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Direct Restoration > Lecture 7 > Flashcards

Lecture 7 Flashcards

1
Q

Define erosion:

A

loss of cervical dental hard tissues by CHEMICAL action of acids, not bacterial

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2
Q

Define attrition:

A

loss of cervical tooth substance by tooth-to-tooth contact

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3
Q

Define abrasion:

A

loss of cervical tooth substance from factors other than tooth contact (tooth paste, toothbrush), mechanical frictional forces

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4
Q

Define abfraction:

A

loss of tooth substance from occlusal stress in the cervical region

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5
Q

3 main categories of non-carious cervical lesions:

A

erosion, abfraction, and abrasion

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6
Q

T or F? Pts are at increased risk for non-carious cervical lesions with increased age.

A

T

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7
Q

What often plays a large role in non-carious cervical lesions?

A

xerostemia

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8
Q

Clinical manifestation of abrasions:

A

V-shaped notch (brush), sharp angles, may exhibit sensitivity to hot and cold

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9
Q

Causes of abrasion:

A

tooth brushing, paste, tongue, dental floss, toothpicks, removable appliances, food

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10
Q

T or F? Toothpastes are abrasive in nature.

A

T

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11
Q

Causes of abfration:

A

teeth flex under occlusal load, transmitted ot cervical region causing rods to break where the tooth is thinnest. V shaped notches, associated with the loss of Class V restorations and wear facets (forces applied to cervical region due to occlusal forces)

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12
Q

What type of forces are responsible for abfraction?

A

flexural

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13
Q

What can help to determine the etiology of a NCCL?

A

the morphological presentation, wedge vs. saucer shaped

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14
Q

T or F? Etiology can be determined based on lesion shape of NCCLs.

A

F.

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15
Q

What makes it difficult to determine the etiology of an NCCL?

A

they are multifactorial, not just one etiology

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16
Q

How does abfraction begin?

A

occlusal forces causing tooth flexure in the cervical region

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17
Q

What should you check if you suspect that the NCCLs are associated with wear facets?

A

check occlusion for interference

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18
Q

At what part of the lesion do occlusal forces concentrate?

A

the deepest part

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19
Q

T or F? The deeper the lesion, the worse the stress, the faster the lesion will progress.

A

T

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20
Q

When not to tx NCCLs:

A

minimal lesion with no sensitivity, eliminate the etiological factor only

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21
Q

When to tx NCCL operatively:

A

sensitivity to thermal changes, and/or mechanical stimulation, esthetic concerns, nuisance-food collects, threat to the strength/integrity of the tooth due to depth

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22
Q

T or F? The deeper a lesion, the faster it will progress.

A

T

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23
Q

When to use a glass ionomer or RBGI to tx NCCL:

A

food trap, or sensitivity or threat to tooth structure

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24
Q

Tx for NCCL besides surgical:

A

preventive interceptive, de-sensitizing agents (fluoride, varnishes), bonded restorations (composites, RGMI’s), occlusal adjustments, occlusal guards (7:42)

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25
Q

T or F placement of a bonded resto will halt progression of a NCCL.

A

F. slow only, changes the distribution of the stress.

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26
Q

How is the stress altered with the placement of RBGI to tx a NCCL?

A

distribution of the stress, acts as a cushion

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27
Q

Class V indications:

A

caries, non-carious cervical lesions, replacement of existing restorations

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28
Q

External Outline:

A

Occluso-gingival width: 2mm wide measured at the center, Gingival margin: 1mm from gingiva, Mesio-distal width: centered messy-distally and extended to the MF and DF line angle

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29
Q

Appearance of non-carious cervical lesion

A

shinier, sharper in appearance

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30
Q

What type of restoration is todays Class V restoration?

A

Box-shaped type preparation

31
Q

Goal of shaping the booth prep

A

90’ to the cavosurface margin

32
Q

At what angle should all wall propose meet the external unprepared tooth structure?

A

90’

33
Q

Why do we want a 90’ angle at the cavosurface margin?

A

bc of the way the enamel rods are oriented, we don’t ant unsupported enamel

34
Q

What does it mean if you can see the cavosurface wall in its entirety?

A

it diverges toward the tooth surface

35
Q

Where does the bevel begin?

A

the dej

36
Q

why do we start the bevel at the dej?

A

to bond better (increase s.a. for bonding)

37
Q

What should the length of the bevel be in any setting?

A

it varies

38
Q

What is the etch that we use?

A

35% phosphoric acid

39
Q

What bur should be used for contouring lingual surfaces of anterior teeth?

A

football

40
Q

T or F? The tooth should be dry for bulk contouring and wet for fine contouring when finishing.

A

F. wet for bulk, dry for fine

41
Q

Why does the Resin-enamel interface need to be undetectable?

A

surface staining, plaque accumulation, wear characteristics

42
Q

Problem encountered when dry finishing:

A

disk gets clogged with abrasive particles, less efficient

43
Q

What color disk should we start w in this project?

A

orange

44
Q

Which disks are for polishing?

A

the 2 yellow

45
Q

Do the polishing disks work better when stiffer or more flexible?

A

flexible

46
Q

What are the finishing and polishing cups impregnated with?

A

abrasive materials

47
Q

Advantage of rubber points and cups over disks:

A

access o grooves, O anatomy, and concave lingual surfaces of the ant teeth

48
Q

Should the blue diacomp polisher be used with or without water?

A

with (medium)

49
Q

Should the grey diacomp polisher be used with or without water?

A

slow w o (fine)

50
Q

How many shapes and grit sizes of astropol (ivoclar vivadent) polishers are there?

A

4: small and large flames, cup, disk, 3 grit sizes

51
Q

T or F? The astropol polishing cups should never be used with water.

A

F. Use w and rinse bw grits

52
Q

Do we need polishing paste with the astropol polishing system?

A

no

53
Q

What are engrained within the fibers of the astrobrush polishers?

A

silicon carbide (high gloss polishing)

54
Q

What are the astropol cusp made of?

A

silicon rubber and aluminum oxide

55
Q

T or F? The astropol cusp wear quickly and need to be replaced as soon as the outer layer of silicon carbide is worn down.

A

F. as bristles are worn, fresh abrasive medium is exposed on the surface

56
Q

What are finishing strips made of?

A

metal or plastic

57
Q

What are metal finishing strips used for?

A

gross reductions, usually amalgam

58
Q

What are plastic finishing strips used for?

A

RBC restos

59
Q

T or F? Rinse bw grits of the inter proximal strips.

A

T

60
Q

At what angle should you used the #12 scalpel blade?

A

45’

61
Q

12 scalpel blade is good for:

A

interproximal gingival excess remoal

62
Q

What does the selection of the appropriate finishing and polishing system depend on?

A

contouring vs. polishing/ flat vs. curved surface

63
Q

Contouring tools:

A

7901 burr, 7904 burr, ine grit diamond burr in slow speed, astropol (gray and green), and SofLex (red and orange)

64
Q

Polishing tools:

A

astropol (pink), Spflex, (dark and light yellow) and astrobrush

65
Q

What is the SofLex Kit (including madrel) good for?

A

Flat surfaces (finishing, contouring, and polishing)

66
Q

What is the Astropol (points and cups) good for?

A

both flat and round surfaces (i.e. lingual of ant teeth, occlusal surfaces) (finishing, contouring, and polishing)

67
Q

What is the Astrobrush good for?

A

Both flat and round surfaces (high gloss polish)

68
Q

You might need #12 scalpel when filling these classes of resto:

A

Class II and Class III

69
Q

What may result if we leave remaining composite past the bevel before we polymerize?

A

to remove we may take healthy tooth structure as well

70
Q

Which color disc should we begin with for the finish?

A

orange

71
Q

How to use the disc properly for finishing?

A

proper angle necessary

72
Q

finishing includes:

A

contouring, shaping, modifying, polishing

73
Q

Appearance of the tooth structure after using a disc:

A

dull

74
Q

Why do we airdrop after the application of the bonding agent?

A

bc adhesives always work best in thin layers

Direct Restoration (23 decks)

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