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4th Year Revision > Fixed Prosthodontics > Flashcards

Fixed Prosthodontics Flashcards

1
Q

What is the occlusal reduction for ceramic or composite?

A

Between 1 and 1.5mm occlusal reduction

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2
Q

How do diamond burs remove tooth tissue?

A

By abrasion

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3
Q

What are the similarities of luting cements and adhesive cements? (4)

A
  • good flow properties
  • thin film thickness
  • sets hard
  • broken down by shearing force
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4
Q

What are the indications for GI as a core material?

A

If there are 2+ intact tooth walls remaining and they must be 1-2mm thick (the material does not have sufficient strength on its own)

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5
Q

What are the advantages of amalgam as a core material? (2)

A
  • not technique sensitive

- can be bonded

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6
Q

What are the disadvantages of amalgam? (2)

A
  • low tensile/compressive strength

- not adhesive

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7
Q

What are the disadvantages of GI and RMGI as a core material? (2)

A
  • low compressive/tensile strengths

- deteriorate at low pH

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8
Q

What is the technique for doing a bonded amalgam?

A
  • complete cavity prep
  • place lining if necessary in deep aspects
  • etch enamel 20 secs, dentine 10 secs
  • rinse and dry
  • dentine bonding agent and light cure
  • place adhesive resin cement on base and walls of the cavity
  • pack amalgam onto unset cement and wipe away excess panavea
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9
Q

What are the uses of an average value articulator? (3)

A
  • posterior restorations where obvious canine guidance
  • multiple restorations with obvious guidance on other teeth
  • complete removable prosthesis
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10
Q

What are the uses of semi adjustable articulators? (5)

A
  • multiple units
  • re organised occlusion
  • group function
  • anterior guidance
  • occlusal analysis
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11
Q

What are the components of a face bow? (4)

A

Bite fork- records the position of the teeth
Bow- records the position of the terminal hinge axis to the condyle
Jig- connects the bow and bite fork
Pointer for 3rd reference point- to align teeth to horizontal access

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12
Q

What material do you use for the mono phase impression technique?

A

Polyether or med viscosity silicone

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13
Q

What are the methods used to create a provisional restoration? (5)

A
  • pre operative putty impression
  • pre formed crown
  • pre operative wax up followed by duplication and vacuum formed stent
  • free hand bis acrylic resin
  • use the old crown if there is one
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14
Q

What goes into the pre operative putty?

A

Chemically cured bis acrylic composite resin e.g pro temp or integrity

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15
Q

What are the advantages of polycarbonate? (3)

A
  • bonds to inside of crown
  • doesn’t fall apart when trimmed
  • can be polished
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16
Q

Why should a non-eugenol cement be used to place a resin provisional crown?

A

Eugenol is thought to inhibit polymerisation

17
Q

What are the advantages of fixed moveable bridgework? (3)

A
  • good track record
  • solution for alignment problems
  • use of different materials possible
18
Q

What are the disadvantages of fixed moveable bridgework? (4)

A
  • limited areas of use
  • complicated
  • expensive
  • increased stress on major abutment
19
Q

What are the functions of poetics? (4)

A
  • replacing the function of the lost tooth
  • achieve an aesthetic appearance
  • enable adequate oral hygiene
  • prevent tissue irritation
20
Q

What is the anterior pontic design?

A

Modified ridge lap

21
Q

How can you assess undercuts in conventional fixed fixed bridge preps? (4)

A
  • direct monocular vision
  • indirect monocular vision
  • take an alginate impression and cast in quick setting plaster
  • paralleling mirror
22
Q

Is it best to preserve or remove the cingulum when preparing anterior teeth for indirect restorations?

A

Leave the cingulum

23
Q

What are the requirements of current day resin retained bridges? (3)

A
  • wing retainer must be rigid
  • wing must fit closely to abutment tooth
  • porcelain fused to metal
24
Q

What are the indications for current day resin retained bridges? (4)

A
  • unrestored or minimally restored abutment teeth
  • sufficient good quality enamel on abutment tooth
  • sufficient interocclusal space
  • good alveolar bone shape
25
Q

What cements give the most retention? (2)

A
  • zinc phosphate cements give more retention than polycarboxylate cements
  • composite resin luting cements can give superior retention if the smear layer is removed from the walls of the post space preparation
26
Q

When would you use a customised incisal guidance table?

A
  • class I and class II div II (as they are involved in anterior or lateral guidance)
  • when need to customise palatal surfaces of upper anteriors
  • would use it when doing restorations on all anterior upper teeth, wouldn’t just use it if doing if doing a bridge on a central
27
Q

If you are doing a crown or bridge on a tooth that is not the guidance tooth do you need a face bow and semi adjustable articulator?

A

No

28
Q

What is a RRB cemented with?

A

Panavia

29
Q

What would you use to cement a cast metal post or fibre post?

A

Rely x unicem

30
Q

What cement would you use to cement a post core and crown, MCC, all ceramic crown or crown with a reinforced core?

A

Rely x luting cement

31
Q

What is used to cement veneers?

A

Colebra

32
Q

Why is RMGI not good for cementing?

A

Absorbs water and could fracture restorations

33
Q

What are the ideal characteristics of cements?

A
  • thin
  • flowable
  • not too acidic
  • insoluble
  • easy to use

4th Year Revision (12 decks)

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