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CASE PRES > Crowns/inlays/onlays > Flashcards

Crowns/inlays/onlays Flashcards

1
Q

What are the clinical stages in indirect restorations?

A
  • preparation
  • temporisation
  • impression and registration
  • cementation
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2
Q

What are the characteristics of a good provisional restoration ?

A
  • good margin
  • well contoured with no overhangs
  • Cleansable for the patient
  • prevent sensitivity
  • prevent microleakage
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3
Q

What will a poorly fitted and contoured provisional restoration result in ?

A
  • make it hard to clean
  • poor moisture control
  • gingival overgrowth
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4
Q

What are the ideal characteristics of provisional materials

A

non irritant
low temperature rise during setting
dimensionally stable
adequate setting time
adequate strength
good aesthetics

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5
Q

What are examples of provisional restorations?

A
  • protemp plus (chemically cured bisacrylic composite resin)
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6
Q

What type of impression would you take?

A

sectional , due to difficulty of reseating

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7
Q

What materials would you take the impression with? and what is the characteristics?

A
  • alginate (cheaper and can’t be reused)
  • addition cured silicone putty (tear resistance and can be reused)
  • custom vacuum formed plastic mould (stent) (made on study model and diagnostic wax up )
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8
Q

what is the steps in crown

A
  1. sectional impression
  2. prepare tooth
  3. syringe bis acrylic composite resin
  4. relocate impression in the mouth
  5. remove before complete polimerisation at rubbery stage
  6. polish
  7. remove
  8. confirm tooth preparation using svensen gauge
  9. check marginal fit and occlusion and aesthetics
  10. check aesthetics
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9
Q

What will you use to cement temporary restoration?

A
  • Temp bond (non-eugenol temporary cement material)
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10
Q

What is svenson gauge used for?

A

check tooth preparation and provisional thickness

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11
Q

How to remove current crown?

A
  • sliding hammer
  • WAMkey
  • safe relax anthrogyr
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12
Q

What advice would you give a patient after temporising the crowns?

A
  • maintain good oral hygiene
  • advice in interdental cleaning 1-2 times a day
  • be carful when using floss as it may pull out the restoration
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13
Q

What are the contraindications of indirect restorations?

A
  • poor OH
  • high caries rate
  • inter-proximal caries
  • gingival recession
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14
Q

Why did you restore the 47 with an onlay?

A
  • there are still cusps available
  • to replace the failed direct restoration
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15
Q

What difficulties might you face regarding the onlays?

A
  • poor moisture control
  • may take a long time to fabricate in lab
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16
Q

Why restore teeth with crowns?

A
  • to protect the tooth structure
  • improve aesthetics
  • when it is indicated by RPD (consider rest seats, clasps and guideplanes)
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17
Q

What guidelines would you use to treatment plan restorations?

A

BSRD (the British society for restorative dentistry)

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18
Q

What does under preparation for a crown result in?

A
  • occlusal interference
  • poor aesthetics
  • Pulp and tooth strength being compromised
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19
Q

How can you improve crowns retention?

A

by limiting the number of path of insertions (to prevent the removal of the restoration along the path of insertion)

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20
Q

What is resistance?

A

prevents dislodgment of the restoration by the forces in apical or oblique directions

21
Q

What is the ideal taper of crown prep walls?

A

6 degrees

22
Q

What does longer crown prep walls cause?

A

interfere with tipping displacement

23
Q

What can you do to improve crown retention?

A

the use of grooves and slots

24
Q

What are the types of finish line ?

A
  • knife edge
  • bevel
  • chamfer
  • shoulder
  • bevelled shoulder
25
Q

How should the margins of the crown be?

A
  • smooth and fully exposed to cleansing action
  • placed where the dentist can finish them and the patient can clean them
  • placed at gingival margin whenever possible
26
Q

What are the dimesions of MCC crown prep

A
  • Axial reduction : 1.3mm
  • Occlusal reduction on functional cusp : 1.8mm
  • occlusal reduction on non functional cusp: 1.3mm
  • Finish line:
    Chamfer 0.5mm
    Shoulder: 0.4mm metal and 0.9mm pocelain
27
Q

What are the stages of preparation for a metal ceramic crown?

A
  • occlusal reduction : tapered fissure bur
  • separation: long tapered diamond bur (5-10 degrees)
  • Buccal reduction in two planes ( apical and coronal)
  • palatal or lingual reduction - diamond chamfer bur
  • shoulder and chamfer finish: use tungston carbide tapered shoulder bur or parallel shoulder bur for shoulder
  • smooth and polish
  • check occlusion
28
Q

What is the most common reason the lab cannot construct crown?

A
  • insufficient occlusal clearance
29
Q

What would be the difficulties when placing a veneer?

A
  • heavy occlusal contacts
30
Q

What material would you use for buccal veneers?

A

composite

31
Q

Why should you keep veneer preparation in enamel?

A
  • because composite bonds better to enamel
32
Q

how to prepare veneers and what are the dimensions?

A
  • depth cuts
  • incisal reduction 1-2m
  • middle third : 0.5mm
  • cervical third : 0.3mm
33
Q

What are the types of prep for veneers?

A
  • feather
  • window
  • bevel
  • incisal overlap
34
Q

What would you say to the patient about veneers and crowns when consenting?

A
  • they will fail at some point
  • may then need something more comprehensive
35
Q

What are indirect restorations?

A

restorations fabricated outside the mouth by a technician in a laboratory

36
Q

What is an onlay?

A

an extra-coronal restoration fabricated outside the patient mouth for cuspal coverage

37
Q

What are the three types of onlays?

A

gold, composite , porcelain

38
Q

What is the reductions in preparation of onlays?(porcelain)

A
  • non working cusp - 1.5mm
  • working cusp - 2mm
  • margins - 1mm shoulder and shamfer
39
Q

What information would you give the lab?

A
  • tooth
  • material
  • thickness
  • shade
  • characteristics
40
Q

Which cement would you use to cement ceramic onlays?

A

Nexus ( dual composite resin cement)

41
Q

What cement would you use to cement MCC?

A

-Aquacem

42
Q

What type of veneer would you use and why?

A
  • overlappes incisal edge (so it has more retention and lasts longer)
43
Q

What other types of veneers are there ? (not material)

A
  • feathered incisal edge
44
Q

When to mark tooth contacts?

A
  • before preparing a tooth
  • before removing a restoration
  • after placing a crown
  • after placing a restoration
45
Q

Why did you choose a semiadjustable articulator?

A
  • it allows you to set the condylar and bennet angle
46
Q

What is an example of a semi adjustable articulator?

A
  • Denar
47
Q

What is bennet angle?

A

-The Bennett angle is the angle formed between the initial path of the mandibular condyle during lateral movement and the sagittal plane
- recorded to know the lateral shift of the mandible in lateral movement of the condyle on the non working side

48
Q

What are you reviewing when mounting casts on an articulator?

A
  • TMJ function
  • incisor relationship
  • molar relationship
  • open or cross-bites
  • guidance
  • wear facets severity of tooth-wear
  • restoration fractures
  • occlusal contacts
  • working and non working side contacts

CASE PRES (7 decks)

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