Ch. 7, 23, 33, 34, 35

Question 1

use of dental cements

Answer 1

luting agent, pulp protection(liners/bases), temporary restoration, cavity sealers

Question 2

luting agent

Answer 2

have most demanding requirements of any dental material; must set in the mouth, be biocompatible, insoluble in oral fluids

Question 3

pulp protection

Answer 3

dental cements used as intermediate base or liner when remaining dentin is believed to be less than 2mm thick

Question 4

liner

Answer 4

used to protect the pulp from chemical irritation; may stimulate secondary dentin formation (bioactive) or release fluoride; liners are too thin (<0.5mm) to provide thermal insulation, too weak to support restorative materials

Question 5

base

Answer 5

stronger and thicker than a liner; provides thermal insulation; some support restorative material/release fluoride, some are irritating to the pulp before setting reaction has completed

Question 6

varnish (cavity sealer)

Answer 6

composed of resins dissolved in a solvent; varnish is painted on cavity prep including margins, then evaporates and leaves behind a very thin layer of resin; can also function as chemical barrier

Question 7

dentinal bonding agents (cavity sealer)

Answer 7

some dentists will substitute dentinal bonding agents for varnish; ex: Gluma

Question 8

order of placement

Answer 8

if more than one base, liner, varnish, or dentinal bonding system is used, the properties of the materials determine their order; bioactive materials first, then adhesive materials, then irritating materials

Question 9

chemistry of dental cements

Answer 9

dental cements are often a powder/liquid system; liquid is acid, powder is base; powder must be insoluble in oral fluids but reactive with the acid

Question 10

powders used in dental cements

Answer 10

zinc oxide: only insoluble, nontoxic, reactive oxide or hydroxide that is avail. to react with an acid; has some antibacterial effects
powdered glass: powder is white, reacts with strong acid, also contains fluoride which is released

Question 11

What are two dental cements that are frequently used for caries control?

Answer 11

ZOE

GI (glass ionomer cement)

Question 12

What is varnish composed of?

Answer 12

resins dissolved in a solvent

Question 13

The varnish is painted on the entire cavity preparations, including the margins. The solvent then ____________ and leaves behind a very small amount of resin

Answer 13

evaporates

Question 14

• the chemical formula of glass

- very unreactive

Answer 14

silicone oxide

Question 15

What does obtudent mean?

Answer 15

it means that it reduces irritation

Question 16

What does eugenol inhibit?

Answer 16

free radical polymerization

Question 17

The ZOE cement is very obtundent, what does this feature make it useful for?

Answer 17

when pulpal protection is desired or a sedative filling is needed

Question 18

zinc phosphate cements setting reaction is ______________

Answer 18

exothermic

Question 19

Which dental cement should be used before its glossy appearance becomes dull??

Answer 19

glass ionomer