessive trauma to the underlying tissues
c. Poor retention
d. Wrinkles around the lips
b. Excessive trauma to the underlying tissues
The very first rubber impression material is the
a. Condensation silicones
b. Polyether
c. Addition silicones
d. Polysulfide
d. Polysulfide
Maximum span of the lever arm of the fixed bridge design
a. 1 tooth
b. 2 teeth
c. 3 teeth
d. 4 teeth
c. 3 teeth