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AU17 - Dental Materials 3 Final > Implants > Flashcards

Implants Flashcards

1
Q

What are the three components of an implant?

A

implant Fixture
implant Abutment
implant Restoration

(FAR)

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2
Q

What are the desired properties of the implant fixture (the part in the bone)?

A
  • sufficient strength to withstand occlusal force
  • elastic modulus to withstand permanent deformation and optimum force transfer
  • oxide layer to promote integration
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3
Q

True or False: the Oxide layer inhibits integration.

A

False, promotes!

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4
Q

The ____, _____, and _____ contribute to bone formation on the implant surface.

A

osteoblasts
osteoid
mineralized matrix

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5
Q

What consistutes a stable oxide film on the implant surface?

A
  • stability over various pH
  • protective
  • good adherence
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6
Q

______ has excellent bio-compatibility.

A

Titanium

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7
Q

True or False: Titanium is corrosion resistant.

A

True

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8
Q

Titanium has low ____ and is _____.

A

density

light weight

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9
Q

What is the alpha and beta phase of titanium?

A

alpha: hexagonal, close-packed lattice
beta: body-centered cubic

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10
Q

The four grades of commercially pure titanium are based on impurities of ____, _____, and _____.

A

oxygen
iron
Nitrogen (..and maybe Carbon/Hydrogen too)

I.O.N

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11
Q

Which grade of titanium is purest?

A

Grade I

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12
Q

Which grade of titanium is the softest?

A

Grade I

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13
Q

Which type of titanium is commonly used?

A

Type 4

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14
Q

Which elements are used as alpha-stabilizers in titanium alloys?

A

aluminum, carbon, gallium, oxygen, nitrogen

C.O.N.G.A

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15
Q

Which elements are used as beta-stabilizers in titanium alloy?

A

nickel, copper, palladium, vanadium

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16
Q

Which type of titanium is most commonly used for implants?

A

Ti-6Al-4V

```
aluminum = alpha
(vanadium = beta)
~~~

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17
Q

What type of implant has been newly developed to use as an esthetic solution for thin gingiva?

A

zirconia

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18
Q

True or False: Yttria Oxide is added to zicronia to stabilize it at room temperature.

A

True

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19
Q

Typical dimensions of a one-piece zirconia dental implant.

A
  1. 1, 3.3mm diameter

4. 0, 5.5mm abutment height

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20
Q

True or False: there is a combo titanium-zirconium implant.

A

True

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21
Q

What is the percent zirconia in a combo implant?

A

13-17 %

22
Q

What are the benefits to a zirconia-titanium implant?

A 
higher tensile strength
better bone integration
more bone growth
higher removal torque 
better for narrow spaces
23
Q

How can the implant surface be altered (four ways).

A

Plasma Spraying
Grit Blasting
Acid Etching
Anodization

24
Q

What is plasma spraying?

A

coating of the titanium surface with hydroxyapatite, fluorapatite, or calcium phosphate

25
Q

What is grit blasting?

A

micro-abrasive blasting with titania, alumina, or calcium phosphate

26
Q

What is acid etching?

A

roughening of the implant surface via hydrochloric acid, sulfuric acid, or nitric acid at high temperatures

27
Q

What is anodization?

A

oxide films are deposited on surface through an electrochemical reaction in order to improve adhesion and bonding
Anode = titanium
Acid = electrolyte

28
Q

What are three examples of biologic coatings that can be added to the implant surface?

A
  • statin- BMP
  • Antibiotics
  • Growth Factors (TGFbeta, BMP, etc.)
29
Q

True or False: Zirconia and Titanium abutments can be either prefabricated or custom.

A

True

30
Q

True or False: Cast noble metal alloy abutments are custom made only.

A

True, they cannot be prefab

31
Q

True or False: Zirconium is higher in density, Knoop hardness, and Young’s Modulus than titanium.

A

True

32
Q

Describe the milling of zirconia.

A
  1. a thick disc (98mm) is pressed in its green state
  2. dry milling
  3. sintered with stains added
  4. feldspathic procelain added
33
Q

Abutments of zirconia are either milled as one piece or a ______ is cemented.

A

titanium base

34
Q

An impression is either ____ level or ____ level

A

implant (fixture)

abutment

35
Q

True or False: the implant level impression can be closed tray or open tray.

A

True

36
Q

True or False: the Abutment level impression can be closed tray only.

A

True

37
Q

For an implant level impression, the impression is taken ______.

A

subgingivally at the fixture level

38
Q

For an abutment level impression, the impression is taken ____.

A

at the level of the restoration

39
Q

What type of alloy is used for cast abutments?

A

Type 2 or 3

40
Q

For a screw retained implant crown, describe the steps of fabrication.

A
  1. waxed
  2. cut back
  3. cast
  4. porcelain applied
41
Q

In designing an abutment via CAD/CAM, what are three characteristics that are controlled?

A
  • height-to-base ratio
  • taper
  • ensure support for restoration
42
Q

True or False: Titanium abutments can be anodized with gold hues for the anterior esthetic region

A

True

43
Q

Titanium abutments typically have ____ retained crowns.

A

cement

44
Q

What is the main benefit of cement retained crowns? other benefits?

A

esthetics

familiar
passive seating
no access hole

45
Q

What is a disadvantage of cement-retained restorations?

A
  • must have retention and resistance form in abutment

- residual cement could cause soft tissue irritation

46
Q

What is the main advantage to screw-retained restorations? other advantages?

A

retrievable

one piece
good for short crowns
good for soft tissue
visibility of access hole

47
Q

What are the disadvantages to screw retained restorations?

A

lab cost

visibility of access hole

48
Q

For anterior implants: Zirconia abutments can pair with _____ or _____.
Titanium abutments can pair with ______.

A

Zirconia:

  1. Zirconia crown
  2. Lithium Disilicate crown (emax)

Titanium:

  1. PFM crown
  2. NOOOOO all ceramic (show through)
49
Q

True or False: For posterior implants, it is acceptable to place a zirconia crown or PFM crown on a titanium abutment.

A

True

50
Q

True of False: Screw retained crowns are most often PFM.

A

True

51
Q

Frameworks for implant supported dentures or FPDs can be of what materials?

A
  1. nobel metal
  2. titanium
    * 3. zirconia= only for FPD and hybrids
  3. Milled Poly-ether (PAEK, PEEK, PEKK)
52
Q

Which poly-ether material has greater compression strength and is light-weight/rigid?

A

PEKK

that’s the one
i’d pick (pekk)

AU17 - Dental Materials 3 Final (6 decks)

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