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BDS2 OSCE > Cons lab > Flashcards

Cons lab Flashcards

1
Q

what is found in an exam pack?

A

(4) mouth mirror, right angled probe, perio probe, college tweezers

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2
Q

what instruments are found in the restorative tray? (9)

A

(9) small excavator, large excavator, small flat plastic, large flat plastic, large flat ended packer, small flat ended packer, half hollenback carver, Ward’s carver, ball ended burnisher

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3
Q

what instruments are found in the cavity margin finishing tray?

A

(3) enamel hatchet, mesial gingival margin trimmer, distal gingival margin trimmer

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4
Q

what rubber dam instruments are found in our instrument kits?

A

anterior clamp, premolar winged clamps, molar winged clamp, molar wingless clamp
rubber dam punch, rubber dam frame (Young’s type), rubber dam forceps

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5
Q

what other tools are found in our instrument packs?

A

Ash SS spatula, Dycal applicator, amalgam carrier, Millers forceps, Sickle scaler H6 and H7, contra angle probe 28/29, tofflemire matrix band holder, Siqveland matrix band holder, glass slab, curved crown scissors, dissecting tweezer, bur block, mandrel, safety specs

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6
Q

what tablets do you add to the phantom head water?

A

ICX tablets - to prevent biofilm build up

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7
Q

does the motor go on the slow or fast handpiece?

A

slow

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8
Q

what cavity prep burs are there?

A

541 diamond, 542 diamond, small round diamond, large round diamond

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9
Q

what are the dimensions of the 541 diamond bur?

A

width 1mm
length 3mm

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10
Q

wny are rubber dams used?

A

to create a controlled operative field

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11
Q

advantages of rubber dam

A

aseptic environment
allows use of caustic intra-canal medicaments
controls saliva
retraction and protection of soft tissues
improves access and provides optimum visibility

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12
Q

what is the basic rubber dam kit?

A

punch, clamp forceps, clamps, rubber dam, frame
scissors, excavator/flat plastic, floss, tweezers, wedgets

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13
Q

what do rubber dam clamps do?

A

hold the rubber dam onto the tooth

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14
Q

difference between winged and wingless dams

A

winged have small projections allowing it to be mounted on dam prior to application. wingless are applied directly to tooth

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15
Q

why do we floss clamps?

A

if the clamp fractures we can retrieve the fragments

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16
Q

methods of dam placement (4)

A

dam stretched over tooth first and then clamp applied
dam attached to winged clamp and applied to tooth together
dam placed over bow of wingless clamp and applied to tooth - then dam stretched over clamp
clamp on first and stretch dam over clamp

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17
Q

where should the bow of the dam be placed?

A

distal surface of tooth

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18
Q

what is Black’s classification of cavities?

A

class I - occlusal edge affected of molars and anteriors
class II - affecting interproximal areas (MOD) of posteriors
class III - interproximal areas of anterior teeth
class IV - interproximal areas and incisal edge of anterior teeth
class V - affecting gingival third of anterior or posterior teeth
class VI - affecting cusp tips
view image!!

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19
Q

what is ICDAS code 0

A

sound tooth, no detectable demineralisation after 5 seconds of air drying

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20
Q

what is ICDAS code 1

A

white spot lesion, visible after prolonged air drying

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21
Q

what is ICDAS code 2

A

distinct visual change in enamel (visible when wet or dry)

22
Q

what is ICDAS code 3

A

established enamel lesion, visible when wet or dry. but no dentine is visible

23
Q

what is ICDAS code 4

A

underlying dark shadow from dentin (with or without enamel breakdown)

24
Q

what is ICDAS code 5

A

distinct cavity with visible dentin

25
Q

what is ICDAS code 6

A

extensive distinct cavity with visible dentin

26
Q

why do we do fissure sealants?

A

for deep inaccessible fissures with high localised caries risks

27
Q

process of fissure sealant

A

air dry well
etch for 30-60 seconds
wash and dry (should have frosted appearance)
use ball-ended instrument to add sealant material in increments
light cure for 60 seconds

28
Q

what does PRR stand for?

A

preventive resin restoration

29
Q

process of PRR

A

diagnostic etch followed by fissurotomy using 541
etch cavity for 15s
apply adhesive, evaporate solvent, light cure
remove caries
fill with flowable composite, light cure 20s
fissure seal and light cure

30
Q

how to get access to an ICDAS class 4 lesion?

A

541 or pear-shaped diamond fissurotomy bur

31
Q

what tool is used for caries excavation?

A

rosehead steel burs or hand excavators

32
Q

what does carious dentine feel like and when do you stop excavating?

A

it is necrotic, soft and removable
stop when it is hard and leathery and firm
test using probe

33
Q

difference between caries infected, affected and sound dentine?

A

infected - soft/sticky feel with sharp dental probe
affected - both sticky/flaky and scratchy feel
sound - scratchy

34
Q

what does affected dentine have the capacity to do?

A

potential to remineralise, so preserve it

35
Q

how to complete a composite restoration

A

gain access and remove caries
etch for 15s, wash and airdry
apply adhesive and light cure
fill with bulk-fill flowable composite
place fossae and shape the fissures
assess occlusion

36
Q

what is the lower 6 fissure pattern?

A

dryopithicus

37
Q

what should a class 1 cavity prep for composite be like?

A

uniform depth 1.5mm
flat floor
follow fissure pattern
at least 1mm from marginal ridge (residual thickness)
upright internal walls and parallel
cavity wide enough to allow examination of fissures and composite placement (not more than 1/3 intercuspal width)

38
Q

what should the approx. dimensions of the class one cavity prep be?

A

2.0
1.0
3.0
1.5
2.0

39
Q

how many increments of composite should be used?

A

depends on depth
one if cavity is <2mm deep

40
Q

what is temporary dressing made of?

A

zinc oxide and eugenol (ZOE)

41
Q

how do you make the temporary dressing? what amounts etc?

A

3 drops of liquid, 2x1 powder
mix in increments until stiff non-sticky consistency
roll into sausage, mix should cut easily

42
Q

how should you apply amalgam?

A

press amalgam and mix for 8 seconds
press into amalgam carrier and apply
pack in increments and overfill
burnish amalgam from restoration to tooth using ball ended burnisher
shape fishers using burnisher and 1/2 hollenback carver

43
Q

requirements for a MOD amalgam cavity prep

A

smooth outline - no weak enamel
clearly defined margins
cervical margins clear of contacts
proximal margins clear of contact
vertical/undercut occlusally
straight box walls that converge
>=2mm depth
rounded internal line angles
box margins meet proximal surface and 90 degrees
no damage to adjacent teeth

44
Q

how to pack amalgam for an MOD

A

boxes first
smaller instruments
quickly
heavy pressure
tight against band

45
Q

what extra tool is needed for an MOD restoration?

A

matrix band

46
Q

what types of matrix bands are there?

A

Tofflemire or Siqveland

47
Q

what is used to smooth amalgam?

A

pumice/glycerine mix using rubber cup with light pressure

48
Q

placement technique of siqveland matrix band

A

latch must be locked into gingivally facing slot
pull the occlusal latch mesially
occlusally facing slot is always open
correct orientation results in an occlusally divergent matrix

49
Q

What are the advantages of amalgam?

A

Cheaper
Easier placement
Highly durable
Can do subgingival restoration
Don’t need moisture control
Strong - can fill large cavities

50
Q

What are the advantages of composite?

A

More aesthetic (More shades than GIC etc)
Less invasive (less tooth tissue removal as can bond)
No environmental concerns (as with amalgam mercury)
Can be placed in thin section
Bond very well to enamel
Material isn’t affected by temperature or prone to expanding or contracting

51
Q

Disadvantages of amalgam

A

Mercury levels are safe but some people still concerned
More invasive preparation
Less aesthetic
May expand and contract with temperature exposure, resulting in fractures

52
Q

Disadvantages of composite

A

Shorter lifespan
More costly than amalgams
Increased time of placement
Good moisture control needed

BDS2 OSCE (15 decks)

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