Chp 13 Abrasion, finishing, polishing and cleaning

Goal of finishing, polishing, cleaning

to remove excess material, improve surface, and esthetics

finishing

removes excess material

can be done by using a burr, strips and abrasive disc, come in varying coursness

polishing

removing scratches of the surface

course to fine

helps to be resistant to biofilm

they have to have a Moh’s hardness (scale 1-10 .. 1 softest 10 hardest)

cleaning

removes biofilm from surface of restoration or appliance

Q. The procedure used to remove excess restorative material to develop appropriate occlusion, contour and functional form; usually done with rotary cutting instruments is ….

finishing

Abrasion

process of scraping or wearing away. take into consideration material, abrasive being used and what is being abraded.

substrate - surface being abraded

abrasive - material composed of particles - hardness or sharpness to cut or scrap a softer material

What abbrasives do we use in dentistry?

flour of pumice - size of particles determine the courses

diamond burs - most abrasive, used for adjusting and contouring restorations

How to measure hardness?

mohs scale of harness

1 is soft and 10 is hard (diamond)

Q. A material composed of particles of sufficient hardness and sharpness to cut or scratch a softer material when drawn across it’s surface is…

abrasive

Size of particles

larger particles - more efficient in cutting but scratch more

Q. The term grit is used to describe ____ of the abrasive particles

size

When do you polish restorations?

overtime they can get rough and cause irritation

smoother the surface the harder for biofilm to attach

lengthens the longevity of the restoration

selective polishing - use correct material when polishing teeth, that will cause the least amount of damage

Two body abrassives

direct contact abrasives. sand paper discs etc,

attritions

tooth to tooth contact abrasion

three bodied abrasives

paste , loose abrasives

micro-particles

air pressure- high pressure that hits the tooth.

abrasion materials

diamond (most abrasive)

silicon carbide

tungsten carbide finishing burs

aluminum oxide emery (burlew wheel)

sand

silicon dioxide

pumice

tin oxide (fine)

rouge (not used in oral cavity)

calcium carbonate (low abrasive)

sodium bicarbonate (low abrasive)

glycine (low abrasive)

potassium and sodium (very low abrasive)

Products we used that abrasion comes in

prophy paste 10x more abbrasive to enamel and 20x more to dentin vs. tooth paste at home (has fluoride)

denture cleaners

be cautious, water, toothpaste ,mild cleaning agent

can go in a solution of water w/ dental cleaning tablets

do not use - bleach, reg toothpaste or household cleaners

T/F Chlorine bleach is the recommended product to clean metal framed removable protheses

false

Proper finishing and polishing increases…

the life of the restoration - decreases biofilm, corrosion, attrition, it gives it a longer life, esthetics,, healthy gingiva

margination /flash

removal of excessive material from the margins of the restoration

flash is a feather like excess restorative material that is present at the margins

overhangs ooze out under matrix band

Q. A feather like excess of restorative material present at the margins of a restoration typically on occlusal and proximal surfaces is called..

flash

How long do you have to wait to polish an amalgam restoration after placed?

24 hours after it is placed

most abrasive to…

least abrasive when polishing

implants are made from..

titanium

scaler or ultrasonic that is also titanium

T/F Care must be taken to ensure an implant is not scratched furing the oral prophylaxis procedure

True

T/F It is recommended that titanium implants be cleaned using a instruments made of titanium

true

When would you adjust a chairside denture?

after a new denture is created there can be high spots, it can be taken down using special burrs.

Oral prophy polishing

selective polishing - only polishing teeth that have stain

Q. Polishing every patients teeth is no longer recommended. If a patient needs to have their teeth polished, we follow the philosophy of_____ polishing

selective

air abrasion

used micro particles propelled in air , not sucessful so no longer used

air polishing

common, used to remove extrinsic stains and biofilm

powder based material w/ air polisher make sure pt doesnt have allergies to product.

T/F air abrasion/ microabrasion is the chairside cleaning of cast appliances before cementation, intraoral repair of ceramic and composite restorations, and preparation of tooth surfaces before bonding.

True

______ is the powder used during an air abrasion/micro abrasion procedure

aluminium oxide

How does the patient care for their restoration?

restorations pick up stains and good home care needs to be preformed, thorough removal of biofilm.