Dental Materials Unit 3

Where are sealants placed?

Posterior teeth

What are sealants?

Sealants prevent bacteria from getting into the pits and fissures to stop decay

In the state of Iowa

Dental assistants cannot legally place sealants

What are desensitizers?

Agents that are used to reduce or eliminate sensitivity by plugging dentinal tubules

what is etch?

consists of a gel with acid in it to remove the smear layer.

what are the three steps of bonding systems?

etch, bond, and prime

glass ionomers

have fluoride in them to help remineralize the tooth

what can cements be used as?

bases and liners to help with sensitivity and insulation under a large restoration

failure to remove excess cement can cause what?

trauma to the gum tissue and peri-implant disease

loading the crown for cementation

should be loaded by creating a layer covering every internal surface of the crown

direct materials

are placed directly into the cavity prep, chairside

macrofilled composites

stronger

microfilled composite

easier to polish

composite

wears faster than amalgam restorations

larger/posterior composites

must be placed in layers because the curing light will not harden more than 1-2mm at a time

what are the two most common resin matrices used in composite?

BLS-GMA or UDMA

compomers

have added fluoride to them to get some of the benefits of a glass ionomer in composite form

dental alloys contain

silver, tin, and copper

alloy

is mixed with mercury to create amalgam

amalgam

has been used for over 175 years as a restorative

tarnish

the oxydation reaction of metals in amalgam that cause it to turn black

galvanism

the reaction that creates an electrical discharge when two different metals touch each other