Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Fixed III > Exam 1 > Flashcards

Exam 1 Flashcards

1
Q

What is an abutment?

A
  • part of a structure that directly receives thrust or pressure
  • a tooth/portion of a tooth or that partion of a dental implant that serves to support and/or retain a prosthesis
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is a retainer?

A

-any type of device used for the stabilization or retention of a prosthesis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a pontic?

A

-an artificial tooth on a fixed dental prosthesis that replaces a missing natural tooth, restores its function, and usually fills the space previously occupied by the clinical crown

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the main biologic considerations for an FDP?

A
  • prevention of adjacent tooth damage, soft tissue damage or pulpal injury
  • conservation of tooth structure
  • future dental health
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the mechanical considerations for an FDP

A
  • retention
  • resistance
  • preventing deformation of the restoration
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the esthetic considerations for an FDP?

A
  • all ceramic
  • metal ceramic
  • material considerations
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are some of the main ways to conserve tooth structure?

A
  • partial coverage crowns
  • minimum practical convergence angle
  • follow anatomic planes to give uniform thickness
  • selection of conservative margin geometry
  • avoid unnecessary apical extension of the preparation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Porcelain margins can be finished to what closeness of cement?

A

-50 micrometers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What issues are created by irregular/rough margins?q

A

-reduction of adaptation accuracy of restoration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the benefits of supragingival margin placement?

A
  • no soft tissue trauma
  • easy to clean
  • easier impression
  • easy to evaluate
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What are conditions requiring a subgingival margin?

A
  • dental caries, cervical erosion, or esthetic zone
  • proximal contact extends to gingival crest
  • additional retention/resistance needed
  • root sensitivity
  • associated with RPD
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What are the advantages of diagnostic casts?

A
  • for fixed restorations
  • fabrication of provisionals
  • fabrication of custom trays
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Mounted diagnostic casts are used for what?

A
  • evaluation of occlusal plane
  • interarch clearance
  • treatment position
  • change in VDO
  • occlusal analysis
  • esthetic analysis
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the three components of retention?

A
  • taper
  • length
  • surface area
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is total axial convergence?

A

-sum of the taper of two opposing preparation walls

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the sloped shoulder margin design used for?

A
  • PFM crowns FPD
  • no metal collar
  • improved esthetics
  • less intrusion into gingival crevice
  • simple laboratory construction
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What are the disadvantages of a sloped shoulder?

A
  • more difficult preparation
  • greater marginal creep
  • rough marginal area
  • potential gray line
  • lab tends to overcontour
  • higher lab cost
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What are the absolute indications of the porcelain butt margin?

A
  • minimal sulcus depth of 1mm or less
  • thin labial tissue
  • high smile line
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What are the real indications of the porcelain butt margin?

A
  • margins in the esthetic zone

- which is where the patient says it is

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is ante’s law?

A
  • in order to maintain a stable FPD, there are several considerations
  • the total periodontal membrane area of the abutment teeth must equal or exceed that of the teeth to be replaced
  • extensions of the primary abutment must correspond to the distance of the lever arm that the pontics exert
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

For extended restorations, what are some options in order to not have an FPD fail?

A
  • non-rigid connectors

- cantilever pontic

22
Q

What are ceramics?

A

-products made from a non-metallic inorganic material processed by firing at high temp to achieve desirable properties

23
Q

First porcelain jacket crown by Pierre Fauchard was made when?

A

-1800

24
Q

First ceramic crown was introduced by charles lind when?

A

-1903

25
Q

Which fusion groups of dental ceramics are used for denture teeth and porcelain jacket crowns?

A

-High and medium fusion 1090-1370*C

26
Q

Which fusion groups of dental ceramics are used for metal ceramic crowns?

A

-Low and ultra-low fusion <1070*C

27
Q

What is feldspar?

A
  • naturally occurring glass that contains silica, fluxes and alumina all neatly bound together
  • fused @ high temp
28
Q

What is a frit?

A

-small fragments generated by the fracture of dental porcelain when Feldspar, quartz and other oxides are heated @ high temp

29
Q

How thick does the metal for the FDP have to be?

A

-0.5mm

30
Q

Metal surfaces are prepared to receive porcelain with what grinding stone?

A

-pink

31
Q

How are metal crowns oxidiized?

A

-fired in air in oven 1200-1900*F

32
Q

What are the 3 types of porcelain particles used in MCCs?

A
  • opaque- containing opacifying oxides
  • body/dentin porcelain- translucent and contains metal oxides that give base color selected
  • incisal/enamel- more translucent than body porcelain
33
Q

What is the process of opaque application?

A
  • mix paste, apply with paintbrush and bake

- bake @ 1800*F 1min under vacuum

34
Q

What burs are safe for the adjustment of metal ceramic and ACC?

A

-low speed handpiece with stones or diamond burs designed for porcelain

35
Q

What do you have to do before the 2nd bake?

A

-clean crown in ultrasonic and add porcelain to deficient areas

36
Q

What are the advantages to the porcelain labial margin?

A
  • improve esthetics

- less plaque retention

37
Q

What are the disadvantages to the porcelain labial margin?

A
  • inferior marginal adaptation compared to cast metal
  • decreased strength
  • more time consuming/difficult
  • more expensive
38
Q

What are the advantages of the direct lift technique?

A

-least time consuming

39
Q

What are the disadvantages of the direct lift technique?

A
  • shoulder porcelain needed

- slightly rough margins

40
Q

What is a lucia jig?

A

used to maintain VDO in CR

like an incisal guide table

41
Q

What is the main reason for FPD failure?

A

-Caries

42
Q

What are the main considerations for success of the FPD?

A
  • minimize sliding contacts
  • establish anterior guidance
  • have opposing contacts in same material
  • control parafunction
43
Q

What is the distance from the junction between two materials that occlusal contacts have to be?

A

-1.5 mm

44
Q

What is the mechanism for glass-to-metal bonding?

A
  • glass will adhere to clean, gas-free metal if covered with adherent oxide and temperature raised where oxide is partially dissolved into glass
  • strain free if coefficients of thermal expansion are the same over the entire temperature range
45
Q

What is adhesive failure @ the porcelain metal interface of an MCC?

A

-happens @ porcelain metal interface due to missing oxide layer (lab problem)

46
Q

What is adhesive failure @ metal-oxide - metal interface due to?

A

-contaminated metal (lab problem)

47
Q

What is adhesive failure at the porcelain - metal-oxide interface due to ?

A

-contaminate metal oxide (lab problem)

48
Q

What is cohesive failure in the porcelain due to?

A

-maximum strength reached (patient problem)

49
Q

What is cohesive failure in metal oxide due to?

A

-excessive oxidation (lab problem)

50
Q

What are the key characteristics of framework design?

A
  • even porcelain thickness (established by waxing)
  • rounded internal angles
  • 90* metal/porcelain junction
  • Porcelain wrap around
  • metal thickness at least 0.3 mm

Fixed III (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions