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Fixed Prosth Final > 10. Framework and Pontic Design > Flashcards

10. Framework and Pontic Design Flashcards

1
Q

• Framework
– Any metal or combination
of metals or ceramic material which provide ____ to a dental prosthesis

A

rigidity

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2
Q

Framework Design

• Main objective
– Support a relatively ____ thickness of ____

A

even

porcelain

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3
Q

Framework Design
• A properly designed framework can ONLY be achieved by waxing the restoration to ____ and then cutting back a ____ amount for the veneer

A

complete anatomic contour

consistent

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4
Q 
Framework Design
• Waxing to anatomic contour allows:
– Even \_\_\_\_ of porcelain
– Proper \_\_\_\_ interfaces
– Good \_\_\_\_ design
– Optimally placed \_\_\_\_ contacts
A

thickness
porcelain-metal
connector
occlusal

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5
Q

Framework Design

• Once completed, the area to be veneered can be demarcated and an even ____ of wax removed

A

thickness

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6
Q

Framework Design
• To avoid fracture, the thickness of the ceramic veneer must not exceed ____ mm

Minimum porcelain thickness of ____ mm is needed for esthetics

Porcelain fracture on implant prosthesis

A

2

1

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7
Q

Framework Design

• At the porcelain-metal interface, the ceramic material should be at least ____mm thick

A

0.5

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8
Q

Framework Design
• The ____ of the ceramic- metal interface varies, depending on the ____ chosen to contact adjacent and opposing teeth

A

location

material

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9
Q

Framework Design
• Occlusalanalysis
– Centric stops can be located in ____ or ____
• Must be ____mm away from junction
– to prevent porcelain fracture from deformation of the metal
• Minimize ____ contacts over porcelain-metal interface

A

porcelain
metal
1.5
sliding

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10
Q 
Framework Design
• Opposing restorations must be carefully planned so that contacting surfaces are of the same \_\_\_\_
– \_\_\_\_ opposing metal 
– \_\_\_\_ opposing
porcelain
A

material
metal
porcelain

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11
Q

Framework Design
• Existing ____ in opposing arch can influence framework design
– A porcelain restoration cannot oppose a cast ____ restoration due to abrasion of gold by porcelain
• this may be an ____ problem depending on the location of the restoration intraorally

A

restorations
gold
esthetic

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12
Q

Framework Design
• Restorations with porcelain occlusal surfaces must be carefully planned
– Wear of opposing enamel
• ____ more abrasive than enamel
– Especially problem if not ____ or polished
– ____ strength than metal occlusal surfaces
– More difficult to obtain correct occlusal form
in ____ than metal

A

porcelain
glazed
lower
porcelain

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13
Q

Framework Design
Anterior Teeth

Different framework designs depend on ____ design

A

crown

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14
Q 
Framework Design
Connectors
     • Connector
– The portion of a fixed dental
prosthesis that \_\_\_\_ the retainer(s) and pontic(s)
A

unites

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15
Q

Framework Design

  • If FDP, connectors must have proper configuration and location
  • Restoration must conform to the normal ____ of the tooth that is being replaced
A

anatomic configuration

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16
Q

Framework Design
Connectors
• Size, shape, and position of connectors all influence ____ success
• Connectors must be sufficiently large
– Prevent ____
– Prevent ____ during function
not too large -> interfere with ____ control -> periodontal problems

• Need correct shaping to avoid esthetic problem
– Should occupy normal anatomic interproximal contact
areas
• Most manufacturers recommend ____mm vertical height

A 
prosthesis
distortion
fracture
plaque
3-4
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17
Q 
Framework Design
Connectors
     • Optimal connectors are:
– \_\_\_\_ to clean
– \_\_\_\_
– \_\_\_\_ pleasing
A

easy
strong
esthetically

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18
Q

Framework Design

____ is used to aid in cutback of wax pattern

A

silicone putty matrix

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19
Q

Framework Design
Summary
• Framework design must be based on understanding of fundamental material properties
• Restorations should be waxed to ____ and cut back
• ____ size, shape, and position influence the success of a FDP

A

full contour

connector

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20
Q

• Pontic
– Artificial tooth of a partial FDP (fixed dental prosthesis)
• Restores function and appearance
• Must be ____ with continued oral health and comfort
• Frequently ____ during treatment planning

A

compatible

overlooked

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21
Q 
• Proper preparation
– Analysis of dimensions of
  edentulous areas
• \_\_\_\_ width
• Occlusocervical
distance
• \_\_\_\_ dimension
• Location of residual ridge
• Opposing \_\_\_\_
– Form and shape of gingival
surface
• Prevent \_\_\_\_
A

MD
BL
occlusion
irritation

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22
Q

Pontic design
Considerations

BIOLOGIC
____ tissue surface
Access to abutment teeth
No ____ on ridge

MECHANICAL
____ (resist deformation)
Strong connectors (prevent fracture)
____- ceramic framework (to resist porcelain fracture)

ESTHETIC
Shaped to look like tooth replacing
Appears to 􏰆____􏰇 out of edentulous ridge
Sufficient space for porcelain

A 
cleansable
pressure
rigid
metal
grow
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23
Q 
Pontic Design
Pontic Space
• When Tx planning, \_\_\_\_ and waxing procedures may help determine optimal pontic design
– Consider \_\_\_\_ repositioning
– \_\_\_\_ pontics often trap food
• Difficult to clean
– May need to increase proximal contours
A

diagnostic
orthodontic
undersized

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24
Q

Pontic Design
Residual Ridge Contour

• Ideally shaped ridge
– Smooth, regular surface of attached gingiva
• Facilitates maintenance of ____-free environment
– Height and width should allow placement of pontic which appears to ____ from ridge
• Mimic appearance of adjacent teeth
– Adequate facial height to sustain appearance of
interdental papilla

A

plaque

emerge

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25
Q 
Pontic Design
Residual Ridge Contour
• Loss of residual ridge
– may lead to unesthetic \_\_\_\_ gingival embrasures
• 􏰆\_\_\_\_ triangles􏰇
– Food \_\_\_\_
– Saliva \_\_\_\_
A

open
black
impaction
percolation

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26
Q

Pontic Design
Residual Ridge Contour

Class 0 defect
No \_\_\_\_
Class I defect
Faciolingual loss of tissue \_\_\_\_ with normal ridge \_\_\_\_
Class II defect
Loss of ridge \_\_\_\_ with normal ridge \_\_\_\_
Class III defect
\_\_\_\_ of loss in both dimensions
A 
defect
width
height
height
width
combination
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27
Q

Due to esthetic problems from Class II and III defects, ____ surgery to augment ridges should be considered

A

preprosthetic

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28
Q

Pontic Classification

• No Mucosal Contact
– ____ (hygienic)

• Mucosal contact
– \_\_\_\_
– Modified ridge lap
– \_\_\_\_
– ovate
–  modified \_\_\_\_

Based on shape of ____side of pontic

A 
sanitary
ridge lap
conical
ovate
gingival
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29
Q

Pontic Selection
•Primarily depends on ____ and oral hygiene

• Anterior region
– ____ concerns
• Well adapt to tissue to appear emerging from gingiva

• Posterior region
– Possibly less esthetic, but better ____

A

esthetics
esthetic
oral hygiene

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30
Q

Pontic Selection:
Sanitary or Hygienic Pontic

• Allows easy cleaning because tissue surface is clear of ____
• May ____ food
• Least ____
– Limited to ____ mandible

A

ridge
entrap
esthetic
posterior

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31
Q

Pontic Selection:
Saddle or Ridge Lap Pontic

• ____ surface that overlaps residual ridge bucco-lingually
– Simulating ____ and emergence profile
• AVOID because concave surface unable to ____
– Results in tissue ____

A

concave
contours
clean
inflammation

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32
Q 
Pontic Selection:
Modified Ridge Lap Pontic
• Combines best featuresof hygienic and saddle pontic designs
– \_\_\_\_
– Easy \_\_\_\_
• Overlaps \_\_\_\_ on facial
– For proper emergence profile
• Clears ridge on lingual – Optimal \_\_\_\_ control
A

esthetics
cleaning
residual ridge
plaque

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33
Q

Pontic Selection:
Modified Ridge Lap Pontic

• Should be as ____ as possible for hygiene
• Need ____ adaptation for esthetics
– Tissue contact on facial
• Most ____ pontic form used in areas of mouth visible during function

A

convex
facial
common

34
Q

Pontic Selection:
Conical Pontic

• Also called: \_\_\_\_-shaped, bullet-shaped, heart-shaped
• Easy to clean
• One contact point in \_\_\_\_
of ridge (X)
• Not in \_\_\_\_ areas
– Facial and lingual contours depend on width of residual ridge
• Not for \_\_\_\_ residual ridges
– Poor \_\_\_\_ with point contact
A 
egg
center
esthetic
broad
emergence profile
35
Q

Pontic Selection:
Ovate Pontic
• Most ____ pleasing
• ____ tissue surface in soft tissue depression or hollow in ridge
– Tooth appears to emerge from gingiva
• Typically requires ____ surgical augmentation

A

esthetically
covex
soft tissue

36
Q

Pontic Selection:
Ovate Pontic

• Advantages – Esthetics
• Appears identical to natural emergence profile
– ____
– No food ____

• Disadvantages
– Meticulous \_\_\_\_
– Surgical management
– Increased \_\_\_\_
– Not possible with \_\_\_\_ defects

Ovate pontic design eliminates potential for ____ porcelain cervically

A 
strength
impaction
oral hygiene
cost
ridge
unsupported
37
Q

Soft tissue ____ indicates pressure

A

blanching

38
Q

Pontic Selection:
Modified Ovate Pontic

  • Ovate form with apex positioned more ____ on the residual ridge rather than ridge crest
  • Allows use when ____ is not sufficient for conventional ovate pontic
  • Cleansing is ____ of all pontic types
A

facially
horizontal ridge width
easiest

39
Q

TAKE A LOOK AT THE TABLE!

A

yay

40
Q

Pontic Selection

• Regardless of pontic design, patient must be instructed how to ____ gingival surface with floss

A

clean

41
Q

Pontic Design
Summary
• Select design to allow for easy ____ control
– essential for ____ term success
• Minimize tissue contact by maximizing
____
• Special consideration for easy maintenance with natural appearance and strength
• Must accurately convey design to dental technician

A

plaque
long term
convexity

42
Q

Introduction

• For the cast metal restoration, series of finishing procedures necessary to produce highly polished surfaces
– Limit ____ and plaque retention
• Facilitate maintenance of health and periodontal tissues

A

accumulation

43
Q 
Introduction • Different zones can aid in
developing sequence to finishing restoration
– Zone 1: \_\_\_\_ margin
– Zone 2: \_\_\_\_ surface
(intaglio)
– Zone 3: \_\_\_\_
– Zone 4: \_\_\_\_ contacts
– Zone 5: \_\_\_\_ surface
– Zone 6: \_\_\_\_ walls
– Zone 7: External \_\_\_\_
A 
internal
internal
sprue
proximal
occlusal
axial
margins
44
Q 
Zone 1: Internal Margin
• Defect in margin
– \_\_\_\_ crown 
– New \_\_\_\_
• Small nodules may be \_\_\_\_ if far from margin
– Ex. 1⁄4 round bur
A

remake
impression
removed

45
Q 
Zone 2: Internal Surface (intaglio)
• Intaglio=internal surface
• No contact between \_\_\_\_ and internal surface
– Need space for \_\_\_\_ agent
– Relieve any \_\_\_\_
• Remove any nodules
– Do not \_\_\_\_ die
A

die
luting
contacts
abrade

46
Q

Zone 2: Internal Surface
(intaglio)
• Marking agents facilitate identification of ____ between casting and die
– ____ soluble (paint on)
• ex.Liqua-Mark
– ____ based dyes • ex.AccuFilmIV
– ____ sprays
• ex. Occlude (spray)
• Do not indiscriminately remove material
– Results in excessive loss of retention and resistance form

A

interferences
water
solvent
powdered

47
Q

Zone 3: The Sprue
• Once casting fits on die, sprue is removed
– Reestablish proper ____ tooth structure and function
• Carborundum separating disk to cut through the sprue
– Leave small area in center and ____ to separate
• Refine with stones and sandpaper disks

A

coronal

twist

48
Q 
Zone 4: Proximal Contacts
• Adjust contact to be correct in mouth
– Or slightly too \_\_\_\_
• Special care to avoid
\_\_\_\_ contact
• Articulating paper between adjacent castings and/or adjacent teeth helpful
A

tight

overreducing

49
Q

Zone 4: Proximal Contacts
• Connectors
– Require special
attention
– Need to be highly ____
– Mesiodistally, properly finished connector has ____ configuration
– Rotary instruments (ex. rubber wheels) to finish

A

polished

parabolic

50
Q

Zone 5: Occlusal Surface
• Reestablish ____ contacts
– Intercuspation and excursions
• Utilize flame shaped finishing burs or diamonds
– Redevelop ____ of entire ridge or cusp
– Define grooves with finishing or small round bur

A

occlusal

anatomy

51
Q

Zone 5: Occlusal Surface
• Before adjustment, use thickness gauge on metal
– Minimum ____mm thick
• <1.0mm inadequate
• After contacts refined, do not excessively overpolish and remove contacts

A

1.0

52
Q

Zone 6: Axial Walls
• Axial walls should be smoothly contoured and highly polished
– Optimum plaque control
• Utilize abrasives to remove
surface defects
• Finish using progressively ____ abrasives
– Do NOT progress to finer grade too ____
• Polish with tripoli and rouge

A

finer

rapidly

53
Q 
Zone 7: External Margins
• Want highly polished margins without ledges or steps to unprepared tooth structure
• If access, can finish directly on \_\_\_\_
• If limited access, finish on \_\_\_\_
• Excessive finishing creates problems
– Do not compromise emergence profile
A

tooth

die

54
Q 
Review of Technique
Pre-clinical Exercise
• Abrasive disks, green stones and carborundum separating disks in straight handpiece
– Refine and smooth contours
– Coarser grit > finer grit
\_\_\_\_
\_\_\_\_
\_\_\_\_

• Leave final finishing of margins until ____
• Once contours and smoothness acceptable, ____ wheels and points used
• Final polishing (ragwheel, Robinson bristle brush) – Tripoli
– Rouge

A 
finishing bur
green stone
white stone
try-in
rubber
55
Q 
Introduction
   • Metal-ceramic restorations
  – Often, minimum of \_\_\_\_ evaluations (try- in)
• \_\_\_\_ evaluation
• Reevaluation following \_\_\_\_ addition
A

two
metal
porcelain

56
Q 
Introduction
• Metal evaluation
– Margin \_\_\_\_
– Stability
– \_\_\_\_
– Substructure design
• Assessment of cut- back area
– Avoid metal in \_\_\_\_ areas
A

integrity
occlusion
esthetic

57
Q

Introduction

• Solder transfer
– If ____
– For ____ units
– Tissue transfer

• ____ transfer

A

necessary
multiple
coping

58
Q 
Introduction
  • Bisque evaluation
– \_\_\_\_ material before vitrification (glazing)
– Reevaluate marginal integrity
– Proximal contours
– Stability
– Shade
– Texture
– Glaze
A

ceramic

59
Q

• For partialf ixed dental prosthesis
– Tissue ____ of pontic and location and shape of connectors need assessment
– Needs to be ____
• or tissue irritation

A

contact

passive

60
Q

Restoration almost always

requires ____ adjustment

A

chairside

61
Q 
Evaluation
  • Remove provisional restoration
– Hemostats or crown removing forceps
• Remove remaining \_\_\_\_ from tooth
• May clean tooth with \_\_\_\_ and water
A

cement

pumice

62
Q 
Evaluation Sequence
• (1)\_\_\_\_ contacts
• (2)Marginal \_\_\_\_
• (3)\_\_\_\_
• (4)\_\_\_\_
• (5)\_\_\_\_
• (6)\_\_\_\_
• (7)\_\_\_\_ or polishing
A 
proximal
integrity
stability
occlusion
contour
characterization
glazing
63
Q

(1)Proximal Contacts

• Evaluate first to allow seating
• Location, size, contact should resemble \_\_\_\_ teeth
• Unwaxed floss should 􏰆\_\_\_\_􏰇 through
– May use Shim stock
• Pt may assess tight
contact by 􏰆\_\_\_\_􏰇
• Deficient contact results in food \_\_\_\_
A

natural
snap
feel
impaction

64
Q 
(1)Proximal Contacts
• Excessive tightness
– Mark and adjust
carefully
– If both are tight, adjust \_\_\_\_ basis
– Leave slightly tight to polish
– Repolish metal and or porcelain contact
A

alternating

65
Q

(2)Marginal Integrity

• Marginal fit should be = on ____ and intraorally
• Different techniques to determine fit
– ____ soluble marking agent (ex. Liqua-Mark)
– ____
– ____ paste
• May also assess marginal fit

A

die
water
occlude
elastomeric

66
Q

(2)Marginal Integrity

• Assessment
– Sharp explorer
• Margins should be ____
• May eliminate minor discrepancies through
adjustments
– If inaccurate, re-make with new impression
– CONFIRM WITH ____! (usually ____)

• Finishing margins
– Same as cast metal
– Cannot finish poorly ____ casting to be acceptable!

A

undetectable
radiograph
BW
fitting

67
Q

(2)Marginal Integri

Small overhang can often be corrected by adjusting the ____

A small ledge may increase the risk of recurrent ____

An open margin requires a ____ casting

A

casting
decay
new

68
Q

(2) Marginal Integrity

____ needed to confirm seating of crown

____ radiograph offers a better assessment than a periapical radiograph

A

radiograph

BW

69
Q 
2)Marginal Integrity
• Deficient margin 
– All metal
• May \_\_\_\_ (?)
– Porcelain restorations
• Requires additional porcelain \_\_\_\_
– \_\_\_\_ bake
» Additional firing
– Glaze
» Lower \_\_\_\_ correction porcelain

____** due to excessive firings

**to change from glassy to a crystalline state and become ____ and ____

A 
solder
firing
bisque
fusing
devitrified
brittle
opaque
70
Q

(3) Stability

• Check for stability
• Should not rock or rotate when force applied
• Any instability will cause failure during function
– If nodule, remove – If ____, new
casting
• For partial FDP, check tissue contact of pontics

A

distortion

71
Q

(4) Occlusion

• Check after correct proximal contacts, crown well-seated and sealed margins
• Should have ideal tooth contacts on natural teeth and restoration
– Natural teeth AND restoration should occlude ____
• Verify with ____
• ____ to identify contacts

A

simultaneously
shim stock
articulating paper

72
Q

(4) Occlusion

  • If supraoocclusion
    – Adjust
    – Check with ____
    • If significant
    discrepancy, ____
    • If not inocclusion
    – ____ if cast metal
    – Additional porcelain ____
A

calipers
remount
re-make
firing

73
Q

(5) Contour

• Verify contour of gingival 1/3
– Excessive bulk \_\_\_\_ disease
• For anterior teeth
– Establish proper \_\_\_\_
and shape of incisal edge
• Mark \_\_\_\_ on restoration
– Adjust as needed
• \_\_\_\_ the teeth
• Evaluate at normal conversational distance
A

periodontal
position
line angles
moisten

74
Q

(6) Characterization

• Need to duplicate the surface detail of natural teeth (adjacent teeth)
• Generate textures of normal anatomic form
– ____ surfaces (no sharp grooves)
• Do NOT 􏰆____􏰇

A

curved

overcharacterize

75
Q

(7) Glazing

  • during glazing, surface layers of porcelain melt ____
  • surface stains may be applied during ____
    • A restoration that is not sufficiently glazed, will retain more ____ and be more liable to ____
    • After glazing, metal surfaces are ____
A 
slightly
glazing
plaque
fracture
polished
76
Q

(7) Glazing

White stain to mimic ____

Stain with increased ____ for proximal coloration

Stain is dried to ____ consistency in front of furnace muffle

A

hypocalcification
chroma
chalky

77
Q

(7)Polishing

  • an alternative to ____
    • Provides greater control of surface ____ and distribution than glazing
    • Laboratory studies show polished porcelain no more ____ than glazed
    • Unpolished porcelain much more ____ than polished or glazed
A

glazing
luster
abrasive
abrasive

78
Q

Polishing Lithium Disilicate
• ____ used to
finish and polish lithium disilicate

A

dialite LD

79
Q

Polishing Lithium Disilicate
• Intraoral and ____ burs are available
– ____ system

A

extraoral

2 step

80
Q

Evaluation, Characterization
and Glazing
Summary
• For metal-ceramic restorations and all ceramic restorations
– Proper contouring of ____ is crucial
– Proper shaping of gingival and incisal embrasures, along with contouring and characterization significantly improves esthetics
– Small corrections and subtle changes can be made with surface ____
– Certain all ceramic restorations may be ____ before final adjustment and occlusion

A

cervical 1/3
stains
luted

Fixed Prosth Final (15 decks)

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