L6: Dental Cements

Question 1

how are dental cements usually formed ?

Answer 1

mixing powdered metallic oxide or glass with a liquid

Question 2

what are the types of cements ?

Answer 2

type 1 luting cement: used in temporary and permanent fillings

type 2 restorative cements : used in temporary and permanent fillings

type 3 :liner and base application

Question 3

what are luting cements used for ?

Answer 3

sealing space between 2 substance

Question 4

what film thickness should luting cements have ?

Answer 4

less then 25um

Question 5

what do type 3 cements ( base and liner ) do?

Answer 5

provide thermal and galvanic insulation . they contain ceramic powdered which allows them to have lower thermal and electrical conductivity then metals

Question 6

what type of cement is zinc phosphate and what reaction does it involve?

Answer 6

type 1 luting cement (25um)

or type 2 restorative cement if thickness is 25-40um

acid-base reaction that is exothermic

Question 7

what technique is used to combat rise in temperature ( exothermic reaction) when mixing zinc phosphate ?

Answer 7

incremental mixing

controlling the ratio of liquid to powder also affects the temperature

Question 8

low viscosity cements are known as?

Answer 8

luting agents

Question 9

what powder is the key powder?

Answer 9

zinc oxide

Question 10

what mechanism is responsible for mechanical retention of zinc phosphate ?

Answer 10

interlocking

Question 11

how does zinc polycarboxylate bind to tooth?

Answer 11

chemical bonding

Question 12

What mineral leeches from zinc polycarboxylate ?

Answer 12

fluoride which acts as an anti-caries agent

Question 13

which type of cement is zinc polycarboxylate ?

Answer 13

type 1 luting cement , base , and temporary restorative cement

Question 14

what is the only cement does that not involve an acid-base reaction? ( oil-based)

Answer 14

zinc oxide eugenol (chemically neutral) (other cements are acidic)

Question 15

which cement has a obtundent effect ?

Answer 15

zinc oxide eugenol

Question 16

what is the most commonly used temporary cement?

Answer 16

zinc oxide eugenol , it is also used as temporary luting cement , and to seal exposed dental tubules, as well as a lining cement but not with resin based composite

Question 17

what cement is often used alongside amalgam ?

Answer 17

zinc phosphate

Question 18

zinc oxide eugenol does not form a chemical bond

Answer 18

:D

Question 19

why to zinc oxide eugenol cements usually disintegrate?

Answer 19

free eugenol from the cement leaches out and is replaced by water

Question 20

why cant zinc oxide euganol be used with resin composites ?

Answer 20

because it interferes with the polymerization process

Question 21

what is calcium hydroxide used for “?

Answer 21

pulp capping ( as protective barrier beneath amalgam and resin composites)

provides alkaline environment

baase-liner

Question 22

DYCAL is an example of which dental cement ?

Answer 22

calcium hydroxide

Question 23

what form does calcium hydroxide come in ?

Answer 23

paste

Question 24

setting reaction of calcium hydroxide and glycol-salicylate results in formation of ____

Answer 24

calcium-disalicylate

Question 25

why does calcium hydroxide have anti-bacterial effects ?

Answer 25

because it provides an alkaline environment

Question 26

how is calcium hydroxide applied ?

Answer 26

in thin sections not exceeding 0.5mm

Question 27

calcium hydroxise is applied in deep cavities near pulp with potential formation of secondary dentine

they do not provide thermal insulation and are weakened by moisture

Answer 27

:D

Question 28

non-setting calcium hydroxide is widely used in____

Answer 28

pulp therapies

Question 29

what is cavity varnish used for ?

Answer 29

protect glass ionomer filling

prevention of corrosion of amalgam

it is insoluable in oral fluid which reduces microleakage between restoration margins and walls of tooth cavity

Question 30

what is pulp capping ?>

Answer 30

A procedure to treat pulp that has been exposed
through caries removal or trauma, by the application of a medicament;