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PROSTHO > 14. Dls > Flashcards

14. Dls Flashcards

1
Q

means establish for the time being,

A

interim

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2
Q

it must terminate the finish line and not in the grounds which will cause inflammation

A

TEMPORARY RESTORATION

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3
Q

→ check anatomy and health of tissue
→ if inflammation is present, the final crown cannot be installed
right away

A

TEMPORARY RESTORATION

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4
Q

protect pulp for a vital tooth

o if we leave it exposed, patient may feel sensitivity because of dentinal tubules

A

BIOLOGICAL

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5
Q

→ maintain periodontal health
o overhang and excess cervical areas must be removed to
prevent inflammation

A

BIOLOGICAL

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6
Q

→ provide occlusal compatibility
o there should be no contacts or interference when the patient bites on it against opposing tooth

A

BIOLOGICAL

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7
Q

→ maintain tooth position

  • tooth is anchored by periodontal ligament
  • there might be instances where the tooth will move; once it moves, there will be a hard time inserting crowns or bridges
    → protect against fracture
A

BIOLOGICAL

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8
Q

resist functional loads

A

MECHANICAL

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9
Q

→ resist removal forces
o design of reduction

A

MECHANICAL

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10
Q

→ maintain inter-abutment alignment
*contact areas must be maintained, spaces that are lost must be regained by the temporary restorations and maintain alignment

A

MECHANICAL

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11
Q

→ easily contourable
→ color compatibility
→ translucency
→ color stability

A

ESTHETIC

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12
Q

These things will overlap and there is an optimum interim restoration when all are satisfied

A

ESTHETIC

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13
Q

mold cavity is created by two correlated parts:

A

*External Surface Form (ESF)
* Tissue Surface Form (TSF)

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14
Q

→ external contour of the crown
→ what you see (anatomy, size, and shape of the temporary
restoration)

A

EXTERNAL SURFACE FORM

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15
Q

EXTERNAL SURFACE FORM has (2) categories:

A

o Custom
o Preformed

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16
Q

is a negative reproduction of either the patient’s teeth before preparation or a modified diagnostic cast

A

CUSTOM

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17
Q

maybe directly obtained with any impression material (irreversible hydrocolloid and silicone are convenient)

A

CUSTOM

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18
Q

easy accurate reseating done by trimming the thin areas of
impression material (interproximal or gingival margin)

A

CUSTOM

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19
Q

True or false

various preformed crowns are available commercially

A

True

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20
Q

→ choose one which will fit the tooth that is to be prepared
→ after restoring the teeth, you can use the vacuum type of template (transparent)

o place cast on a vacuum machine → template

o after reduction of abutments → temporary crowns using template

A

PREFORMED

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21
Q

→ baseplate wax can be used as it is more convenient and economical but more complicated
→ some people make escape holes so that when injected there are no bubbles

A

PREFORMED

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22
Q

→ most crown forms need modifications: internal relief, axial re-contouring, occlusal adjustment in addition to lining procedure
→ generally limited to use as a single restoration because it is not
feasible to use them as pontics for FDPs

A

PREFORMED

23
Q

→ has the most natural appearance

A

POLYCARBOXYLATE

24
Q

available in single shade (monolithic)

A

POLYCARBOXYLATE

25
Q

cervical to incisal has a different hue and chroma but this only
has one shade

A

POLYCARBOXYLATE

26
Q

→ available for incisors, canine and premolar teeth (not for molars)

→ limited use

A

POLYCARBOXYLATE

27
Q

True or false

polycarbonate crown forms are more tolerable, selected to
establish contact areas

A

True

28
Q

→ crown form consists of thin, soft, and transparent material
→ becomes a shell

A

CELLULOSE ACETATE

29
Q

→ size and shape can be selected from a mold guide
→ crown form is trimmed and festooned to fit the preparation without impingement on the soft tissue
→ available in all tooth types

A

CELLULOSE ACETATE

30
Q

True or false

shape will not conform the cellulose acetate

A

False

(shape WILL conform the cellulose acetate)

31
Q

suitable for posterior teeth since it is colored

A

ALUMINUM

32
Q

→ have anatomical shaped occlusal and axial surface (ridges can
be seen)
→ care must be taken during try in verification of their delicate
margins

A

ALUMINUM

33
Q

→ adapt the margins to the finish line
→ as it is highly ductile, it allows easy contouring to conform to the
shape of the finish line

A

ALUMINUM

34
Q

available for posterior teeth

A

TIN-SILVER

35
Q

→ alloy (mixture of tin and silver) is very soft and the margin of
the crown can be flexed prior to the seating with a swaging
block
→ can be contoured since it is flexible

A

TIN-SILVER

36
Q

Produce a close marginal fit after the shell is trimmed with a bur

A

TIN-SILVER

37
Q

→ fit will depend on how you form and contour so that it can sit on the finish line
→ rest of the surfaces should also be lined with acrylic resin (self-cure) to provide good internal adaptation and retention of the temporary restoration
→ modify the cervical (contour or cut) to fit the prepared abutment

A

TIN-SILVER

38
Q

→ used in children with extensively damaged primary teeth
→ cannot be altered with resin

A

NICKEL-CHROMIUM

39
Q

→ crowns can be easily re-contoured using pliers
→ indicated for long-term interim restorations

A

NICKEL-CHROMIUM

40
Q

→ prepared tooth surface and edentulous ridge (when present) → more concerned with what’s in contact with the tissues
→ shape of crown in cervical, labial, and lingual areas

A

TISSUE SURFACE FORM

41
Q

TISSUE SURFACE FORM has (3) categories:
o Indirect
o Direct
o Indirect-direct

A

o Indirect
o Direct
o Indirect-direct

42
Q

made by the lab

A

“custom”

43
Q

not in the patient’s mouth

A

“indirect”

44
Q

technique involves fabrication of the interim restoration outside the mouth

A

CUSTOM INDIRECT PROVISIONAL RESTORATION

45
Q

ADVANTAGES
→ no contact of free monomer with the prepared teeth or gingiva which might cause tissue damage and an allergic reaction or sensitization

A

CUSTOM INDIRECT PROVISIONAL RESTORATION

46
Q

ADVANTAGES

→ the technique avoids subjecting prepared tooth to the heat evolved from the polymerizing resin

A

CUSTOM INDIRECT PROVISIONAL RESTORATION

47
Q

ADVANTAGES

indirect technique produces restoration with a superior marginal fit and as an auxiliary is involved in fabricating the restoration in the lab, it frees the patient and dentist for considerable amount of time

A

CUSTOM INDIRECT PROVISIONAL RESTORATION

48
Q

the technique produces a custom made preformed external surface form of the restoration but the internal tissue surface form is formed by the underprepared diagnostic casts–lesser than the ideal

A

CUSTOM INDIRECT-DIRECT INTERIM RESTORATION

49
Q

ADVANTAGES
→ with the combination indirect-direct technique, chair time can be reduced since the provisional shell is fabricated before the patient’s appointment

A

CUSTOM INDIRECT-DIRECT INTERIM RESTORATION

50
Q

ADVANTAGES

→ enhanced control over restoration contours minimizes the time required for chair side adjustments

A

CUSTOM INDIRECT-DIRECT INTERIM RESTORATION

51
Q

ADVANTAGES

smaller amount of acrylic resin will polymerize in contact with the prepared abutment, resulting in decreased heat generation, chemical exposure, and polymerization shrinkage compared to the direct technique

A

CUSTOM INDIRECT-DIRECT INTERIM RESTORATION

52
Q

DISADVANTAGES
→ the disadvantage of this procedure is the potential need of a laboratory phase before tooth preparation and the adjustments that are frequently needed to seat the shell completely on the prepared tooth

A

CUSTOM INDIRECT-DIRECT INTERIM RESTORATION

53
Q

DISADVANTAGES

potential tissue trauma from the polymerizing resin and inherently poorer marginal fit

o these resins produce heat when setting

A

CUSTOM INDIRECT-DIRECT INTERIM RESTORATION

54
Q

DISADVANTAGES

→ therefore, the routine use of directly formed interim restoration is not recommended when indirect techniques are feasible

A

CUSTOM INDIRECT-DIRECT INTERIM RESTORATION

PROSTHO (17 decks)

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