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CSP3 YR5- Restorative > Post and Cores > Flashcards

Post and Cores Flashcards

1
Q

What things to check for when assessing whether a RCT’d tooth has been successful?

A

Lack of symptoms
No pain
Not TTP
No palpation pain
No swelling
Radiographic healing
Functional and aestehtic tooth

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2
Q

Describe radiographically a failed RCT?

A

Presence of a periradicular radiolucency, unchaned or a new increased rarefraction

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3
Q

When does a RCT’d tooth new re-reatment?

A

If the GP has been exposed in the mouht for some time
OR
if post-treatment disease has been diagnosed

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4
Q

What factors dictate whether a tooth has a good prosthodontic prognosis?

A

The quality and quantity of remaining tooth structure is the single most important factor

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5
Q

What to assess in the root filled tooth?

A

Remove all caries, restorations and assess the quatity distribution and quality of tooth substance remaining

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6
Q

What is the ferrule’s effect?

A

The remaining coronal tooth tissue offers retention, resistance and a substrate to bond to

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7
Q

What is the defintion of the ferrule?

A

A metal ring or cap intended to embrace the tooth structure cervically to achieve root strengthing and prevent shattering of the root
2mm H
1mm W (from post hole to margin)

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8
Q

What factors influence the ferrule?

A

A longer ferrule increases fracture resisatnce significantly
Also resists lateral focres from the posts and leverage from the crown in function
It increases retention and resistance of the restoration

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9
Q

Name the 5 requirements for a successful crown/crown prep?

A

Ferrule (dentine axial wall height) must be at least 2-3mm
The axial walls must be paralled
Restoration must encircle tooth
Margin is on solid tooth structure
Corwn and prep must not invade the biologic width

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10
Q

What are the clinical complications for missing 1 of the 5 requeirements of the prep?

A

Root Fracture
Coronal apical leakage
Reccurent caries
Dislodgement or loss of the core
Perio injury - LoA, recession, and bone loss - biologic width invasion

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11
Q

What are the 4 advantages for the Ferrule effect?

A

Provides anti-rotational features
Increases longevity of post and core
Failure of restoration tends to be retrievable
Increases the fracture resistance of the RCT’d teeth

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12
Q

Is GP antimicrobial?

A

No

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13
Q

How to remove sealer from pulp chamber?

A

Alcohol

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14
Q

How to seal the pulp chamber?

A

Vitrebond - RMGIC

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15
Q

When should we place the post?

A

Immediately after the prep

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16
Q

WHat are the advantages of placing the post immediateyl?

A

Familiarity with RCS and WL
Decreased risk of perfs or excessive GP removal
Does NOT disrupt the apical seal
Delayed post space prep does decrease chance of coronal leakage

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17
Q

How does length of post influence success of RCT’d tooth restoration?

A

More important than width
The longer the post, the better the retention
Siginificant increase in clinical success if longer than the crown height
Shorter posts have poor retention and transmit lateral forces to the remaining root structure compared to longer posts
Need for >4-5mm of GP apically

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18
Q

What is the ideal width of the post?

A

Adequate width important for post strength and resistance to fracture
Optimum is <1mm width at the tip
but consider root morphology - larger roots can perforate the tooth

Diameter of the post at its tip should be <1/3 of the diameter of the root at the corrsponding depth e.g. lower incisor .6 and upper incisor 1mm

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19
Q

What are the risks of a wider post?

A

Increased risk of root perf
Increased cervical stresses
Decreased impact resistance
Decreased resistance to root fracture

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20
Q

Explain how to remove the GP for a post?

A

Chemical - increased apical leakage
Thermal - can distub apical GP
Mechanical - most efficient

GG (Gates Glidden) do not causes the large increases in temperature

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21
Q

Hand or rotary removal of GP?

A

Hand less change of iatro and temo
Rotary greater change of iatro and temo - high torque and low speed

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22
Q

Explain the process to remove GP and prep the post hole mechanically?

A

Use non-end cutting bur GG
Cuts GPP preferentially than dentine walls

Then use peeso reamers/parapost reamers to finally comple the prep after GP removed (can lead to increases in temp)

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23
Q

What are the ideal properties for a luting cement?

A

Insoluble
Prevent microleakage
Adherere to radciaulr dentine - potentially reinforce root
withstand fatigiue froces well
Can risk generation microcrack can culminate in the failure of the restoration

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24
Q

Name 3 types of traditional luting cements?

A

ZPC - mechanical means no chemical
GIC - depends on resin content - can bond more to dentine
RMGIC - no indicated for posts due to hygroscopy

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25
Name the advantages and disadvantages of resin-based luting cements?
Potentially reinforce tooth Aid post retention Require pretreatment with etch and bond adhesives form hybrid layers allong the post space walls But bonding to radicular dentine may be affected by NaOCl which is strong oxidising agent Leaves oxygen rich layer on dentine - inhibits poly of resin Eugenol diffusing affect retention of bonded post
26
Explain how to use dual cure resin-based luting cements?
Difficult for moisture control Use self-etch prposed as an alternative, but hard to penetrate smear layer Dual cure adhesives developed to ensure better pilymer deeper in root Contain ternanry catalyst to ofset acid base reaction
27
Explain how to use self-adhesive resin-based luting cements?
Alternative to conventional resin-based luting cements React with hydroxyapatite Does NOT reuire pretreatment of root dentine Reduces techique sensitivty Also dual cure, and so need light adhesion similar to multisetp luting cememnt, not recommended for bonding to enmale without phosphoric etch Not clinically proven to work
28
Chemically active resins?
4-META Don't use impossible to remove post
29
Name the advantages of adhesive cementation?
Improved marginal adaptation Improved apical seal Increased post retention - even for short posts Relives stress in root canal Optimises fracture patterns for re-restoration
30
Name the disadvantages of adhesive cementation?
Difficult to access without magnification Remnats of acid and debris from prep Bondign areas decreased by GP remnants, smear or sealer Voids and gaps in cement interface
31
Name the 4 main aims for resotorative management of root filled teeth?
Presevre tooth structure Protect tooth structure Maintain seal in canal Allow for re-tretment
32
What is the function of a post?
Retain the core when the reamining tooth structure is considerably reduced Stress distribution to radicular dentine and alveolar bone No strengthening effect excepts for fibre posts
33
What infleunce the difficulty of a root filled tooth restoration?
Quantity and location of remaining tooth structure Location of access cavity Consider the quantity of remaining dentine - coronally, pulp chambers and RCs
34
Indications for a post?
Primary aim is retention for the core when little detine and little useful pulp chamber remain
35
How to choose a post?
Passive Parallel sided Roughened surface Easy to use
36
How long should the post be?
As long as the crown 2/3rd of the length of the too 50% of the root length surrounded by bond As long as possible
37
Name the 2 function of the post?
Core retention Stress distribution
38
Name 5 factors that determine the dimensions of the post?
Root length Root diameter - <1/3 diameter of root Extention of root filling - 5mm min to maintain apical seal Clinical crown height Alveolar bone levels
39
Give an example staging for a cast post and core?
Review RCT Post space prep Crown prep Review anti-rotation Coronal finishing
40
Temporary restorations for the cast post and core?
Indirect - imps + cast Direct - resin pattern
41
Comapre the indirect versus direct techniques for temproary restoration?
Indirect: - less surgery time - working imos - opposing cast - shaape of core technician determined Direct: - increased surgery time - direct pattern - no opposing acst - core shape by operator
42
Name the 3 tools for the parapost?
Temp post Imps post (smooth) Pattern post (serrated)
43
Describe the indirect technique for post creation?
Elastomeic impression (wash imps) + lab fabrication Using smooth imps post
44
Describe the direct technique for post creation?
Colours relate to parapost diameter Using serrated burn-out post + DuraLay
45
Describe the Nealon Incremental Technique
Lub canal with DuraLay - bead brush Force down canal to express trapped air Record intra-radicular anti-rotation feature Trim with turbine + diamon + waterspray
46
What to do before trying in post-retained core?
Inspect and remove any casting blebs
47
Name the potential problems for metal posts and cast etal cores?
Radicul;ar fracture Coronal leakage Retriveability
48
Name 3 types of fibre posts?
Carbon Glass Quartz
49
Explain the clinical technique for fibre post placement?
Evaluate pre-Op radio Determine post length + width Create post prep and anti-rotation - before refining coronal prep Extra-coronal prep Eval H:W of axial walls Post length Finial finish Self-etching composite luting cement - Rely X Unicem
50
Name the disadvantages of fibre posts?
Post fracture Loss of retention Bond of composite resin to dentine Bond to post
51
What will determine the success?
Amount and location of the remaining tooth structure
52
Why do we need a core?
Provide retention and resistance form Restoration of coronal tissue Durable coronal seal
53
How can we increase retention and resistance using a core?
Use of adhesive materials to bond to tooth tissues (crown and core) Use of undercuts and grooves in remaining tooth tissue (core) Use of ferrule (crown)
54
How do we assess the need for a core?
1. Can the tooth provide retention for its extra-coronal restoration without additional material being added? 2. Do we need to add material that will aid resistance and retention, or do we just need to block out irregularities? 3. Is there sufficient remaining tooth tissue to retain and support a core? 4. Can a ferrule be achieved?
55
Advantages of the coronal seal? vital and nonvital?
Vital: ➢Provides increased pulpal protection ➢Prevents caries at and beneath restoration margin Non-vital: ➢Provides additional line of defence to endodontic seal ➢Prevents caries at and beneath restoration margin
56
Describe amalgam as a core material? Adv and Dis?
Advantages - Not especially technique sensitive - Strong in bulk section - Sealed by corrosion products - Can be bonded into place with cements and resins Disadvantages - Best left to set for 24 hours before tooth preparation - Weak in thin section - Potential electrolytic action between core and metal crown - Not intrinsically adhesive - Poor aesthetics under ceramic restorations
57
Indications for amalgam as a core material?
 Excellent core build-up material for posterior teeth  Excellent interim restoration for posterior teeth  Adhesives and preparation features can often substitute for pin retention
58
Describe composite as a core material? Adv and Dis?
Advantages - Strong - Can be used in a thinner section than amalgam - Fast setting (either light or chemically cured) - Does not always need a matrix during placement Disadvantages - Highly technique sensitive - Relies on multi-stage dentine bonding requiring effective isolation - Dentine bond can be ruptured by polymerisation contraction - Can be difficult to distinguish between tooth and core during preparation
59
Indications of composite for core build up?
Excellent build-up material for posterior and anterior teeth if isolation assured Aesthetic interim restoration, but takes far longer to place than amalgam
60
Should we remove the exisiting restoration?
Removal of existing restorations allows proper assessment of: ➢The tooth's structural integrity ➢Pulpal exposure ➢Underlying caries
61
Describe the Nayyar core?
“Postless” preparation Retention from coronal and radicular tooth tissue Uses pulp chamber as retention and resistance form
62
Advantages of the Nayyar core?
 Can be placed immediately after endo – reducing risk of coronal leakage  Utilises coronal tooth structure to increase retention  Reduces stresses created by post placement  Usually easily retrievable

CSP3 YR5- Restorative (44 decks)

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