Osce Prep

Question 1

Alginate ingredients

Answer 1

Salt of algenic acid, calcium sulphate, trisodium phosphate, diatomaceous earth fillers, colors, flavors, water at 21*.

Question 2

Alginate working, mixing and setting times.

Answer 2

Working- 30
Mixing- 60
Setting- 90-120 seconds.

Question 3

How to mix alginate?

Answer 3

Add equal scoop of powder to water ratio into a bowl.
create a small well in the powder with fishtail spatula.
Add water into the well.
Mix the material in circular motions and against the bowl to ensure there are no air bubbles in the mixture.

Question 4

Advantages and disadvantages of alginate?

Answer 4

ADV- easy to manipulate, long shelf life, short setting time, cheap.
DIS- runny mixture can cause gagging, not very accurate, does not release fluoride.

Question 5

Zinc Oxide Eugenol ingredients.

Answer 5

zinc oxide, zinc acetate, zinc stearate, white resin, clove oil, water.

Question 6

ZOE working, mixing and setting times.

Answer 6

working- 30
mixing- 60
setting- 2.5-3.5 minutes

Question 7

How to mix ZOE?

Answer 7

3.3:2 Scoop to liquid ration is placed onto a mixing pad.
with a weston spatula the powder is divided into four increments.
one by one the increments are brought into the liquid and mixed in a 8 shape until the material can be rolled into a sausage shape.

Question 8

Advantages and disadvantages of zoe?

Answer 8

AVD- history of life, long shelf life, has soothing properties for the dentine.
DIS- smells potent of eugenol, does not adhere well to enamel, hydrophobic.

Question 9

Zinc Phosphate Ingredients.

Answer 9

Zinc oxide, Magnesium oxide, silicone dioxide, bismuth trioxide, orthophosphoric acid, alumina and water.

Question 10

Zinc phosphate working, mixing and setting times.

Answer 10

working- 90 seconds
mixing- 60 seconds
setting- 7 minutes

Question 11

How to mix Zinc Phosphate.

Answer 11

2:4 power to liquid ratio.
place ingredients on a glass slab.
Break into six increments and individually bring powder into the liquid.
mix in a figure of 8 until material is stringy.

Question 12

Advantages and disadvanatges of zinc phosphate.

Answer 12

ADV- strong mechanical bond, economic, long shelf life.

DIS- no chemical bond, exothermic, long setting time.

Question 13

3 types of LA and the strength

Answer 13

local anaesthetic is the loss of pain sensation over a specific area due to the administration of a drug which blocks nerve condruction.
Lidocaine 2% with 1:80,000 epinephrine
Articiane 40mg/ml with 1:100,000 epinephrine
Scandonest 3% mepivicaine

Question 14

What is a liner? what is its use?

Answer 14

It is a thin pulp cap used to protect the pulp in restorations. 
Mix the base and catalyst together.
Working time- 10 sec
Mixing- 60
Setting- 2-3 minutes

Question 15

What are bases and what are they used for?

Answer 15

It is a thick pulp cap used to protect the pulp from damage in restorations.
Working- 10 sec
Mixing- 60 sec
Working- 40 under LC.

Question 16

Composite ADV and DIS

Answer 16

ADV- strong chemical and mechanical bond, aesthetic, long shelf life, shade choice is varied.
DIS- does not release fluoride, hydrophobic, light sensitive, not economic.

Question 17

Glass Ionomer ADV and DIS

Answer 17

ADV- releases fluoride, strong chemical and mechanic bonds, radio-opaque, long shelf life.
DIS- not a lot of shade options, requires additional instruments, technique sensitive.

Question 18

What are fissure sealants?

Answer 18

A material which creates a barrier between pits and fissures of a tooth from decay causing bacteria to accumilate and form caries. used with etch and bond and light cured to harden.

Question 19

Beauty wax uses.

Answer 19

Records bite registration.

Question 20

Modelling wax uses.

Answer 20

Reconds jaw relationship during denture construction and used on baseplace to record vertical dimention.

Question 21

Aluwax uses.

Answer 21

Bite registration and secondary impression.

Question 22

Gray or green stick wax uses.

Answer 22

Boarder moulding of special trays.

Question 23

Compound wax uses.

Answer 23

Primary impression material for edentulous patients.

Question 24

Occlusal indicating wax uses.

Answer 24

Used to check premature occlusal indicating contacts.

Question 25

Ribbon wax uses.

Answer 25

Used to adapt stock trays for impressions.

Question 26

Sticky wax uses.

Answer 26

Allows to stick together fractured dentures when broken.

Question 27

ZOE impression material Times.

Answer 27

Working- 20 seconds
Mixing- 1-2 minutes
Setting- 3-5 minutes

Question 28

ZOE impression material ADV and DIS.

Answer 28

ADV- very accurate, dimensionally stable, can be poured up more than once, history of use.
DIS- smell of eugenol, needs vaseline as it sticks to skin, long setting time.

Question 29

Vinyl Polysilicate Times.

Answer 29

Working- 1-2 mins
Mixing- 1-2 mins
Setting- 5-7 mins

Question 30

Vinyl Polysilicate ADV and DIS

Answer 30

ADV- very accurate, can pour up more than once, history of use, dimensionally stable.
DIS- needs good moisture control, needs a light and regular body for mix, long setting time, expensive.

Question 31

What is Glyde?

Answer 31

A root conditioner which facilitates cleaning and shaping of root canal by lifting debris from canal. the gel effervencence when in contact with sodium hypochloride.

Question 32

What is AH+ jet?

Answer 32

Root canal sealing material.

Question 33

What is Oroseal?

Answer 33

Caulking agent.

Question 34

Turbine handpiece details.

Answer 34

500,000 rpm, uses friction grip burs, is used to remove tooth structure and to polish restorations.

Question 35

Straight handpieces details.

Answer 35

40,000 rpm, uses long shank burs, is used during bone surgery or at chairside for lab work.

Question 36

Conventional handpiece details.

Answer 36

40,000 rpm, uses latch grip burs, used to remove decay and for polishing.

Question 37

What are pluggers used for?

Answer 37

To pack and condense material into cavity prep.

Question 38

What are carvers used for?

Answer 38

To shape and carve the material into the correct anatomical occlusion.

Question 39

What are burnishers used for?

Answer 39

To smooth and polish the restorative material.

Question 40

What are gates glidden burs used for in endodontics?

Answer 40

To shape and enlarge the coronal third of the canal

Question 41

What are peeso reamer burs used for?

Answer 41

To remove Gutta Percha material from canal for post preparation.

Question 42

What is an apex locator used for?

Answer 42

It is used to detect the apical foramen.

Question 43

What is the electric pulp tested?

Answer 43

It is used during endo examination to see if a tooth is vital.

Question 44

What are elevators used for?

Answer 44

To elevate/lift and loosen the tooth from the socket

Question 45

What are cryers used for?

Answer 45

To elevate the root tip.

Question 46

Types of hemorrhages?

Answer 46

A hemorrhage is an escape of blood from a ruptured blood vessel.
Primary- during treatment.
reactionary- a few hours after treatment
secondary- a couple days after treatment.

Question 47

How does Lichen planus look like in the mouth and what are the 2 types?

Answer 47

White lacy patches, white plaques, eroded ulcers. 2 types are active and inactive.

Question 48

Coe-pack mixing.

Answer 48

Release equal portions of base and catalyst onto a mixing sheet. Using a mixing spatula mixing in a figure of 8 until all of it is incorporated. Emerse the pack into some warm water to remove some of the tacky texture to manipulate it in the hands. Gloves must be lubricated with either water or vaseline.

Question 49

3 types of retainers?

Answer 49

Hawley retainer
Essex retainer
Permanent bonded retainer.