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Fixed Midterm Spring > 4. Lab Considerations I > Flashcards

4. Lab Considerations I Flashcards

1
Q

Polyether is hydro-(philic/phobic)

A

philic

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2
Q

Gluteraldehyde can be used to disinfect what impression materials

A

polysulfide and silicones

-NOT polyether, reversible and irreversible hydrocolloids

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3
Q

Iodophors

A

-Irreversible and reversible hydrocolloids, polysulfides, silicones and polyethers

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4
Q

Chlorine compounds can be used to disinfect what impression materials

A

-Irreversible and reversible hydrocolloids, polysulfides, silicones and polyethers

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5
Q

Complex phenolics can be used to disinfect what impression materials

A

Ye

  • Polysulfide
  • Silicones

No

  • Polyehter
  • irreversible hydrocolloid
  • not enough data for reversible hydrocolloid
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6
Q

Phenolic gluteraldehyde can be used for what impression materials

A

Yes

  • Reversible hydrocolloid
  • Polysulfide
  • Silicone

No

  • Polyether
  • Irreversible hydrocolloid
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7
Q

Common concerns of lab techs

A
  • Insufficient info on work authorization
  • Unsatisfactory tooth preps
  • Deficient impressions
  • Inadequate occlusal instruction and records
  • Lack of knowledge of dental technology
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8
Q

ADA guidelines establishing the responsibilities of the dentist are

A
  • Provide a signed, writeen and detailed instructions
  • Accurate impressions, casts, occlusal records, and mounting
  • ID finishlines (when not obvious)
  • Indicate preferred materials with shade description
  • Realistic
  • Approval to proceed with modifications
  • Infection control
  • Return all casts for remakes
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9
Q

when is it the dentist’s responsibility to ditch the die

A

when the finishline isn’t clear (otherwise it can be done by the lab)

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10
Q

ADA responsibilities of the lab

A
  • Follow dentist instructions
  • Review unclear/questionable items
  • Match shade described
  • Notify dentist if work can’t proceed
  • Complete work in timely manner
  • Inform dentist of materials used
  • Follow infection control
  • Inform dentist of subcontracting
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11
Q

Metal issue card is needed for what crowns

A

CCC or PFM

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12
Q

Jade stone should set for how long

A

1 hr

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13
Q

What material is most commonly used for master casts

A

Gypsum

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14
Q

Advantages of gypsum

A

0Dimensionally accurate

  • Low cost
  • Easy to use
  • Compatible with all impression materials ** Big advantage**
  • Quick setting time
  • **Capable of reproducing a 20 um wide line as prescribed by the ADA specification No. 19 for elastomeric impression materials
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15
Q

Disadvantages of gypsum

A
  • Setting expansion
  • Vulnerable to fracture upon retrieval from impression
  • Poor abrasion resistance
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16
Q

Another name for resin rock is

A

epoxy resin

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17
Q

Advantages of resin rock are (compared to gypsum)

A
  • Better abrasion resistance (due to reinforcement from resin)
  • Less expansion (has resin which shrinks)
  • Excellent surface details
  • Stronger than gypsum –> resists fracture
18
Q

Disadvantages of resin rock

A
  • Technique sensitive
  • Time consuming, long setting time
  • Incompatible with some impression materials
  • Polymerization shrinkage
19
Q

What impression materials are not compatible with resin rock

A

polysulfide and hydrocolloid

20
Q

Describe the process of making and electroplated die

A
  • Impression placed in electroplating bath

- Later pure silver or copper is deposited on impression and supported with type IV stone/resin

21
Q

Advantages of electroplated dies are

A

-Excellent abrasion resistance

22
Q

Disadvantages of electroplated dies are

A
  • Technique sensitive
  • Time consuming
  • Expensive
  • Impression material incompatibility (Polyether, PVS= hard to plate)
23
Q

Why should the master cast of the pindex only be 10 mm thick

A
  • Avoid mounting issues

- Makes cuts easier

24
Q

What are the critical features of adequate dies

A
  • Accurately reproduce the teeth/preps
  • Finish lines are accessible and clearly marked
  • Seat completely in master cast base
  • Are stable. No rocking, rotation/wobbling
  • Independently removable
  • Acces to end of pin
25
Q

What must be returned to the lab if you are requesting a remake and why

A
  • Old restoration
  • Working casts
  • Quality control from case of remake
  • *Prevent repetition of mistakes
26
Q

What are the minimum enclosures when submitting a case to the lab

A
  • Working cast (pindex)
  • Solid pour cast (must be full arch esp if it is zirconia
  • Impression
  • May also need bite reg. and mounted Dx casts
27
Q

What does the lab need if you are submitting work for a survey crown for a partial

A
  • RPD Design
  • Tripoded survey cast
  • Intraoral preps must be done before survey crown
28
Q

What are the different MCC margin designs

A
  • Metal margin
  • Metal ceramic margin
  • Ceramic margin
29
Q

Different names for…

  • Metal margin
  • Metal ceramic margin
  • Ceramic margin
A
  • Metal margin –> metal collar
  • Metal ceramic margin –> Metal Ceramic margin –> disappearing metal margin
  • Ceramic margin –> porcelain margin
30
Q

Which MCC margin design is the least and most esthetic

A 
Least= metal collar (or metal margin) 
Most= ceramic/porcelain margin
31
Q

What is the most and least conservative MCC margin

A 
most= metal margin (metal collar)
Least= ceramic margin
32
Q

What burs are used for the following margins

  • Metal margin
  • Metal ceramic margin
  • Ceramic margin
A
  • Metal margin = chamfer
  • Metal ceramic margin= Deep chamfer or slanted shoulder
  • Ceramic margin = radial (or modified) shoulder
33
Q

When are you likely to perscribe a metal occlusal on an MCC

A
  • Limited restorative space

- Opposing metal restoration (if porcelain is highly polished it should be ok)

34
Q

Define a high noble alloy

A
  • Noble metal content > or equal to 60%

- Gold > or equal to 40%

35
Q

Define titanium alloy

A

> or equal to 85%

36
Q

Define Noble Alloys

A

> or equal to 25%

37
Q

Define Base alloys

A

<25% noble

38
Q

Metals of the platinum group include

A
  • PT
  • Pd
  • Rhodium
  • Iridium
  • Osmium
  • Ruthenium
39
Q

What are the options for a noble alloy for a PFM and CC

A

PFM
-High Pd (white)

CCC

  • Silver- PD or Ag-Pd (White)
  • Au 40% (yellow)
40
Q

High noble gold has _% Au

A

70

41
Q

What return specs for the restoration do you want

A
  • Polished metal

- Glazed porcelain

Fixed Midterm Spring (9 decks)

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