chapter 3

Question 1

what are cements

Answer 1

cements are generally hard, brittle materials formed when a powdered oxide/glass is mixed with a liquid.

Question 2

what are cements used for, give examples

Answer 2

they are used to retain restorations such as alloy ar ceramic crowns and bridges and estheric inlays onlays and veneers

Question 3

when mixed to a thicker consistency than the cementing consistency what are they used for

Answer 3

as TEMPORARY FILLINGS or to provide thermal insulation and mechanical support to teeth restored with other materials such as amalgam composites or gold

Question 4

what is a major function kf dental cements

Answer 4

the retention of restorations on prepared teeth

Question 5

name some strong cements that are used for permanent cementation

Answer 5

GIC, compomer., reinforced zinc oxide-eugenol, zinc phosphate cements.

Question 6

cements are classified into 3 categories what are they

Answer 6

water based, oil based , and resin based

Question 7

what are water-based cements

Answer 7

GIC
zinc polycarboxylate cement
zinc phosphate cement

Question 8

what is gic primarily used for

Answer 8

it is a water based cement used for the final cementation of alloy crowns and bridges

Question 9

what cements are uses for cementation of alloy crowns and bridges

Answer 9

GIC
zin phosphate
zinc polycarboxylate
reinforced zinc oxide eugenol

Question 10

what cements are used as temporary fillings

Answer 10

zinc oxide eugenol
reinforced ZOE
zinc polycarboxylate

Question 11

what cements are used as liners

Answer 11

calcium hydroxide

Question 12

direct vonding of orthodontic brackets

Answer 12

Resin

Question 13

Root canal sealer

Answer 13

ZOE

Question 14

what does reinforced restorative cement mean

Answer 14

the same cement but wjth added silver

Question 15

How many types of GIC are there

Answer 15

there are 4

Question 16

what is the type II of gic used for

Answer 16

restoration

Question 17

what is type III of GIC used for

Answer 17

For linner and bases

Question 18

what is type I of GIC used for

Answer 18

luting

Question 19

What is type IV of Gic used for

Answer 19

pit aand fissure sealant

Question 20

if the dentinal thickness is less than 0.5 mm then what is the best cement for lining calcium hydroxide or GIC

Answer 20

calcium hydroxide

Question 21

after solidifying, which cement has a higher solubility in oral fluids ,zinc phosphate cement or GIC

Answer 21

Zinc phosphate cement

Question 22

if we are using cemet for luting what maximum thickness can it attain

Answer 22

25 micrometers

Question 23

what cements have an obtundant/sedative effect on the pulp and are eapecially used on prepared tooth with eposed deninal tubules

Answer 23

Zinc oxide eugenol cements

Question 24

what are zinc oxide non eugenol cements used for

Answer 24

short term cementation for temp acrylic crown and completed cast restorations

Question 25

the purpose of reinfoced ZOE

Answer 25

permanent luting

Question 26

define retention

Answer 26

is the result of micromechanical interlocking of the restoration and prepared tooth

Question 27

setting time of ZOE increases with what 2 factors

Answer 27

moisture and heat

Question 28

time if mixing calcium hydroxide must not exceed

Answer 28

30 seconds

Question 29

time of work of calcium hydroxide must not exceed

Answer 29

1 minute

Question 30

calcium hydroxide is used

Answer 30

for regrowth of bone kills bacteria used as a liner because of its high ph (11.3-15)

Question 31

permanent luting of crowns and bridges on NON VITAL teeth we use what cement

Answer 31

zinc phosphate cement

Question 32

what is the effect of increasing powder to liquid ratio of zinc phosphate cement on 1. viscosity 2. setting time 3. strength 4. solubility and acidity

Answer 32

١.تعطي مزيج أكثر لزوجة ٢. تتقص من زمن التصلب ٣. تزيد من متانة الاسمنت (زيادة صعوبة التطبيق) ٤. تقلل من انحلاله ومن حموضته

Question 33

highly ranked for their antibacterial potential and are used as low strength bases and temporary fillings

Answer 33

ZOE