Final Questions Flashcards by Rustin Hawker

Which type of composite resins are most commonly used today?
a. Macrofill
b. Microhybrids
c. Microfill
d. Hybrids

b. Microhybrids

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Advantages of composite resin restorations include all of the following, except:
a. The C factor
b. Esthetics
c. Insulation
d. Bonds to tooth structure

The C factor

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The generally accepted maximum thickness of a composite increment that allows for proper cure is _____.
a. 1 to 2 mm
b. 2 to 4 mm
c. 4-6 mm
d. There is no maximum thickness restriction.

a. 1 to 2 mm

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All of the following statements are true concerning posterior composite restorations, except:
a. Posterior composite restorations are frequently indicated in the occlusal lesions that allow conservative preparations
b. Posterior composite restorations are contraindicated in a patient with heavy occlusion (bruxism)
c. Posterior composites are contraindicated in a patient with high caries risk
d. Posterior composite restorations may be indicated for the restoration of Class II cavities in the premolar teeth where the appearance is very important, the cavity margins are in the enamel, and the occlusal contacts are on the enamel
e. Posterior composites are contraindicated for cusp replacements unless a dry operating field is maintained

e. Posterior composites are contraindicated for cusp replacements unless a dry operating field is maintained

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Which property of filled resins is primarily to blame for the failure of Class II composite restorations?
a. Low flexural strength
b. Low compressive strength
c. Low tensile strength
d. Low wear resistance

c. Low tensile strength

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Composite filler particles function to do all of the following, except:
a. Reduce the coefficient of thermal expansion
b. Increase the tensile strength and compressive strength
c. Reduce the polymerization shrinkage
d. Increase the hardness
e. Improve wear resistance

e. Improve wear resistance

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Which restorative material has the lowest thermal conductivity and diffusivity?
a. Amalgam
b. Gold
c. Unfilled resin
d. Filled resin

Unfilled

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Match the dental material on the left with the appropriate Coefficient of Thermal Expansion (ppm/c) on the right.
Unfilled resins 81-92
Composite resins 28-35
Amalgam 22-28
Direct gold 22-14.4
Tooth 11.4

under the word

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Demineralized tooth structure cannot remineralize.

a. True
b. False

false

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A good preventive and treatment strategy for dental caries includes _______.
a. Limiting cariogenic substrate
b. Controlling cariogenic flora
c. Elevating host resistance
d. All of the above

all the above

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Which of the following statements regarding caries risk assessment is correct?
a. The presence of restorations is a good indicator of current caries activity.
b. The presence of restorations is a good indicator of past caries activity.
c. The presence of dental plaque is a good indicator of current caries activity.
d. The presence of pit-and-fissure sealants is a good indicator of current caries activity.

The presence of restorations is a good indicator of past caries activity.

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Which of the following is considered a reversible carious lesion?
a. The lesion surface is cavitated.
b. The lesion has advanced to the dentin radiographically.
c. A white spot is detected on drying.
d. The lesion surface is rough or chalky.

A white spot is detected on drying

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Smooth surface caries refers to _______.
a. Facial and lingual surfaces
b. Occlusal pits and grooves
c. Mesial and distal surfaces
d. Both A and C

d. Both A and C

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Which of the following is a primary contraindication for the use of a composite restoration?
a. Occlusal factors
b. Inability to isolate the operating area
c. Nonesthetic areas
d. Extension onto the root surface

Inability to isolate the operating area

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Which of the following materials has the highest linear coefficient of expansion?
a. Amalgam
b. Direct gold
c. Tooth structure
d. Composite resin

d. Composite resin

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Compared with amalgam restorations, composite restorations are _______.

a. Stronger
b. More technique-sensitive
c. More resistant to occlusal forces
d. Not indicated for Class II restorations

b. More technique-sensitive

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The rate of root surface caries is increasing, in part, because of the increase in gingival recession.
a. Both the statement and the reason are correct and related
b. Both the statement and the reason are correct, but not related
c. The statement is correct, but the reason is not
d. The statement is not correct, but the reason is correct
e. Neither the statement nor the reason is correct

c. The statement is correct, but the reason is not

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Match the following composite resin type to the corresponding filler particle size:

	Macrofill \_\_\_\_\_                                 	a. 0.04 to 1.0 μm
	Microfills \_\_\_\_\_\_\_                                          	b. 1 to 3 μm
	Microhybrids \_\_\_\_\_\_                                    	c. 0.04 to 0.1 μm
	Hybrids \_\_\_\_\_\_\_                                            	d. 0.7 to 20 μm
	Packable \_\_\_\_\_\_\_                                          	e. 0.4 to 0.8 μm
	Flowable \_\_\_\_\_\_\_                                          	f. 10 μm
	Nanohybrids \_\_\_\_\_                                      	g. 20 ηm

Macrofill 10μm
Microfills  0.04 to 0.1 μm
Microhybrids 0.4 to 0.8 μm
Hybrids 1 to 3 μm
Packable 0.7 to 20 μm
Flowable 0.04 to 1.0 μm
Nanohybrids  20 ηm

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Match the following composite resin type to the corresponding filler particle volume:

	Macrofill \_\_\_\_\_\_                                            	a. 35-50%
	Microfills \_\_\_\_\_                                 	b. 70-77%
	Microhybrids \_\_\_\_\_                                     	c. 48-65%
	Hybrids \_\_\_\_\_\_                                             	d. 44-54%
	Packable \_\_\_\_\_                                             	e. 56-66%
	Flowable \_\_\_\_\_\_                                            	f. 75-87%
	Nanohybrids \_\_\_\_\_                                      	g. 60-75%

Macrofill  60-75%
Microfills 35-50%
Microhybrids  56-66%
Hybrids 70-77%
Packable 48-65%
Flowable 44-54%
Nanohybrids 75-87%

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Give three examples when the use of a nanohybrid composite resin material is indicated:

Need strength
Need esthetics
Only one appointment

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When would a microfilled composite resin material be indicated?

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What is “plucking”? (Hint: it has nothing to do with defeathering of a rafter of turkeys)

It is exposure of irregularly-shaped filler particles due to wear of the composite material which results in a rough surface of the composite resin. -Slides 8 & 9 in Composite Resin lecture

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Composite resin has a similar modulus of elasticity to which material?
a. Dentin
b. Amalgam
c. Enamel
d. Porcelain

dentin

Flexural strength is the measure of a material to resist the propagation of a crack.
a. True
b. False

false

25. Wear of a composite resin material is attributed to several different mechanisms. Please give two examples.

Abrasion- Food during mastication | Attrition- Contact with opposing tooth Slide 26 in Composite Resins Lecture

26. All of the following are factors affecting the wear rate of composite resin material, except: a. Type of occlusion b. Size of the restoration c. Filler particle size and volume d. Thickness of the bonded resin

d. Thickness of the bonded resin

27. The most common force that will lead to composite resin failure is compression. a. True b. False

false

28. Hardness and wear are synonymous terms. a. True b. False

false

29. Common causes of failure in composite resin restorations include all the following, except: a. Bulk fractures of the resin b. Secondary caries c. Marginal leakage d. Wear of the resin material

a. Bulk fractures of the resin

30. Isolation and moisture control are a major contributing factors to the long- term success of bonded composite resin restorations. a. True b. True c. All of the above

c. All of the above

31. 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.

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

32. Bonding of resins to dentin is best described as involving _______. a. Mechanical interlocking b. Ionic bonding c. Covalent bonding d. Van der Waals forces

a. Mechanical interlocking

33. When restoring a Class II or Class III lesion, it is important to create properly shaped embrasures for all of the following reasons, except: a. Create a spillway for food during mastication b. Make the teeth self-cleansing c. Protect the gingival tissue, while also allowing stimulation of it d. Provide arch stability

d. Provide arch stability

34. 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? (Circle all that apply) a. It is a mechanical exposure of 1 mm b. The tooth had never been symptomatic c. The pulp appears pink d. The hemorrhage is severe e. It is a pinpoint carious exposure

na a,b, maybe c

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

d. Prevent the patient from talking

36. The principle goals of bonding are ______. a. Sealing and thermal insulation b. Strengthening teeth and esthetics c. Esthetics and reduction of post-operative sensitivity d. Sealing and retention e. Retention and reduction of tooth flexure

d. Sealing and retention

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

e. Neither the statement nor the reason is correct

38. Dental bonding and dental adhesion are synonymous terms. a. True b. False

true

39. The axiopulpal line angle should be sharp to improve resistance form? a. True b. False

false

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

true

41. In ideal cases, the gingival seat/floor is _____________ and ________________ to the long axis of the tooth? a. Flat, perpendicular b. Rounded, perpendicular c. Flat, parallel d. Rounded, parallel

a. Flat, perpendicular

42. What is the principle reason requiring a 90 degree exit angle for a cavity preparation? a. Unsupported enamel will cause the tooth to fracture b. Acute cavosurface angles will lead to restoration fracture c. 90 degree exit angles allow for optimal retention and resistance form -Quiz 1 question d. All of these

d. All of these

43. 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

44. 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

45. 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

false

46. 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 a base

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

false

48. 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

49. 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

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

true

51. Composite resin has a similar Knoop hardness measure to enamel. a. True b. False

false

52. Composite resin material has a significantly higher tensile strength as compared to enamel. a. True b. False

true

53. All composite resin material undergoes polymerization shrinkage. a. True b. False

true

54. When answering a board question about the need for mechanical retention in a preparation for a composite resin material, less does not mean none. a. True b. False

true

55. Why is it important to avoid connecting lateral walls when adding composite resin to your preparation?

To avoid tension on lateral walls and the restoration during shrinkage (C factor)