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Operative Dentistry, Module II > 7. Onlay Procedure > Flashcards

7. Onlay Procedure Flashcards

1
Q

An onlay is:
vA restoration that restores the ____ surface of the tooth as well as one or more ____
vA restoration that restores the ____ and ____ surfaces of the crown of the tooth
vA restoration that involves one or both ____ surfaces

A 
occlusal
cusps
internal
external
proximal
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2
Q

An onlay is:
vConsidered an ____ and ____ restoration
vIt is an ____ procedure

A

intracoronal
extracoronal
indirect

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3
Q

Extracoronal Restorations and Occlusion:

vOcclusal forces transmitted through an onlay restoration, tend to hold the cusps together because the ____ have been incorporated into the restoration

A

cusps

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4
Q

Onlay Indications

v Indicated when the buccal or lingual isthmus outline is ____ the distance from the central groove toward the cusp tip

A

two-thirds

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5
Q

Onlay Indications
v Indicated when the buccal-lingual isthmus width is more than ____ the distance between the buccal and lingual cusp tips

A

half

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6
Q

Onlay Indications
v Necessary for adequate ____ form – to overlay a ____ cusp

or a ____ cusp

A

resistance
weakened
broken

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7
Q

Onlay Indications

v Can replace broken cusps when there still is remaining enamel supported by ____ on the buccal and/or lingual surfaces.

A

dentin

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8
Q

Onlay vs. Crown

v Can be a ____ alternative to a full coverage crown

A

conservative

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9
Q

Onlay Preparation vs. Crown Preparation
v A more ____ preparation than a crown preparation
v Onlay has ____ margins -
vless ____ to gingiva than full crown preparation

A

conservative
supragingival
irritating

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10
Q

Onlay Contraindications

Choose full coverage crown when:
v The onlay preparation final margin areas would be in areas of ____
v The remaining buccal and lingual tooth structure is without ____

A

decalcification

supporting dentin

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11
Q

Advantages
v Preserves ____ structure – less reduction than a crown
v Prevents the ____ that may lead to fracturing of fragile cusps
vMore precise ____ over contours and contacts
vImproved access and visibility
• Fabricated on a ____ outside the mouth

A

tooth
stresses
control
die

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12
Q 
Disadvantages of an Onlay
v Multiple \_\_\_\_
v \_\_\_\_ (interim) restoration 
v Laboratory \_\_\_\_
v \_\_\_\_ sensitive
A

appointments
provisional
cost
technique

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13
Q

Onlay Options
v ____
v ____

A

cast gold

porcelain

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14
Q

Porcelain Onlay
Porcelain onlay preparation maxillary first molar

Buccal view of completed onlay

A

YAY

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15
Q

Porcelain Onlay

Indications specific to Porcelain Onlays:
v Areas of ____ importance
v Areas of ____ defects or failing previous restorations
v ____ sized lesions

A

esthetic
large
moderate

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16
Q

Porcelain Onlay

Contraindications specific to Porcelain Onlays
v Areas of heavy ____ wear
v ____ history
v Lack of ____ enamel
v Inability to maintain a ____ field
v Deep ____ preparations
• Want gingival margins in ____ – best bond

A 
occlusal
bruxism
occlusal
dry
subgingival
enamel
17
Q

Specific Advantages of Porcelain Onlays
Ability to strengthen remaining tooth structure
v____ bonded
vReduced ____ vs large composite restoration

A

adhesively

polymerization shrinkage

18
Q

Specific Disadvantages of Porcelain Onlays
v ____ of porcelain onlays:
vCeramic can fracture without adequate ____ vCan fracture during ____ in or after cementation
vWears ____ dentition and restorations
• Particularly if ____ and unpolished

A 
brittleness
thickness
try
opposing
rough
19
Q

Porcelain Onlay Preparation

vTooth reduction varies between ____ and non functional cusps
vReduction will mimic ____ anatomy of the cusp being reduced
vAll areas should have a common ____
• All walls are ____

A

functional
original
path of draw
divergent

20
Q

Porcelain Onlay Preparation

1. Prepare an “overcut” MOD preparation 
\_\_\_\_ or tapered diamond bur
\_\_\_\_ mm isthmus buccolingually
\_\_\_\_ mm depth
\_\_\_\_ walls
2. Use tapered fissure bur remove \_\_\_\_
3. Internally \_\_\_\_ angles are important
A 
171
2-3
2
divergent
undercuts
rounded
21
Q

Porcelain Onlay Preparation

  1. Proximally, extend to just break ____
  2. Check all areas have common path of
    draw-____
  3. NO ____ - ____
    joint cavosurface
  4. NO ____ contacts in MIC directly on ____ areas
A 
contact
divergent
bevels
butt
occlusal
margin
22
Q

Porcelain Onlay Preparation

9. Occlusal reduction/cusp reduction:
v use tapered fissure bur (171)
v Follow \_\_\_\_ planes of occlusal anatomy 
v Reduction:
• Functional cusp: \_\_\_\_ mm
• Non functional cusp: \_\_\_\_ mm
A

geometric
2
1.5

23
Q

Porcelain Onlay Preparation
Occlusal reduction
v Follow original ____ contours

A

cuspal

24
Q

Porcelain Onlay Preparation

Check occlusal reduction in MIP and excursion
-Use a softened piece of ____ to check the bite: Make an imprint of the bite in MIP and measure the wax ____ with a periodontal probe where the cusp used to be

A

pink wax

thickness

25
Q

Porcelain Onlay Preparation
10. Occlusal shoulder - On the ____ surface of the cusp being covered
v Added with tapered fissure bur
v ____ mm wide axially
v Placed in the ____ third of the cusp O/G
v ____ joint – NO ____

A 
outer
1-1.5
middle
butt
bevels
26
Q

Porcelain Onlay Preparation

____ external and internal angles

____ mm axial reduction
____ joint shoulder margin

____ mm non functional (L) cusp occlusal reduction

A

rounded
1-1.5
butt
1.5

27
Q

Procedure for Porcelain Onlay

____ mm non functional cusp (L) shoulder reduction

Check with ____ mm hatchet width

____ mm proximal contact opening

Check with ____ mm hatchet thickness

A

1
small 1
0.75
small 1.0

28
Q

Procedure for Porcelain Onlay
____ mm non functional cusp (L) occlusal reduction
Check with ____ in MIP to measure occlusal reduction

A

1.5

pink wax

29
Q

Summary
v An excellent alternative to direct composite restorations
v More ____ than full-coverage restorations
v Very ____ sensitive
• Proper case selection
• Operator skill
• Attention to detail

A

conservative

technique

30
Q

Provisional Restoration
vAn ____ restoration cemented into the preparation until the final restoration is delivered
v“Temporary” – ____ more correct
vMade of ____ or composite materials

A

interim
provisional
acryclic

31
Q

Provisional Restoration
A Provisional should:
v____ the tooth
vmaintain the health of periodontium
vmaintain the ____ of the prepared tooth in the arch
vmaintain position of ____ and opposing teeth

A

protect
position
adjacent

32
Q 
Provisional Restoration
A Provisional should (continued):
vprovide \_\_\_\_, phonetic, and masticatory functions
vhave adequate \_\_\_\_ and retention 
vnot be \_\_\_\_
A

esthetic
strength
irritating

33
Q

Provisional Restoration Composite Resin Procedure

vBefore tooth preparation, roll hard body ____ putty into a hot dog shape and place it on the tooth being prepared to make an impression.
vCapture the tooth and both ____ teeth in the impression
v“____”

A

polyvinyl siloxane
adjacent
putty shell

34
Q

Provisional Restoration Composite Resin Procedure
vLubricate preparation with ____. Use a brush and coat the tooth well
vPlace composite provisional material into molded putty shell

A

vaseline

35
Q

Provisional Restoration Composite Resin Procedure

vSeat Putty shell fully onto preparation
vWait ____ minutes
-Remove putty shell from arch
-Refine Carefully trim away excess

A

1.5-2

36
Q

Provisional Restoration Composite Resin Procedure

vVERY carefully perform minor last adjustments on the prepared tooth
vDO NOT DAMAGE THE TOOTH OR THE PREPARATION

A

YAY

37
Q

Provisional Restoration Composite Resin Procedure

Final try in and margin check

Check and adjust occlusion

A

YAY

38
Q

Provisional Restoration Composite Resin Procedure

Provisional is cemented with a “temporary” ____ cement

A

non-eugenol

Operative Dentistry, Module II (7 decks)

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