S4 Flashcards by rob luna

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

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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

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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

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Adding carbon to chromium-cobalt alloy has effect on it’s
a. Strength
b. Flexibility
c. Corrosion resistance
d. CTE

a. Strength

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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

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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

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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

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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

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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

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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

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901 bur is known as

a. Inverted cone
b. Wheel bur
c. End-cutting
d. Flame shape

c. End-cutting

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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

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This is to eliminate Christensen’s Phenomenon
a. Lingualized Occlusion
b. Lateral Excursion record
c. Compensative Curves
d. Curve of Wilson

c. Compensative Curves

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Minimally acceptable crown:root ratio
a. 1:1
b. 1:2
c. 1:3
d. 2:3

a. 1:1

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It is the movement of the condyle during maximum mouth opening
a. Lateral
b. Vertical
c. Rotation
d. Translation

d. Translation

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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

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Polymer to monomer ratio by volume
a. 1:1
b. 2:1
c. 3:1
d. 4:1

c. 3:1

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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

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Least important when choosing a shade for the artificial teeth

a. Hue
b. Value
c. Chroma

a. Hue

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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

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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

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Gas that is used during depigmentation of dark gingiva
a. Nitrogen
b. Propane
c. Oxygen
d. Hydrogen

a. Nitrogen

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Seesaw is what type of lever?
a. 1
b. 2
c. 3
d. 4

a. 1

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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

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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

Flexible dentures are made of? a. Acrylic b. Nylon c. Plastic d. High impact resin

b. Nylon

Direction of ridge resorption in mandibular bone a. Anterior and inferior b. Superior and posterior c. Superior and lateral d. Inferior and medial

a. Anterior and inferior

After taking impression using polyvinyl siloxane (addition silicones), which of the following gas may evaporate because of an imbalance chemical reaction? a. Hydrogen b. Nitrogen c. Oxygen d. Helium

a. Hydrogen

A whistling sound may be observed when a patient is trying to produce the “S” sound if a. If the maxillary anterior teeth are set more anteriorly increasing the overjet b. Maxillary anterior teeth are set more palatally decreasing the overjet c. There is proper contour of the palate palatal to the incisors d. None of the above

a. If the maxillary anterior teeth are set more anteriorly increasing the overjet

Which impression material has the greatest tear strength? a. Polyvinyl Siloxane b. Hydrocolloids c. Polyether d. Polysulfide

d. Polysulfide

A type of a partial veneer crown that restores the incisal or the occlusal surface and three or four axial surfaces excluding the lingual surface a. Three-quarter crown b. Reverse three-quarter crown c. One-half crown d. Seven-eighths crown

b. Reverse three-quarter crown

What procedure is done to resurface the tissue side of a denture with new base material for better adaptation to the underlying denture bearing area? a. Reline b. Rebase c. Processing d. Investing

a. Reline

Procedure during the fabrication of a cast restoration that results to elimination of the wax pattern. a. Casting b. Burn-out c. Investing d. Sprueing

b. Burn-out

Which of the following does not correctly describe the proximal plate? a. It must contact proximal guiding planes on the teeth b. It determines the path of insertion of an RPD framework c. It must be extended vertically about 2/3 of the length of the crown from the cervical to the marginal ridge. d. All of the above e. none of the above

c. It must be extended vertically about 2/3 of the length of the crown from the cervical to the marginal ridge.

In order to compensate for the contraction of gold alloy, dental investments make use of a. Hygroscopic expansion b. Setting expansion c. Thermal expansion d. All of the above

d. All of the above

Addition of this makes the most effective way in strengthening gold alloys a. Platinum b. Copper c. Zinc d. Silver

b. Copper

It is the ideal crown to root ratio a. 2:3 b. 1:1 c. 1:2

c. 1:2

A whistling sound when wearing dentures is due to a. Too narrow posterior dental arch b. Too wide posterior dental arch c. Insufficient lip support d. Excessive thickness of the palatal denture base

b. Too wide posterior dental arch

It does not affect the resiliency of the clasp arm a. Casting procedure b. Length c. Diameter d. Cross-sectional form

a. Casting procedure

TCS means a. Thermoplastic Comfort Systems b. Thermoplastic Ceramic Systems c. Thermoplastic Conditioning Systems

a. Thermoplastic Comfort Systems

The characteristic of a tooth crown which is not a good candidate for a partial veneer crown a. Long b. Thick c. Square d. Short

d. Short

Which of the following best describes the RULE of BULL a. It is the selective grinding of interferences in the working-side movements of the buccal cusp inner inclines of upper teeth and lingual cusp inner inclines of the lower teeth b. It is the selective grinding of interferences in the non-working-side movements of the buccal cusp inner inclines of upper teeth and lingual cusp inner inclines of the lower teeth c. It is the selective grinding of interferences in the working-side movements of the lingual cusp inner inclines of upper teeth and buccal cusp inner inclines of the lower teeth d. It is the selective grinding of interferences in the non-working-side movements of the lingual cusp inner inclines of upper teeth and buccal cusp inner inclines of the lower teeth

a. It is the selective grinding of interferences in the working-side movements of the buccal cusp inner inclines of upper teeth and lingual cusp inner inclines of the lower teeth

What is an example of a Non-silica-based ceramics? a. Lithium disilicate ceramic b. Zirconia c. Leucite-Reinforced ceramic d. Feldspathic porcelain

b. Zirconia

The maxillary incisal plane should be parallel to which of the following when constructing a complete denture a. Camper’s line b. Interpupillary line c. Bizygomatic line d. Lower lip line

b. Interpupillary line

In determining the posterior limit of a maxillary denture base, which of the following is on the most posterior border? a. Hamular notch b. Fovea palatini c. Hamular process d. Vibrating line e. Pterygomandibular raphe

a. Hamular notch

Wheelbarrow is what type of lever a. 1 b. 2 c. 3 d. 4

b. 2

Unreinforced ZOE or the ordinary type is used for a. Cementation of temporary crown b. Cementation of inlays and onlays c. Cementation of permanent crown d. Cementation of laminates

a. Cementation of temporary crown

Feldspathic porcelain is composed primarily by the oxides of the following, except: a. Silicon b. Aluminum c. Feldspar d. Zirconia

d. Zirconia

Best finish line for cast gold restorations a. Shoulder b. Shoulder with bevel c. Chamfer d. Knife edge

c. Chamfer

Excessive monomer added to acrylic resin results in? a. Increased expansion b. Increased heat generation c. Increased Shrinkage d. Increased Strength

c. Increased Shrinkage

Resistance of a denture to movement on its tissue foundation, especially to lateral or horizontal forces. This is a definition of A. Retention B. Stability C. Support D. None of the above

B. Stability

All of the following are noble metals except a. Silver b. Gold c. Platinum d. Palladium

a. Silver

The least desirable type of all major connectors used in maxillary arch when constructing a RPD framework a. Anterior and posterior palatal strap b. Anterior and posterior palatal bar c. Anterior U-shaped d. Palatal plate

c. Anterior U-shaped

Absence of shrinkage of impression material after curing refers to what property of the material? a. Optimal stiffness b. Complete plasticity c. Dimensional accuracy d. Dimensional stability

d. Dimensional stability

The palatal torus must be removed ______ a. If it will not interfere with the denture you are constructing b. If the patient is cancer phobic c. If it is small d. All the time

b. If the patient is cancer phobic

A very thick palatal denture base will primarily affect? a. Phonetics b. Stability c. Esthetics d. Function

a. Phonetics

ADA Specification for Inlay Wax a. 5 b. 4 c. 3 d. 2

b. 4

True or false: the ideal maximum number of pins for a restoration is determined by the number of axial walls a. True b. False

a. True

When evaluating a patient that will receive an RPD framework, which of the following must be taken into consideration? a. Ability of the patient to pay b. Age of the patient c. Weight of the patient d. Condition of the ridge

d. Condition of the ridge

Component of traditional dental porcelain responsible for its translucency a. Feldspar b. Quartz c. Kaolin

a. Feldspar

The amount of gingival to occlusal divergence for an unusually short vertical wall for an inlay/onlay tooth preparation is ideally a. Maximum of 5 degrees b. Minimum of 5 degrees c. Maximum of 2 degrees d. Minimum of 2 degrees

c. Maximum of 2 degrees

Which of the following cements bond chemically to dentin? a. ZOE b. Calcium hydroxide c. Resin d. Glass Ionomer

d. Glass Ionomer

A patient went to your clinic for a complete denture. During the try-in of the denture, the patient is lisping. It is most probably due to a. Thick contour of palatal denture base b. Thin contour of palatal denture base c. Very small speaking space d. Very large speaking space

d. Very large speaking space

After a patient moves his mandible in a right lateral excursion movement, the non-working condyle will move a. Downward, forward and medial b. Downward, forward and lateral c. Upward, backward and medial d. Upward, backward and lateral

c. Upward, backward and medial

The most common reason why a tooth may fracture during post placement a. Oversized post b. Short post c. Tapered post d. Thin post

a. Oversized post

All of the following are advantages of direct gold restorations over amalgam restorations, except: a. Longevity b. Biocompatibility to tissues c. Thermal insulation d. M-D retention of dimensions

d. M-D retention of dimensions

Procedure done to adapt malleable metal restoration to the tooth in order to close any gaps between the restoration and tooth margins a. Finishing b. Polishing c. Boxing d. Burnishing

d. Burnishing

It is defined as the bilateral, simultaneous contact of anterior and posterior teeth during centric and eccentric positions. a. Balanced occlusion b. Canine guided occlusion c. Anterior guided occlusion d. Condylar guided occlusion

a. Balanced occlusion

The mesiodistal length of the cingulum rest is a. 1.0mm b. 2.0mm c. 2.5mm d. 5.0mm

c. 2.5mm

The distance between the major connector on a maxillary removable partial denture framework and the gingival margins should be at least ____. a. 3 mm b. 2 mm c. 6 mm d. 15 mm

c. 6 mm

For a tilted abutment that will be prepared for fixed bridges and has a tendency to have pulpal exposure during preparation. The best pre-operative treatment is to a. Do orthodontic treatment b. Do intentional RCT c. Prepare the tooth. If there is pulpal exposure do pulp capping procedure d. Any of the above

a. Do orthodontic treatment

A decrease in VDO will result to? a. Papillary hyperplasia b. Canker sore c. Epulis fissuratum d. Angular Cheilitis

d. Angular Cheilitis

Best light source when selecting a shade for an artificial tooth. a. Natural light b. Halogen light c. LED light d. Flashlight

a. Natural light

It is the gap between the opposing posterior teeth or occlusal rims when the mandible is protruded. a. Curve of spee b. First-pass effect phenomenon c. Freeway space d. Christensen’s phenomenon

d. Christensen’s phenomenon

A pontic design which is ideally used in anterior segment of the arch a. Saddle ridge lap b. Modified ridge lap c. Hygienic d. Conical

b. Modified ridge lap

Alginate can be sprayed with disinfectant (glutaraldehyde) and placed in a sealed pouch for how many minutes? a. 15 b. 10 c. 20 d. 30

b. 10

Amount of reduction for non-functional cusp for a tooth that will receive a gold restoration a. 1.0 mm b. 1.5 mm c. 2.0 mm d. 2.5 mm

a. 1.0 mm

When designing the occlusal rest of a premolar, which of the following can be used as a guide for its dimension? a. 1/3 of the buccolingual and mesiodistal dimension of the tooth b. ½ of the buccolingual and mesiodistal dimension of the tooth c. The base of the triangle must be 2/3 buccolingually and the mesiodistal dimension should be the same as the base of the triangle. d. Base of the triangle must be 1.5mm while the height is 2.5mm

a. 1/3 of the buccolingual and mesiodistal dimension of the tooth

Which of the following will happen if a clinician violates the biologic width? a. Bone resorption b. Gingivitis c. Caries d. Pulp exposure

b. Gingivitis

An overmixed gypsum will lead to which of the following? a. Increase strength of the cast b. Weaker cast c. Does not affect the strength of the cast

b. Weaker cast

Record used to be able to identify condylar inclination which can be used in adjusting condylar guidance in a semi-adjustable articulator a. Protrusive record b. Right lateral excursive record c. Centric relation record d. Centric occlusal record

a. Protrusive record

A type of articulator wherein the condylar elements are on the lower member of the articulator, while the mechanical fossae are placed on the upper member. a. Class I articulator b. Class III arcon articulator c. Class III non-arcon articulator d. Class II articulator

b. Class III arcon articulator

Composites containing large filler particles will produce which characteristic? a. Rough b. Smooth c. Easily polished d. Increase wear resistance

a. Rough

The _____ is used as a guide to verify the occlusal plane. a. Ala-tragus line b. Interpupillary line c. Camper’s line or plane d. All of the above

d. All of the above

The anatomic structure that dictates the most distal extension of a maxillary denture a. Posterior palatal seal b. Vibrating line c. Incisive papilla

b. Vibrating line

S4 Flashcards

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