Osce Prep Flashcards
Alginate ingredients
Salt of algenic acid, calcium sulphate, trisodium phosphate, diatomaceous earth fillers, colors, flavors, water at 21*.
Alginate working, mixing and setting times.
Working- 30
Mixing- 60
Setting- 90-120 seconds.
How to mix alginate?
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.
Advantages and disadvantages of alginate?
ADV- easy to manipulate, long shelf life, short setting time, cheap.
DIS- runny mixture can cause gagging, not very accurate, does not release fluoride.
Zinc Oxide Eugenol ingredients.
zinc oxide, zinc acetate, zinc stearate, white resin, clove oil, water.
ZOE working, mixing and setting times.
working- 30
mixing- 60
setting- 2.5-3.5 minutes
How to mix ZOE?
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.
Advantages and disadvantages of zoe?
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.
Zinc Phosphate Ingredients.
Zinc oxide, Magnesium oxide, silicone dioxide, bismuth trioxide, orthophosphoric acid, alumina and water.
Zinc phosphate working, mixing and setting times.
working- 90 seconds
mixing- 60 seconds
setting- 7 minutes
How to mix Zinc Phosphate.
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.
Advantages and disadvanatges of zinc phosphate.
ADV- strong mechanical bond, economic, long shelf life.
DIS- no chemical bond, exothermic, long setting time.
3 types of LA and the strength
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
What is a liner? what is its use?
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
What are bases and what are they used for?
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.
Composite ADV and DIS
ADV- strong chemical and mechanical bond, aesthetic, long shelf life, shade choice is varied.
DIS- does not release fluoride, hydrophobic, light sensitive, not economic.
Glass Ionomer ADV and DIS
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.
What are fissure sealants?
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.
Beauty wax uses.
Records bite registration.
Modelling wax uses.
Reconds jaw relationship during denture construction and used on baseplace to record vertical dimention.
Aluwax uses.
Bite registration and secondary impression.
Gray or green stick wax uses.
Boarder moulding of special trays.
Compound wax uses.
Primary impression material for edentulous patients.
Occlusal indicating wax uses.
Used to check premature occlusal indicating contacts.
Ribbon wax uses.
Used to adapt stock trays for impressions.
Sticky wax uses.
Allows to stick together fractured dentures when broken.
ZOE impression material Times.
Working- 20 seconds
Mixing- 1-2 minutes
Setting- 3-5 minutes
ZOE impression material ADV and DIS.
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.
Vinyl Polysilicate Times.
Working- 1-2 mins
Mixing- 1-2 mins
Setting- 5-7 mins
Vinyl Polysilicate ADV and DIS
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.
What is Glyde?
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.
What is AH+ jet?
Root canal sealing material.
What is Oroseal?
Caulking agent.
Turbine handpiece details.
500,000 rpm, uses friction grip burs, is used to remove tooth structure and to polish restorations.
Straight handpieces details.
40,000 rpm, uses long shank burs, is used during bone surgery or at chairside for lab work.
Conventional handpiece details.
40,000 rpm, uses latch grip burs, used to remove decay and for polishing.
What are pluggers used for?
To pack and condense material into cavity prep.
What are carvers used for?
To shape and carve the material into the correct anatomical occlusion.
What are burnishers used for?
To smooth and polish the restorative material.
What are gates glidden burs used for in endodontics?
To shape and enlarge the coronal third of the canal
What are peeso reamer burs used for?
To remove Gutta Percha material from canal for post preparation.
What is an apex locator used for?
It is used to detect the apical foramen.
What is the electric pulp tested?
It is used during endo examination to see if a tooth is vital.
What are elevators used for?
To elevate/lift and loosen the tooth from the socket
What are cryers used for?
To elevate the root tip.
Types of hemorrhages?
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.
How does Lichen planus look like in the mouth and what are the 2 types?
White lacy patches, white plaques, eroded ulcers. 2 types are active and inactive.
Coe-pack mixing.
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.
3 types of retainers?
Hawley retainer
Essex retainer
Permanent bonded retainer.
