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Fixed Prosth 3rd year > L6- Provisional Restoration > Flashcards

L6- Provisional Restoration Flashcards

1
Q

why a restoration needs a provisional?

A
  1. to protect prepared teeth
  2. keep the patient comfortable
  3. as a blueprint for the final restoration
  4. by successful tx with provisional restoration dentist can get the patient confidence which is an influencing factor for success in the final restoration
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2
Q

ideal 3 basic requirements for provisoinal

A
  1. biological
  2. esthetic
  3. mechanical
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3
Q

biologic requirements for temp

A
  1. pulp protection
  2. periodontal health
  3. positional stability
  4. prevention of fracture
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4
Q

esthetic requirements of provisionals

A
  1. color compatibility
  2. translucency
  3. color stability
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5
Q

mechanical requiremetns of provisional

A
  1. functional
  2. retentive
  3. ease of removal
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6
Q

pulp protection - describe

A

part of biologic requirements

during tooth prep the dental
tubules are exposed, thus a provisonal restoraation should protect the prepared tooth from oral environment, therby preventing sensitivity and irritation to pulp

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7
Q

periodonta health - breakdown

A

part of biologic requirements

  • it should have good marginal fit, proper contour and smooth surface to prevent accumulation of plaque, facilitate easy plaque removal and maintain periodontal health
  • it should not violate the biologic width to avoid gingival inflammation
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8
Q

positional stability

A

part of biologic requirements

  • it should provide comfortable, stable, and functional occlusal relationship by maintaining inter and intra-arch stability therby preventing tooth migration, supra-eruption
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9
Q

prevention of fracture

A

part of bio requireemtns of temp

  • it should protect the prepared tooth surface from fracture which is commonly seen in partial coverage restoration, in which margin of preparation is close to the occlusal surface of tooth and could be damaged during chewing
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10
Q

functional requrement

A

part of mechaninal reqiurement

  • it should possess good compressive and flexural strength
  • the strength of material used for fabricating provisional restoration is alway lower than that of the definitive restorative material

serves as a blueprint for final occlusion

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11
Q

loss of retention

A

part of mechanical
- it should have close adaption to the prepared tooth surface to prevent displacement and recementation, which will increase patient visits

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12
Q

ease of removal

A

part of mechanical requirement

  • provisional restoration may need to be removed and recemented often
  • if they are well fabricated with adequate thickness and cemented with weak cement can be removed without breakage
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13
Q

esthetic requrement

A

it should match the shape, size, color, and texture of the resotred tooth especially in the anterior region

color stability is also important if the provisional are to function for a prolonged period

it also serves as a guide to achieve aesthetics to the final restoration

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14
Q

classification according to method of fabricaton

A

prefabricated - shell

custom made – processed

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15
Q

classification according to material used

A

resin –

custom made

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16
Q

resin materials

A

preformed (polycarb, cellulose acetate)

17
Q

custom made materials

A

acrylics, bis acryl composite

18
Q

polycarbonate crowns

A

they combine micro-glass fibers with polycarbonate plastic material

it is used as a matrix around a prepared tooth

avaialble in shape of incisor, canine, and premolars in varying size

19
Q

cellulose acetate

A

is thin, soft, transparent scaffold material

it is available in all tooth shape and different sizes

an approximatley size of this crown is selected from a mould guide and filled with auto-polymerizating resin of appropriate shade

this is inserted over the lubricated prepared tooth

20
Q

direct methods

A

putty matrix

vacuum shell / suck down

block temp

21
Q

indirect method

A

processed provisional

22
Q

musts for large edentulous spaces?

A

a record base and bite rim must be fabricated on the model you intend to mount for the patient with large edentulous spaces

23
Q

facebow allows for

A

proper position of midline to facial landmarks as well as proper cant of adjacent teeth

24
Q

breakdown of needs when communicating with lab

A
  1. what are you sending
  2. was it mounted? - if so on what?
  3. types of prosthetic restorative support yu need
    - fixed, removable, CAD/CAM
  4. materials available - specific information
    - shade
  5. type of finish
    - polished, glazed, bisque
  6. desired lab case turn around time
25
Q

most important features dentists look for when choosing a laboratory

A
  1. high quality work
  2. good communicaton
  3. reasonable prices
  4. easy relationship
  5. fast turnaround time
26
Q

type of finish

A

when and what

  • polished
  • glazed
  • bisque
27
Q

can you do suc down over wax up

A

no

28
Q

pick up impressions done when?

A

after do frame try in

try in and make model of it - with GC resin

29
Q

master cast aka

A

die cast

Fixed Prosth 3rd year (17 decks)

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