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Fixed final > Sweep 2 > Flashcards

Sweep 2 Flashcards

1
Q

Delivery sequence

A 
prox contacts
Marginal integrity
Stability
Occlusion
Contouring (gingival third, etc)
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2
Q

Pre-ceramic soldering

DISADVANTAGES

A

Difficult (narrow melting range) • Volatilization of base metal (overheating)
• Microporosity or pitting
• Not good bond with porcelain • Color
• Corrosion

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3
Q

POST-CERAMIC SOLDERING

advantages

A

Less chance of sag or deformation of the framework
• Slightlyweaker andmorebrittlesolder joint since framework can’t be quenched • Small gap space for solder = incomplete
joint
• Large gap space for solder = decreases
strength, higher porosity, higher meniscus, more difficult to solder

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4
Q

• TORCH SOLDERING

A

Use for pre-ceramic soldering mc FDP soldering full gold FDP s
Difficult for post-ceramic soldering

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5
Q

OVEN SOLDERING

A

Use for pre and post-ceramic soldering

Can use vacuum Visualization is more difficult

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6
Q

INFRARED SOLDERING

A

Can be used for low-fusing connectors and pre-ceramic soldered joints
Uses special unit with an infrared light

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7
Q

Graphite or iron oxide (rouge) with turpentine as a solvent are often used as

A

antiflux

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8
Q

SOLDERING FLUX

A

A substance applied to the metal surface to be soldered to remove oxides or prevent their formation.

Borax Glass (Na2B4O7) used with Au alloys.
Other fluxes available for non Au alloys are available, some of their formulas are not published.
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9
Q

SOLDERING INVESTMENTS

A

• Are similar to regular casting investments. • Contain fused quartz (lowest expanding
form of silica) as a refractory component.

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10
Q

POST-CERAMIC SOLDERING HEATING SCHEDULE

A
  1. Burn-out Duralay in burnout oven 15-20 minutes at 300 oF
  2. Place in porcelain oven at 1200 oF and allow all carbon residue to be eliminated.
  3. Coat piece of solder with small amount of flux (do not allow the flux to contact porcelain).
  4. After a few minutes (3 min) raise temperature to 1620 oF and watch through the furnace door until solder melts.
  5. Remove immediately and lower furnace temperature and evaluate solder joint.
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11
Q

In order to ensure contact with the ridge intra-orally, the ——– should be scraped smooth to a depth no more than ——-mm (Technician usually does this

A

cast ridge

0.25

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12
Q

Mand pontics

A

Mod ridge lap = low resorption
Ovoid- med resorption
Sanitary - lots of resorption

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13
Q

Mod ridge lap

A

T contact

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14
Q

Metal connectors:

A

2mm x 2mm ideally

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15
Q

Connector shape

A

heart shaped

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16
Q

Most acrylics react with eugenol, but

A

normally not enough to create a problem. Allows for eugenol cements. Composites don’t work with eugenol, all ceramic crowns don’t either. Problem is that you need to clean later.

17
Q

PMM Advantages:

A
  • Best abrasion resistance • Best color stability
  • Good polishability
  • Good marginal finish
18
Q

PMM Disadvantages:

A
  • High heat polymerization (165o) • High shrinkage
  • Monomer irritant to pulp
  • Eugenol deteriorates resin
19
Q

PMM Indications:

A
  • Indirect techniques

* Long-term provisionals • Conventional provisionals • Long span provisionals

20
Q

PEM Advantages:

A
  • Low shrinkage
  • Rubber stage to set
  • Longer working time
  • Lower polymerization time • 125oF
21
Q

PEM Disadvantages:

A
  • Poor hardness
  • Poor abrasion resistance • Poor color stability
  • Poor finishability
  • Eugenol deteriorates resin
22
Q

Hybrids Advantages:

A
  • Low shrinkage

* Corrected by additions • Can be radiopaque

23
Q

Hybrids Disadvantages:

A

• Brittle
• Repairsandmixingaremore
difficult • Expensive

24
Q

Hybrids Indications:

A

• Long span restorations • Long term provisionals

25
Q

CHROMA (———–) Adjustment:

Yellow increases chroma on yellow shade Orange has same effect on yellow-red shade

A

saturation

26
Q

HUE (——) Adjustment:

Pink-purple moves yellow toward yellow-red Yellow decreases the red of a yellow-red shade.

A

color

27
Q

§ A restoration with a high ——– is difficult to modify

A

CHROMA

28
Q

§ Choosing a shade with a lower CHROMA is always better since is

A

easier to alter.

29
Q

§ Using a complementary color of the shade reduces its

A

CHROMA
yellow requires violet
Blue requires green

30
Q

Adding stains lowers the ——— (dark or

light) of the restoration and increases the metameric effect.

A

VALUE

31
Q

VALUE adjustment:

A

Attempting to increase value is difficult, but can be increased if the dominant color added has a higher lightness ranking.
For example white stain can be used but will increase opacity.

Fixed final (3 decks)

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