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Operative Dentistry Y2 > Clinical Skills > Flashcards

Clinical Skills Flashcards

1
Q

Describe the 520 bur

A

Friction grip diamond Rosehead bur 0.8 mm diameter

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2
Q

Describe the 544 bur

A

Friction grip diamond domed tip bur for occlusal cavities

3 mm length and 1 mm diameter

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3
Q

Describe the 554 bur

A

Friction grip diamond tapered bur for occlusal reduction and bevel cusps in crown prep. Flat end

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4
Q

Describe the 555 bur

A

Friction grip diamond tapered

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5
Q

Describe the D and Z 850/859 bur

A

Friction grip diamond long thin bur used to clear interproximally during crown prep

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6
Q

Describe the 637 bur

A

Friction grip diamond tapered bur for producing champher for all ceramic crown

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7
Q

Describe the 877 bur

A

Friction grip diamond tapered bur for cutting champher finish line for full Gold crown torpedo shaped

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8
Q

Describe the 701/702 burs

A

Latch grip stainless steel cross cut burs for smoothing

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9
Q

Describe the Rosehead burs

A

Latch grip stainless steel burs for cargoes removal in sizes 1,3 and 5 mm

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10
Q

Describe the 285/773 bur

A

Friction grip diamond rugby ball shaped

Used for occlusal and lingual reduction and shaping cingulum and cusps

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11
Q

What is the free running speed of the air turbine hand piece ?

A

450000-500000 rpm

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12
Q

What is the speed of the contra angled handpiece ?

A

3000-4000 rpm

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13
Q

What is the ideal cavo surface angle for amalgam ?

A

90+/- 20 degrees

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14
Q

What is the role of the number 18 probe in a caries restoration ?

A

Should not be used to diagnose caries, only to detect sound dentine on the floor of the cavity

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15
Q

How long should dentine by air dried for ?

A

3-5 seconds to prevent post op pain

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16
Q

What type of lining is used for amalgam cavities ?

A

Setting calcium hydroxide

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17
Q

What are the advantages of using setting calcium hydroxide as a lining material ?

A

Remineralises dentine

Encourages odontoblasts to lay down reparative dentine

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18
Q

What is the working time of the setting calcium hydroxide lining ?

A

6 mins

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19
Q

What is the purpose of a cavity varnish ?

A

Prevent micro leakage and secondary caries

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20
Q

What type of cavity varnish Is used and how is it applied ?

A

Copal resin dissolved in an ether solvent

3 coats are added with air drying between each coat as circular pits appear when the solvent evaporates

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21
Q

What instruments can be used to carve amalgam ?

A

Wards and half hollenbach

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22
Q

What should waste amalgam be safely stored under ?

A

Water
Old radiograph fixer
Potassium permanganate solution
Container with a vapour lock chemical

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23
Q

What lining is placed under a composite restoration ?

A

Light cured gic

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24
Q

Why should eugenol containing materials never be placed under a composite restoration ?

A

Plasticises the resin base

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25
Q

What are the advantages of placing a gic lining material in a cavity ?

A

Leaches fluoride
Command setting
Bonds to dentine
Similar coefficient of thermal expansion to dentine

26
Q

How long should the gic lining be cured for

A

30 seconds with visible blue light 470 nm

27
Q

What acid is used to etch enamel and dentine before placing composite ?

A

36% buffered phosphoric acid

28
Q

How long should the enchant remain on the tooth?

A

Min 15 secs for enamel

Max 15 secs for dentine

29
Q

What will happen if dentine is over etched ?

A

It will irritate the pulp causing inflammation and pain

30
Q

What type of bonding resin is used for composites, how is it applied and what is its function ?

A

Prime and bond XP
Applied and left undisturbed for 30 seconds
Air dried and then light cured for 10 seconds
The bond penetrates the tubules and triple helix of collagen exposed by the etching process of the inter tubular and peri tubular dentine

31
Q

What does prime and bond XP contain and what products are left behind after air drying ?

A

Nano fillers 7 nm diameter, acetone solvent

Leaves behind penta and organic resins

32
Q

What type of composite can be applied in 3 mm increments ?

A

Spectrum from dentsply

33
Q

What method is recommended for light curing composites ?

A

Cure for 40 seconds from palatal, then buccal then occlusal surfaces
Start from sides first as composite shrinks towards the light source

34
Q

When and how are composites finished ?

A

Can be finished immediately, green and white stones used to recreate anatomy, silicone impregnated tips used to polish, prisma fine then extra fine used at end

35
Q

Which bur is used for an enamel biopsy?

A

520

36
Q

How should enamel appear after it has been etched ?

A

Chalky or frosty

37
Q

What is fissure sealant ?

A

Unfilled resin containing bis gma and tegma and 0.5 % tio2 giving it a white colour

38
Q

What is the purpose of a fissure sealant ?

A

To contain and isolate bacteria remain giant in fissures preventing them from using carbohydrates to produce organic acids

39
Q

What instrument is used to apply fissure sealant ?

A

Excavator

40
Q

What other features of molar teeth should be considered when applying a fissure sealant ?

A

Buccal fissures of mandibular teeth

Palatal fissures of maxillary teeth

41
Q

How long should a fissure sealant be light cured for ?

A

40 s

42
Q

Why should frequent stops be made when removing caries with the rose head bur ?

A

To inspect the adj and ensure it is free from staining and firm to probing

43
Q

What matrix system is used for class II composites ?

A

Palodent matrix system, sectional matrix with bitine ring and foil matrix
The foil Matrix is curved laterally and occluso gingivally

44
Q

Describe xeno IV

A

Self etching and bonding primer
Able to penetrate the micro mechanical pores it creates in enamel and hybrid zone of dentine
The acid primer is applied to tooth and left undisturbed for 30 s
After 30 s the acidic primer will have buffered and neutralised but the time is long enough for the resin groups on the acid to enter the micro mechanical pores
Xeno contains butanol as a solvent giving it a longer working time than bonding agents with acetone
Light cured for 10 s

45
Q

Describe cream X mono composite

A

Nano hybrid composite

Heavily filled giving it strength, wear resistance and reduced polymerisation shrinkage 1% by volume

46
Q

Why should light curing units be regularly checked ?

A

To ensure their intensity remains above 300mW/cm2

47
Q

Which bur is used to cut a self retentive box ?

A

520

48
Q

Which bur is used to cut the retention grooves in a self retentive box and where are they placed ?

A

Small Rosehead bur in the slow handpiece

Grooves placed in buccal and palatal walls of the cavity

49
Q

How many mm is the occlusal reduction for a full gold crown ?

A

1mm non functional cusp

1.5 mm functional cusp

50
Q

Which bur is used to perform the occlusal reduction for a full gold crown ?

A

554

51
Q

How many mm is the cusp bevel reduction for a full gold crown ?

A

1 mm non functional cusp

1.5 mm functional cusp

52
Q

What finish line is recommended for a full gold crown ?

A

135 degree champher

53
Q

Which bur is used to produce the axial reduction and champher finish line for the full gold crown ?

A

877K

54
Q

Which bur is used to clear interproximally during a full gold crown preparation ?

A

D and Z 850

55
Q

Why is a sawing action recommended when using the D and Z 850 ?

A

Increases effectiveness of cutting by the small diameter bur
Increases vision

56
Q

Why might a retention or location groove be placed on a full gold crown preparation ?

A

Is the preparation has low clinical height

57
Q

Which bur should be used to cut a retention groove and where should it be located ?

A

554, 0.5 mm from champher line, on palatal fissure for maxillary teeth and buccal fissure for mandibular teeth

58
Q

Which rotary instruments are used to smooth the edges of an ion provisional crown ?

A

Greenstone or black course soft flex disc

59
Q

What but is used to roughen the inner surface of the temporary crown in preparation for acrylic resin?

A

5 mm Rosehead

60
Q

Which type of acrylic resin is used to fit the temporary crown to the tooth and why ?

A

Trim, poly iso butyl methacrylate as it has a 14% shrinkage and is less exothermic than methyl methacrylate which has a 21% shrinkage

61
Q

What is used to cement a temporary crown in place ?

A

Temp bond, zinc oxide eugenol cement

Operative Dentistry Y2 (7 decks)

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