snowball q's for exam 1

what was the first dental school in the US?

baltimore college of dental surgery

who were the first group of people to use public health codes?

hebrews

in four handed dentistry, the hidden syringe method is done in the patients full view

false

which part of the world still uses the miswak tooth brush?

middle east and africa

a peridontal dressing is indicated for all periodontal surgical procedures

false

what is the purpose of the scalpel?

to cut or trim tissue

an example of a non-eugenol containing periodontal dressing is?

hydrogenated fat pack and coe pak

this instrument is used to exam the tooth and detect anomalies through the sense of touch

explorer

What area of dentistry is concerned with the etiology, diagnosis and treatment of diseases of the dental pulp?

endodonitcs

interrupted sutures are the most commonly used. simple sutures are considered versatile?

both are true

what are key properties in impression materials

disinfectable

reproduction of detail

dimensional stability

what is the oldest type of elastomeric impression material

polysulfide

registered dental hygienist are able to place sutures ONLY in perio clinics in the state of michigan

false

When a dentist places a matrix band on a tooth it is important for the dentist to contour the matrix band before placing it. Which instrument will best assist in contouring the matrix band?

ball burnisher or burnisher

how do you improve your patients apperance to make a peridontal dressing less noticeable?

With a curet, festoon the dressing around each tooth so that it follows the CEJ. Keep the dressing below the height of contour and interlock interproximally

what are instrument transfer methods?

- hidden syringe method

- two handed instument transfer method

- pick up and delivery method

what are characteristics of an ideal peridontal dressing?

slow set, smooth, maintain flexibility to withstand distortion

what is the difference in the process formation of plaster as compared to stone?

plaster requires only heat

when passing instuments using four handed dentistry, where do you pass them in association to the paitent?

in front of the paitent, except for the syryinge

what type of gypsum is used for dental stone?

Type III

which gypsum product has the highest compressive strength?

die stone

when using the pick-up and delivery method, what is the prober technique?

one hand, thumb and first two fingers for delivery last two fingers for pick up

the more O's after the diameter of the suture material the bigger the diameter

false

dental stone and plaster have different chemical formulas and dental stone is much denser

the first statement is false, the second is true

what is classified as flexible (ELASTIC) dental impression materials

- irreversible hydrocolloid

- polyether rubber

- polysulfide rubber

what is the weakest part on a suture needle

the swag

which of the elastic impression materials should you delay pouring up for at least one hour?

polyether

how do you remove an alginate impression tray from the mouth?

with a quick snapping motion to prevent distortion

what impression material is the most used for the favrication of a crown and or bridges in the US

addition silicone

the three color qualities are hue, chroma, and value

true

who is known as father of dental hygiene

Dr. alfred fones

which is NOT a requirement for an ideal impression material

maintains hard shape with no change

imbibition is a characterisitic of gels to contact and squeeze out some liquid that then accumulates on the surface

false

why are sutures considered one of the greatest medical advances in history?

wound closure, stabilize, replace or put back tissue with minimal scarring, hemostasis, keeps bony tissue covered, hold medicament or surgical drain in place, increase chance of recovery

if a suture material is made up of a synthetic polymer; it is broken down by tissue enzymes

false

excess stone in the rubber bowl can be washed down the sink if soaked in warm water?

false

purposes for a periodontal dressing

- provides splinting for mobile teeth

- allows wound to heal undisturbed

- reduces the likelihood of secondary bleeding

the smaller the diameter of suture material, the less tensile strength

true

the liquid phase of a colloid is called a sol

true

type 2 laboratory plaster is used only intra-orally

false

what is condenser used for

packing material

in four handed dentistry, what is the proper position of the dental assistants chair

top of assistants chair 4-6 inches higher than the operator

the assistants hand is divided into two parts in what instrument delivery method. what fingers are used for which part?

Pick up and delivery method; thumb and first two fingers form the delivery part and last two fingers are pick up

In both the three and four number instrument numbering systems, the first unit describes?

the width of the blade in tenths of millimeters

what is the most widely used impression material

alginate

what is the working time for alginate

2-3 minutes

what is the water powder ration of plaster?

50g/100g

colloids have two phases, one liquid and one semi solid called

sol/gel

impression plaster is no longer used for impression material

true

what is the difference between gypsum and alginate

Alginate is a material used to make impressions. Gypsum is a material used to make models or die to work on

what is a test for hardness

- brinell

- vickers

- dickenson

- knoop

Eugenol containing periodontal dressing are not used as much any more due to which of the following negative characteristics of the eugenol?

- it contributes to delayed healing

- it may cause inflammatory or allergic reactions

- it may cause tissue necrosis

During viscoelastic testing, creep is permanent strain that ____________ with time under constant load.

increases

when hemihydrate stone is mixed with water what does it revert back to?

dihydrate

agar is the most widely used impression material

false

what are the advantages of silk sutures

inexpensive, flexible, easy to tie, and soft to the tongue

what is the purpose of four handed dentisry

minimize stress and fatigue and

increase productivity

calcination changes a

dehydrate form to a hemihydrate form

once an impression is rinsed and shaken to remove excess water, it does not need to be disinfected

false

what is the function of impression material

a) accurately record the dimensions of oral tissues and their special relationships, 2)provide a negative replicate/cast of the oral structures.3)end goal is to have a model or die to work on that is and exact replica of the shape of the oral tissues,4) used for diagnosis, manufacturing restoration and manufacturing other oral appliances

what is a hemostat used for

originally used to clamp severed blood vessels now used to grasp tissue, root tips, bone fragments or broken needles

to prevent cross contamination between patients and healthcare workers, what should dental provides do immediately after an impression is take?

Rinse the impression under running water, put in bag and spray or rinse with disinfectant

what is the first step in the suturing technique

loop needle holder twice away from you

What year were sutures first used and caused a huge increase in recovery from surgeries and injuries

1800

Can be changed from a liquid solution or sol into a rubber like gel simply by raising or lowering its temperature.

reversible hydrocolloid

Calcination drives off 2 water molecules. This changes the original dehydrate form to a ______________

hemihydrate

What area of dentistry is concerned with the growing dentition and how teeth and jaws come together?

orthodontics

Early evidence of traumatic injury of dental origin dated back to

250 million years ago

A periodontal dressing (periopak) is kept in place ____________ by _____________ in inter-dental spaces and by joining the lingual and facial portions of the pack.

mechanically, interlocking

What is the study of disease cause, course, and effects of disease including associated changes in function and structure?

pathology

Class II motions involve movements of the fingers, wrist, and elbows.

false

Which dental specialty is the branch of dental art and science pertaining to the restoration and maintenance of oral function?

prosthdontics

Which elastic impression material has the least accurate surface detail, is least expensive and most widely used?

alginate

The second unit in a three number instrument describes:

length of the blase in millimeters

Powder must be placed in the rubber bowl first, then water is slowly mixed into the water to prevent clumping?

false

what does aqueous mean

contains water

what is another name for gypsum

calcium sulfate dihydrate

An alginate impression is a ______________. When you pour it up it becomes a _______________. That is considered a true authentic reproduction of the oral cavity?

negative, postitive

what color is die stone

blue or green

polysulfide impression material must be poured within

30 min- several hours

if calcium sulfate dihydrate is heated between 100o C - 130o C without adding pressure, the dehydrate is transformed to hemi-hydrate. This hemihydrate is used in dental stone.

the first is true the second is false

What instrument is designed or utilized to pick up material from a source and carry it to the oral cavity?

carrier

during the instrument trasfer, you pass the syringe

behind the paitents head

How much does productivity increase with the use of one assistant?

78%

Calcium sulfate di-hydrate with added pressure is transformed into a different hemi-hydrate called dental stone.

true

What technique do you use to hold a high speed evacuator tip?

thumb to nose

What class of motion conservation is the movement of fingers only?

class 1

Type II Impression plaster is stronger than Type I because of ____________ water /powder ratio?

lower

What is the purpose of sutures?

wound closure, stabilize, replace or put back tissue, hemostasis, keeps bony tissue covered, hold medicament or surgical drain in place

What type of knot is used in suture placement?

square knot

Another name for an interrupted suture is_______________?

simple

When suturing start with the least attached tissue and pull toward the most anchored tissue

true

Calcium phosphate dihydrate is another name for gypsum.

false

The chemical reaction that takes place in gypsum products is __ _________.

exothermic

The correct powder-to-water ratio for stone is 100 grams of powder to 50 ml of water.

false

Name two (2) factors that can effect setting time?

amount of water is increased or decreased; temperature of water is increased or decrease

What is the ball burnisher used for?

to smooth out roughness of a restoration

Name three types of instrument transfer

hidden syringe, two handed and pick-up and delivery

Out of the five classes of motion conservation, which classes are most preferred?

Class I, II and III

Horizontal mattress sutures is a box like suture used in areas where there is wide interproximal space?

true