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Fixed Prosthodontics > Quiz 3 - Spring > Flashcards

Quiz 3 - Spring Flashcards

1
Q

What is the definition of a precision attachment?

A

A male/female (patrix/matrix) type mechanism manufactured to precise tolerances utilized to securely and reversibly connect a dental prosthesis to a tooth or implant

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2
Q

What are the three different attachment types?

A
  1. Overdenture
  2. Intracoronal
  3. Extracoronal
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3
Q

What is the definition of an overdenture?

A

A removable dental prosthesis that is supported and or retained by natural tooth roots and or implants and mucosa

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4
Q

What is an overdenture attachment?

A

A prefabricated mechanism for the support and or retention of a removable dental prosthesis, with the male and female components positioned between the coronal portion of natural tooth roots or implants and the intaglio surface of the prosthesis

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5
Q

What type of attachments are Zest and ZAAG and how do they differ?

A

They are overdenture attachments. Canines can be cut off and a ball and socket on the denture is inserted into a groove on the canine. A ZAAG is a zest concept with the addition of a housing to facilitate replacement of the male

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6
Q

What is a stud overdenture attachment?

A

A ball and socket type attachment in which the male component is attached to an abutment tooth or implant and the female component is retained within the intaglio surface of the removable prosthesis. A lot like the Zest but in reverse.

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7
Q

What are the different types of stud overdenture attachments?

A

Castable, threaded cast-to, threaced direct bond, direct threaded, direct one-piece

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8
Q

What is the definition of an intracoronal attachment?

A

A prefabricated mechanism for the support and or retention of a removable dental prosthesis, with the male and female components positioned within the normal contours of the abutment tooth

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9
Q

What is the definition of an extracoronal attachment?

A

A prefabricated mechanism for the support and or retention of a removable dental prosthesis, with the male and female components positioned outside the normal contours of the abutment tooth

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10
Q

What is a stress breaker/stress director?

A

A device or system that relieves specific dental structures of part or all of the occlusal forces and redirects those forces to other bearing structures or regions.

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11
Q

Shorten moment arms, control leverage and save teeth. True or False?

A

True

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12
Q

What does the verb to cope mean?

A

To cut the end of a molding to match the contour of the adjacent piece, or to cut structural steel beams so that they fit tightly together

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13
Q

What does the verb to cope mean in dentistry?

A

To dress, cover or furnish with a cope; to cover, as with a cope or coping

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14
Q

What is a coping?

A

The top, typically sloping course of a brick or stone wall. The protective top member of any vertical construction such as a wall or chimney

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15
Q

What is a coping in dentistry?

A
  1. A sub structure for a fixed dental prosthesis
  2. Used for implant level impressions, as in impression coping or impression post
  3. Covering or cap made to fit over the coronal portion of a tooth root
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16
Q

What are some examples of coping in dentistry?

A

The cast metal coping on a PFM, crown and bridge copings, impression copings

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17
Q

What are the different types of implant/abutment interfaces?

A
  1. Internal hex
  2. External hex
  3. Internal bevel
  4. External bevel
  5. Spline
  6. Tri-Lobe
  7. Morse Taper
  8. Combinations
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18
Q

When was the Morse Taper invented and why?

A

Invented in 1864 by Stephen A. Morse, and it was developed to join two rotating machine components. It is a cone in cone joint. It is made up of a trunnion (male) and a bore (female).

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19
Q

What did the research conclude regarding microbial leakage through the implant/abutment interface of Morse taper implants in vitro?

A

Both Morse taper implant connection systems, the tapped-in (Bicon) and screwed-in (Ankylos) showed bacterial leakage along the implant/abutment interface

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20
Q

What are the advantages of partial-coverage gold?

A

Most conservative of all indirect restorations, compatible with opposing occlusion, biocompatible (type II), still the “gold standard”, appearance

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21
Q

What are the disadvantages of partial-coverage gold?

A

Technique sensitive, cost, appearance

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22
Q

What are the indications for a partial-coverage gold?

A

Teeth with moderate damage, but largely intact axial walls, patients who either want the gold look or do not mind the gold look, patients who from a functional standpoint want the finest, patients with excellent oral hygiene

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23
Q

What are the contraindications for a partial-coverage gold?

A

Patients with low appreciation for fine dentistry, patients who either dislike or have reservations about gold display, and patients with poor plaque control habits

24
Q

What is the depth for a gold onlay functional cusp?

A

1.5 mm

25
Q

What is the depth for a gold onlay non-functional cusp?

A

1.0 mm

26
Q

What is the depth for a gold onlay functional cusp bevel?

A

1.5 mm

27
Q

What is the depth beyond occlusal reduction for an isthmus on a gold onlay?

A

0.5-1.0 mm

28
Q

What is the box depth beyond pulpal floor of isthmus for a gold onlay?

A

1.0 mm

29
Q

What is the width of the 360 marginal bevel on a gold onlay prep?

A

0.5 mm

30
Q

Dimensions of isthmus and boxes should not be determined by existing restorations and or caries. True or False?

A

False, they are often determined that way

31
Q

Basing to ideal is often indicated, but cannot be relied upon for retention. True or False?

A

True

32
Q

What are the principles of gold onlays?

A

Adequate internal retention, beveled margin everywhere, base up to ideal, if indicated, with ideal being isthmus form and box form, this is our retention and resistance form

33
Q

Taper is especially important with partial-coverage gold. True or False?

A

True. Stay within 6-10 degree range

34
Q

What do grooves help prevent with gold onlays?

A

Perpendicular movements/dislodgements of restorations.

35
Q

You should keep the maxillary buccal cusp bevel relatively flat for a gold onlay. True or False?

A

True

36
Q

Why is it acceptable not to have an acute angle of gold alloy at the buccal margin?

A

This is an easier margin to finish and maintain

37
Q

Where do retentive failures most commonly occur with gold onlays?

A

At the cement-restoration interface

38
Q

What can you do to the intaglio surface to improve retention for a gold onlay?

A

Roughen the intaglio surface of the restoration. Airborne particle abrasion with 50 micrometers alumina can increase retention by as much as 64%

39
Q

What about onlays and fillings on the same tooth?

A

His slide was blank

40
Q

What is the diameter of a 1557 carbide bur? And how long is the flute?

A

1.0 mm and 4.0 mm

41
Q

How supragingival should you stay with your box for a gold onlay?

A

At least 1.0 mm

42
Q

What is occlusal reduction for a gold onlay influenced by?

A

Ideal tooth form and inter-occlusal clearance

43
Q

What is the diameter of the 172 carbide at the tip, at the shank, and how long is the flute in length?

A
  1. 0 mm at tip
  2. 6 mm at shank
  3. 0 mm flute
44
Q

What is the diameter of the 010 diamond and how long is its flute?

A

0.9 mm in diameter, and 8.0 mm in length

45
Q

What does the functional cusp bevel, occlusal reduction, and occlusal shoulder help with for a gold onlay?

A

Structural durability

46
Q

What does the buccal bevel, proximal flare, and chamfer finish line help with for a gold onlay?

A

Marginal integrity

47
Q

What do proximal grooves help with for a gold onlay?

A

Retention and resistance, stuctural durability

48
Q

What does the axial reduction help with for a gold onlay?

A

Retention and resistance, structural durability, periodontal preservation

49
Q

For the 3/4 gold crown, what should the axial reduction be at the margin?

A

0.5 mm

50
Q

Where should mesial and distal retention grooves be placed?

A

Just buccal to proximal contact areas, and 0.5-1.0 mm supra-marginal

51
Q

Mesial and distal grooves are more common retentive features than isthmuses and boxes. True or False?

A

False, isthmuses and boxes are

52
Q

Basing to ideal is often indicated, but cannot be relied upon for retention. True or False?

A

True

53
Q

Retention grooves must be in dentin. True or False?

A

True

54
Q

What is the diameter at the tip, shank, and total length of the 6878K-012 diamond?

A

0.6 mm at tip, 1.2 mm at shank, and 8.0 mm in length

55
Q

What is the diameter at the tip, shank, and flute length of the 170 carbide?

A

0.6 mm at tip, 0.8 mm at shank, and 4.0 mm in length

Fixed Prosthodontics (8 decks)

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