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Tim's Cards > Fixed Q3 > Flashcards

Fixed Q3 Flashcards

1
Q

The combined width of Connective Tissue and Junctional Epithelial attachment formed adjacent to a tooth and superior to the crestal bone.

A

Biological Width

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2
Q

From top to bottom: 1mm

1mm

1mm

A

Gingival sulcus (pocket depth)

Junctional Epithelium

Connective Tissue attachment

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3
Q

T/F

Biological width can vary from pt to pt

A

True

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4
Q

How do you measure Biological Width?

A

Sound to Bone

(subtract sulcus depth)

***done under anesthesia

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5
Q

If a crown prep does not follow soft tissue contour what might happen?

A

Violation of Biological Width by Crown Margin

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6
Q

If a crown margin is placed within the Junctional Epithelium or Connective tissue what has occurred?

A

Violation of Biological Width

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7
Q

2 Things happen if you violate Biological Width:

A

Inflammation

Bone Loss

*body will try to re-establish Bio Width

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8
Q

What defines the bone loss in the case of an Iatrogenic violation of Biological Width?

A

Uncontrolled/unpredictable

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9
Q

Where is unpredictable/uncontrolled bone loss more likely to occur in the case of Bio Width violation?

A

Thin Alveolar Bone

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10
Q

What plays a major iatrogenic role in the recession of bone around thin areas?

A

Trauma from restorative procedures

*like BioWidth violation

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11
Q

What are 2 factors inherent in the Pt that affect the outcome of iatrogenic trauma to the BioWidth?

A

If Gingiva Thick/Fibrotic or Thin/Fragile

Peridontium Scalloped or Flat

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12
Q

What type of gingiva is more prone to recession?

What type is less prone?

A

Highly scalloped thin

Thick and Fibrous

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13
Q

What factor correlates to the Thickness of the Alveolar Bone?

A

Gingival Biotype

  • thin gingiva = thin alveolar bone
  • thick gingiva = thick alveolar bone
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14
Q

What is the simplest way to determine Gingival Biotype?

A

Metal Perio probe in the Sulcus

*if thin, probe visible through gingiva

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15
Q

T/F

Thin biotype is more likely to recede, and is correlated to a highly scalloped gingiva

A

True

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16
Q

What are the 2 ways to treat a Violation of BioWidth?

A

Orthodontic Extrusion

Crown Lengthening

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17
Q

When a tooth is extruded via orthodontics to move the margin out of the the BioWidth, what is often indicated?

A

New Restoration

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18
Q

What is the advantage to Crown Lengthening procedure as opposed to letting the bone loss resolve on its own?

A

Healing process of Crown Lengthening very predictable

*may lose more bone than you want if you let it resolve on its own

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19
Q

Crown lengthening is a ____ method

A

Subtractive

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20
Q

T/F
The re-establishment of health in a crown lengthening is predictable

Not treating BioWidth invasion may lead to unpredictable bone loss

A

True

True

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21
Q

Average distance from the Bone to the height of the FGG? (not interproximal)

Height from bone to soft tissue Scallop? (interproximal)

A

3 mm

4.5 mm

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22
Q

Papillary height is established by what 3 things?

A

Level of bone

Biological width

Form of the Gingival Embrasure

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23
Q

T/F

Changes in the form of an embrasure can impact the height and form of the papilla

A

True

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24
Q

The tip of the papilla behaves differently than the FGG on what aspect of the tooth?

A

Facial

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25
Q

The FGG averages 3 mm above the facial alveolar bone, but the tip of the papilla averages _____ above the interproximal bone

A

4.5 - 5 mm

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26
Q

If the papilla is further away from the alveolar bone on the facial interproximal side but but has the same BioWidth as the rest of the surface, what must be deeper?

A

Sulcus

*1 - 1.5 mm deeper

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27
Q

If the measurement is ___ to ____ mm, there is a full papilla

A

3 - 5

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28
Q

Who studied the relationship between the papilla and interproximal contact to the underlying bone to establish papillary height above bone?

A

Tarnow et al

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29
Q

When the interproximal contacts are _____ mm or less (to the alveolar bone), papilla always fill the space

A

5 mm

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30
Q

If the interproximal contact point is 6 mm above the alveolar bone, ____ % of the time the papilla fills the space

A

56%

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31
Q

If the interproximal contact point is 7 mm above the alveolar bone ______% of the time the papilla will fill the space

A

37%

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32
Q

T/F

On average females have a higher smile line

A

True

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33
Q

Maxillary incisal edge display at rest does what with age

Mandibular?

A

Decreases

Increases

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34
Q

What sex has a greater incisal edge display at rest?

A

Females

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35
Q

What do people notice about midline shift and cant?

A

Midline shift - no one notices

Cant - everyone notices

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36
Q

T/F

Cant isn’t as important as dental midline

A

False

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37
Q

How far does a midline shift have to deviate before Orthodontists notice?

Everyone notices a ___mm incisor crown angulation

A

4 mm

2 mm

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38
Q

Anterior preparations have how much of an incisal reduction?

A

2 mm

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39
Q

Integrity is what kind of material?

PMMA?

A

Bis-acryl

Poly methyl methacrylate

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40
Q

PMMA goes through what kind of reaction?

steps?

A

Polymerization rxn

initiation, propagation, termination

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41
Q

Acrylics can be classified by their activation (initiation), which can be what 3 things?

A

Heat

Chemical

Light (400-500 wavelength) = camphroquinone

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42
Q

For PEMA (SNAP), what is the Initiator found in the Powder?

What is the Activator found in the Liquid?

A

Benzoyl Peroxide

Tertiary amine

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43
Q

PEMA =

PMMA =

Which is SNAP?

A

Poly ethyl methacrylate (SNAP)

Poly methyl methacrylate (Jet)

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44
Q

PEMA vs PMMA - which one heats up more?

What is it called?

A

PMMA - may traumatize pulp

Jet acrylic

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45
Q

PEMA and PMMA are both chemically activated

A

True

*by a Tertiary Amine

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46
Q

What is the main advantage to working with PEMA (SNAP) over PMMA (Jet)?

A

Low curing heat

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47
Q

What is Triad activated by?

What is the Initiator?

A

Light (400-500 nm)

Camphorquinone

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48
Q

T/F

Triad is activated by heat

A

False

*Light 400-500 nm

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49
Q

Polyvinyl siloxane can go through a _____ rxn whose byproduct is ______

A

Condensation

Ethanol

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50
Q

PVS that goes through a condensation rxn (2 types of putty squished together) has what advantage over condensation silicone impression materials?

A

Less polymerization shrinkage

*highly filled

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51
Q

3 reasons for a beveled shoulder:

A

bend or burnish metal margin to tooth

minimize marginal discrepancy if crown doesn’t seat completely

Protect chipping (by removing unsupported enamel)

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52
Q

A Heavy Chamfer is also referred to as a ________ and is achieved with the ________ bur

A

Deep Chamfer

856.025

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53
Q

T/F

Sharp corners are more prone to impression voids

A

True

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54
Q

For adequate resistance form, how high should Anterior preps be?

Posterior?

A

3 mm axial wall height

4 mm

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55
Q

Teeth that have greater than ____ height to base ratio will have adequate resistance form

A

0.4

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56
Q

3 general esthetic considerations to keep in mind for All Ceramic restorations?

A

Pink framing

Shade

Translucency

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57
Q

When would metal show through a Metal-Ceramic restoration?

A

If prep too thin (so porcelain too thin)

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58
Q

T/F

A metal to porcelain (ceramic) crown is one of the Least conservative restorations available to the dental profession

A

True

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59
Q

A metal-porcelain crown will often look like what on the gingival border? (PFM)

What might prevent this?

A

Gray

New labial designs moving metal margin away from gingiva

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60
Q

3 indications for use of an all Ceramic restoration?

A

Single crown

High Esthetic demand

Metal allergy

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61
Q

T/F

Metal allergy includes those pts that can’t wear metal jewelry - must ask the pt before Tx planning

A

True

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62
Q

T/F

An all ceramic is basically an all glass restoration, and most people are high Esthetic demand pts

A

True

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63
Q

All ceramic restorations - 4 Patient Selection Criteria:

A

Optimal Esthetics required and ACHIEVABLE

ideal prep

favorable occlusion

compatible opposing dentition

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64
Q

6 important properties of Ceramic Materials:

A

Translucent

Chemically stable

Fluorescent

Biocompatible

High compression resistance

CTE (coefficient of thermal expansion) similar to natural tooth

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65
Q

Advantages to Ceramic Crowns: Excellent ______

Good peripheral blend of _____

Luting material not _____ in oral fluids

_______ margins

Soft tissue _______

A

esthetics

shade

soluble

Supra-gingival

compatibility

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66
Q

T/F

PFM is not translucent, whilst all ceramic is

A

True

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67
Q

With some dark teeth, what can be used to mask the dark dentin?

A

Zirconia

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68
Q

Ceramics have less irritation/inflammation at the margins compared to metals

A

True

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69
Q

T/F

All ceramics have enhanced esthetics b/c of no metal and improved light transmission

A

True

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70
Q

All ceramics are most beneficial for those teeth that have what colored dentin?

If dentin is dark, use what?

A

Normal

Zirconia

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71
Q

T/F

Facial tooth reduction isn’t as much using all ceramics (supra gingival)

A

True

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72
Q

T/F

ACC’s can be technique sensitive and there is a time consuming luting procedure

A

True

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73
Q

T/F

ACC’s can be brittle, fragile to occlusal adjustment, and have a lack of repair ability (if fracture, that’s it)

A

True

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74
Q

What might cause gingival irritation in an ACC?

Where would you not use an ACC?

A

rough margins - easy to do

molars - greater potential for fracture (Empress)

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75
Q

Contraindications for ACC’s include compromised teeth, bad habits, occlusal interferences, difficulty isolating, and if the margin is where?

A

Sub-gingival

*not possible especially if restoring using resin cement

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76
Q

What are 2 Major problems with ACC’s?

A

Brittle - a flaw will propagate along crack

Abrasive to opposing tooth

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77
Q

The higher the _____ concentration of an ACC, the more wear there is

A

Leucite

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78
Q

2 General ways to classify dental ceramics:

A

Composition

Lab processing

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79
Q

3 Types of ceramics (by composition):

A

Glass - looks great

Glass infiltrated (particle filled glass) - stronger

Polycrystaline - almost like metal

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80
Q

Glass ceramics are highly esthetic and best at mimicking what?

A

Optical properties of enamel/dentin

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81
Q

An example of a glass ceramic:

A

Feldspathic porcelain

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82
Q

Glass infiltrated ceramics (particle-filled glass) have what in them that improves their mechanical properties?

A

Filler particles

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83
Q

3 examples of the filler material in Glass infiltrated ceramics?

A

alumina

magnesia-alumina

alumina-zirconia

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84
Q

Polycrystalline materials have increased what?

Reduced what?

and No what?

A

strength

translucency

glassy components

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85
Q

What is the only way to process Polycrystalline ceramics into shapes?

A

computer-assisted machining

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86
Q

2 Examples of Polycrystalline ceramics?

A

Cercon Base

DC-Zirkon

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87
Q

Where are Glassy materials most often used? (weak, translucent)

Particle-filled glass?

Polycrystalline?

A

Anteriors

Anteriors/posteriors

Posteriors (some anteriors)

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88
Q

3 Glassy materials:

3 Particle filled glasses:

4 Polycrystalline:

A

feldspathic, VMK95, Initial

In-Ceram, Empress I/II, E max

Lava, Everest, Cercon, Procera

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89
Q

Classification of ceramics according to Laboratory processing (4 ways)

A

Sintered conventional powder-slurry

Castable/Pressable

Machinable

Infiltrated

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90
Q

What is the traditional method of fabricating an ACC?

A

Powder condensation

*moist brush, compact, vacuum firing

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91
Q

Ceramics made by what technique are translucent and esthetic, used mostly for veneering layers

A

Powder condensation

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92
Q

What ceramic is used with an Aluminous Core w/ a platinum matrix heated to drive off dissolved gases and a core porcelain build up?

A

Conventional Powder-Slurry

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93
Q

Powder-Liquid ceramics have great translucency and can be as thin as _____ mm

A

0.2 mm

94
Q

T/F

Dual cures can change colors, so if you want a highly translucent product use a light cure

A

True

*zirconia = dual cure

95
Q

When was the Porcelain Jacket Crown developed?

Aluminous Porcelain Jacket Crown?

A

1800’s

1965 - aluminous oxide strengthened

96
Q

What is stronger than the Powder Liquid ceramic?

2 examples:

A

Pressed ceramic

IPS Empress, IPS Empress 2

97
Q

Y-TZP is an example of what?

A

Polycrystalline ceramic matl

*YTTRIUM Tetragonal Zirconia Polycrystals

98
Q

2 All ceramic products that can be used in Press Technology or CAD/CAM technology?

A

IPS Empress

IPS E max

99
Q

Leucite can be a filler for what?

Lithium disilicate, alumina spinel, and zirconia can be a filler for what?

A

High glass content

Low glass content

100
Q

No glass content (polycrystalline) can be what 2 matls?

A

alumina

zirconia

101
Q

What IPS matl is Leucite Glass Ceramic, low flexural strength?

A

IPS Empress Esthetic

*looks really good - highly translucent

102
Q

What is the Improvement over IPS Empress Esthetic with increases strength, higher flexural strength, and in monochromatic?

A

Empress 2 (pressed ceramic)

103
Q

IPS Empress Esthetic is what matl?

Empress 2 is what matl?

IPS E max?

A

Leucite glass

disilicate glass

Lithium-disilicate

104
Q

IPS E max press (Ivoclar Vivadent) was introduced in 05 and uses what type of cement?

A

Resin cement

105
Q

IPS E max has better physical properties and improved esthetics

A

True

106
Q

What high strength ceramic with a superior marginal fit has 2 fabrication methods and must be bonded?

A

Pressed

107
Q

Under or Over etching will do what to bond strength?

A

Decrease

108
Q

T/F

HF acid has better bonding properties than phosphoric

A

True

109
Q

What creates a bond between the HF etched teeth and an ACC?

A

Monobond-S

110
Q

With IPS Empress, when should you adjust occlusion?

A

After bonding

111
Q

IPS Empress is very esthetic and translucent and must be ______ to the tooth

However, it is relatively ______ and ______

*use for esthetic restoration

A

bonded

weak, expensive

112
Q

Lithium disilicate, titanium, zirconium, alumina, inflitrated Al/Zr, glass ceramics, composite, and castable plastic are used for what?

A

CAD/CAM matls

113
Q

The Alumina CAD/CAM matl is known as what?

A

Procera

114
Q

T/F

Procera crowns are digitized and emailed to Sweden or NJ

A

True

115
Q

What type of cement is used for Zirconia or Crystalline crowns?

A

Glassionomer

*no need for translucency

116
Q

What type of cement is used if you need translucency?

A

Resin (acid etch then bond)

*more difficult to use

117
Q

Any substructure =

A

coping

118
Q

What is the strongest laminate w/ great esthetics on the market?

(must be bonded - translucent - resin)

A

Procera Laminate

119
Q

Procera AllCeram system using glass free high strength ceramic core, used ant/post, CAD/CAM

A

Densely sintered high-purity Aluminum Oxide

120
Q

Aluminum Oxide sinters at _____degrees C

___% shrinkage upon sintering

A

1650

20%

***remember, Aluminum Oxide = Procera

121
Q

In the Procera system why is the die enlarged?

A

Compensates for sintering shrinkage

122
Q

Review: Glass powder liquid

Pressor matls (2):

CAD/CAM =

A

Empress, Emax

CAD/CAM

123
Q

What is the strongest matl (but not very esthetic)?

A

Zirconia system

124
Q

What type of cement do you use with Zirconia?

A

Conventional cement

125
Q

T/F

Removing Zirconia is easy

A

False

*very strong

126
Q

How is Zirconia cured?

A

Dual

*as opposed to light

127
Q

What product cleans after try-in of pretreated restoration?

What is the universal Restorative Primer? Applied for _____ secs then air dried

Next step?

***then?

A

Ivoclean

Monobond Plus, 60 seconds

Cement into restoration (dual cure)

***then seat, clean up, and Final Cure 20 secs/side

128
Q

IPS Empress, when adjust Occlusion?

Zirconia, when adjust Occlusion?

A

After bonding

Before bonding (high strength means cracks won’t go further)

129
Q

Glass Ceramics used in Anteriors for forces of ____ N

Alumina used on Premolars for forces of _____ N

Metal ceramics, zirconia, and gold (3M) are used in the Molars for forces of ____ N

A

150

300

400-800

130
Q

7 ACC matls from least to highest strength

A

Feldspathic porcelain

IPS Empress

IPS E max

In-ceram Alumina

In-ceram Zirconia

Alumina (Procera)

Zirconia (Cercon, LAVA)

131
Q

Incisal reduction for ACC:

The rest:

A

1.5 mm

1 - 1.2mm axial, 1.0 mm marginal

132
Q

2 systems to describe color:

A

Munsell (hue, chroma, value)

CIELAB

133
Q

Visible light spectrum:

A

380-750 nm (violet - red)

134
Q

Northern-exposure sunlight in the middle of the day that is slightly overcast.

A

Standard daylight

or northern daylight

135
Q

The reproducing capacity of artificial light to mimic natural daylight is measured by what 3 things?

A

color temperature

spectral reflectance curves

CRI- color rendering index

136
Q

The CRI is on a scale of 0-100 and indicates what?

A

color rendering of artificial light source

compared to standard Northern Daylight

137
Q

Incandescent lights emit higher concentrations of _____ light waves and has what CRI?

Fluorescent lights emit higher concentrations of _____ waves, has what CRI?

A

Yellow, low CRI

Blue, 50-80 CRI

138
Q

T/F

Incandescent and Fluorescent lights are suitable for shad matching

A

False

139
Q

What type of artificial light provides the best color matching?

Can these be used alone?

A

Color corrected fluorescent lamps w/ CRI over 90

Should use multiple sources

140
Q

What is the phenomenon when objects match color under one light source but not another?

A

Metamerism

141
Q

Dental offices should use color corrected lights and others for shade matching

A

True

142
Q

What 2 types of lighting are commonly used in the home and office and should be used to match shade (along with color corrected source)?

A

Incandescent

cool white fluorescent

143
Q

T/F

Shade match with the dental operating light

A

False

*only use ambient lighting

144
Q

T/F

A CRI of around 90 should be used to shade match

A

True

145
Q

What 3 factors determine color?

A

Hue

Chroma

Value

146
Q

3 primary subtractive colors

A

Blue

Red

Yellow

147
Q

What are the primary Additive Colors?

A

Red

Blue

Green

148
Q

Hue:

Chroma:

Value:

A

color (determined by wavelength)

color intensity (saturation)

light from dark (black and white grayscale)

149
Q

What is the most important factor in color?

A

Value

150
Q

Value is measured on a scale from _______

A

0 - 10

151
Q

What is a common color matching mistake in metal-ceramic prosth?

A

Restoration too high in Value

152
Q

T/F

Objects of different chroma/hue can have the same value

A

True

153
Q

CIELAB is better than Munsell and distinguishes color space by what 3 coordinates?

A

L

a

b

154
Q

In CIELAB, L =

a =

b =

A

lightness

red-purple/blue-green axis

yellow/purple-blue axis

155
Q

L, a, and b correspond to Munsell’s Hue and Chroma

A

False

156
Q

What in the eye interprets brightness?

What interprets color?

A

Rods (no color)

cones (only active under high lighting conditions)

157
Q

Rods are used for _____ vision

Cones are used for ______ vision

A

Scotopic

Photopic

158
Q

Rods have highest concentration where?

Cones?

A

peripheral retina

central retina

*remember, rods for brightness, cones for color

159
Q

Because color vision decreases rapidly, what should you look at between shade matching to restore color vision?

A

Pale blue or Gray surface

160
Q

When should the color be matched during an appointment?

A

Beginning

*tooth still hydrated - take off lipstick, try to have neutral background colors

161
Q

What is the best background to use for color matching?

A

N7 - N9 gray

*high value pastels also recommended

162
Q

The portion of the ceiling not occupied by lighting should be what value?

Large vertical surfaces?

A

9 or more

8 or more

*also, avoid high gloss

163
Q

Color blindness affects what % males?

Females?

A

8%

0.5%

164
Q

3 types of color blindness:

A

Achromatism - no hue

Dichromatism - 2 primary hues

Anomalous Trichromatism - all 3 hues, but retinal cones affect one primary pigment

165
Q

How long should you wait after bleaching to match color for a crown?

A

10 days

166
Q

3 types of commercial shade guides:

A

Vita classic

Vitapan 3D master

Extended Range Shade Guides

167
Q

What does A3 mean in the Vita Classic shade guide?

A

A - red-yellow

3 - chroma

168
Q

Vita Classic shade guide colors A:

B

C

D

A

red-yellow

yellow

grey

red-yellow-gray

169
Q

Vita Classic shade guide sequence for shade match (4 steps):

A

Hue (A, B, C, D)

Chroma

Value

Final check, revision

170
Q

How is value best determined?

A

squinting @ arms length

*increases rod sensitivity

171
Q

Would it be better to err on high value or low?

A

High

*low can’t be stained up in value

172
Q

Trying to increase value through staining will increase what?

Decrease what?

A

opacity

light transmission

173
Q

What shade guide starts with the Value?

A

Vitapan 3D master

174
Q

4 steps with Vitapan 3D master?

A

Value

Chroma

Hue

Final check/revision

175
Q

T/F

Extended range shade guides will cover bleached, dentin, and custom shades

A

True

176
Q

What 2 materials, when preparing for an ACC, would need a Stump Guide?

(match dentin)

A

Feldspathic porcelain

IPS Empress

177
Q

T/F

Stains increase surface reflections and prevent light from being transmitted through porcelain

A

True

178
Q

When a tooth is divided into 3 regions w/ 9 segments:

A

Shad mapping

179
Q

3 types of color measuring instruments:

A

Spectrophotometers

Spectroradiometers

Colorimeters

180
Q

A standardized image capture environment for shade matching using a full spectrum 7 band LED light

A

Crystaleye

181
Q

What is the default sequence at ASDOH for preparation of the tooth for a crown?

A

build up first

preparation

182
Q

A crown prep followed by a build up has what disadvantage?

A

temporize is difficult if non-restorable

183
Q

Amalgam, composite, and Glassionomer can all be used to build up a crown

A

True

184
Q

What is the dual cure composite material for crown build up?

A

Paracore

185
Q

Tooth in tooth relationship

A

MIP - max. Intercuspal position

186
Q

CR (centric relation) definition:

A

Condyles in most Anterior/Superior

187
Q

90% of people in MIP…

A

Are not in CR

188
Q

MIP = CR

A

10%

189
Q

MIP:

CR:

Centric Occlusion:

A

Max intercuspal position

Centric Relation (condylar)

Where the teeth touch first

190
Q

When would you restore the arch so MIP = CR

A

Teeth ground down

Endentulous

Full arch/mouth rehab

191
Q

If MIP and CR differ, there is a ______ to _______ slide

A

Centric Occlusion (where teeth meet first)

MIP

192
Q

If MIP and CR differ greatly, the resulting CO to MIP slide can result in what?

A

Parafunction

193
Q

The complete intercuspation of opposing teeth INDEPENDENT of condylar position

A

MIP

*he writes it as ‘maximum intercuspation position’

194
Q

Centric Relation is independent of what?

A

MIP and tooth contact

195
Q

The maxillomandibular relationship, condyles most Anterior and Superior, articulating with the thinnest avascular portion of the disk

A

Centric Relation

196
Q

In Centric Relation, the condyles articulate with what?

They are in what position against the articular eminence?

A

Thinnest avascular portion of disc

most Anterior and Superior position

197
Q

T/F

Centric Relation depends on tooth contact

A

False

198
Q

What type of movement is allowed when in Centric Relation?

A

Rotational

*any translation will get you out of CR

199
Q

CR, aka…

A

Terminal hinge axis

200
Q

Measured between the incisal edges, how far can CR rotate before translation occurs?

A

20-25 mm

201
Q

After 20-25 mm of CR rotation (measured incisally), what ligament tightens?

What direction do the condyles translate?

A

TemporoMandibular Ligament

Anterior and Inferior

202
Q

The occlusion of opposing teeth when the mandible is in Centric Relation:

A

Centric Occlusion

203
Q

Centric Occlusion is normally found where?

A

Posterior teeth

204
Q

A slide from CR to MIP is present in ____% of the population.

Average distance of slide:

A

90%

1 - 1.25 mm

205
Q

If the occlusion is stable, prosthetics are mounted in relation to what?

A

MIP

*existing occlusal scheme - most fall into this category

206
Q

If you want to perform an occlusal equilibration how should you mount the case?

A

Centric Relation

207
Q

A theory is that Interferences between what creates neuromuscular disharmony, resulting in parafunctional activity?

A

CO and MIP

208
Q

Unrestricted movement between CO and MIP is considered ideal when?

A

If there’s no change in Vertical Dimension

209
Q

T/F

The majority of cases can be restored to the pt’s MIP

A

True

210
Q

What are 2 common reasons to mount a case in CR?

A

No MIP - endendulous, full arch prep

CR to MIP slide interference

211
Q

Prep paramaters in CEREC are determined by what?

2 things

A

Material properties

Manufacturing process

212
Q

CEREC prep minimum shoulder thickness:

min. axial wall:
min. thickness under fissure:
min. thickness under cusp (ant/post):

A
  1. 0 mm
  2. 5 mm
  3. 5 - 2.0 mm
  4. 5 (anterior) 2.0 (posterior)
213
Q

3 aspects important to evaluate when acquiring an image:

A

distinct separation from adjacent teeth

all margins clearly visible

even amount of shadowing on adjacent teeth

214
Q

What are 2 ways to fix CEREC crowns to teeth?

each has 2 names

A

Cementation (luting)

Bonding (resin)

215
Q

What are the pros/cons to Luting a CEREC crown?

cementation

A

Cleans easily, no anesthesia, fast

Doesn’t increase restoration strength, dependent on surface area, can’t use w/ all matls

216
Q

Pros/Cons of Bonding (resin):

A

Strong w/ enamel, strengthens matl, good esthetics, don’t need retention features in prep

Isolation needed, not predictable, needs anesthesia, difficult clean up, technique/time

217
Q

When placing a crown clean the tooth with what?

Next 5 steps:

*last step allowed to react for how long?

A

Proxyt fluoride-free paste

try on

Etch (5% hydrofluoric acid)

rinse

dry

Monobond Plus *60 secs

218
Q

For Luting (cementation) use what conditioner?

Rins with water then dry (what is important here?)

Coat inside restoration, seat - what’s the working time?

Remove excess cement w/ scaler when?

Finishing can be started how long after seating?

A

GC Fuji Plus conditioner

don’t dessicate

2 min 15 secs

rubbery

4 min 30 secs

219
Q

What Resin Cement Bonding do we use?

A

Maxcem Elite

220
Q

Maxcem Elite - should do what after seating?

A

light cure 2-3 secs to achieve gel state

221
Q

After light curing Maxcem Elite for 2-3 secs to achieve gel state and after excess cement has been cleaned off, light cure all surfaces for how long?

For metal based/opaque restorations, let set for how long after seating

A

10 seconds

4 minutes

222
Q

What duplicates the anterior guidance of a patient?

*thereby reproducing excursive movements

A

Custom Incisal Guide Table

223
Q

When would a custom incisal guide table be indicated?

A

When pt’s existing anterior guidance is acceptable

224
Q

If the pt’s existing anterior guidance is UNacceptable, what 5 steps should be taken?

A

Diagnostic wax up

Provisional restorations (adjust intraorally)

Impression

Cast

Mount on Articulator

225
Q

When does a Custom Incisal Guide Table need to be used?

A

If one/more guiding teeth are prepared

*and want to preserve guidance

226
Q

What matl is used for a Custom Incisal Guide Table?

Setting time?

A

DuraLay - chemically activated PMMA

5 minutes

227
Q

A retention groove effectively does what?

A

Increases H/B ratio

228
Q

T/F

A CEREC prep should have smooth flowing transitions and a sharp cavo surface

A

True

229
Q

How will CEREC mill if there is a sharp jump in the margin?

A

Under mill - won’t seat

230
Q

T/F

High noble metals are more Castable

A

True

231
Q

Term for how tight a crown fits onto a preparation:

less rotational movement

A

Adaptation

232
Q

What 2 types of crowns have a better adaptation than a Milled Crown?

A

Pressed

Casted

Tim's Cards (140 decks)

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