Pulpal Protection

Question 1

why si there pulpal protection

Answer 1

wish to maintain pulpal vitality

Question 2

what si the formative function of dental pulp

Answer 2

produces the dentine that surrounds it

Question 3

what is the nutritive function of dental pulp

Answer 3

nourishes the avascular dentine - non vital teeth brittle

Question 4

what is the protective function of pulp

Answer 4

carries nerves that give dentine sensitivity

Question 5

what is the reparative function of pulp

Answer 5

produces new dentine in relation to physiological wear and unexpected insult such as caries

Question 6

what is the pulp to be protected form

Answer 6

chemical, thermal and galvanic effects

Question 7

what is a source of chemical attack

Answer 7

from restorative materials

Question 8

how can restorative materials attack pulp

Answer 8

acrylic resin - polymeric materials
acids in certain dentine boning agents - cavity close to pulp
residual acid form acifogenic bacteria

Question 9

using water coolant when prepping for cavity minimise what

Answer 9

inflammatory cell activity
following cav prep
cutting gen heat

Question 10

what does cav prep result in

Answer 10

smear layer that occludes tubules

Question 11

what sit he smear layer constituents

Answer 11

bactria from cav
collagen
hydroxyl apetite

Question 12

what are thefeaturs of an ideal pulpal protector

Answer 12

radiopaque
compatible with wide range of restore mats
obtundant

Question 13

what is obtundant

Answer 13

calm soothing effect on dental pulp

Question 14

what is a cavity varnish

Answer 14

polymer in volatile solvent

Question 15

when do u apply cavity varnish

Answer 15

before placing amalgam
solvent evap
residual polymer occludes dentinal tubules
dentinal fluid movement impaired

Question 16

what is the action of cavity varnish

Answer 16

transient short term action

Question 17

what is the seal o cavity varnish

Answer 17

no long lasting coronal seal

Question 18

what is a cavity hydroxide

Answer 18

cavity bases
cement
Dycal

Question 19

what are some features of cavity bases

Answer 19

high pH gives beneficial irritancy 
high pH renders bactericidal 
thermal and electrical insulator 
radio opaque 
good restorative

Question 20

what is another cavity base

Answer 20

polycarboxylate cements

Question 21

what are some features about polycarboxylate

Answer 21

acidic but high MW reduces penetration - mild irritation of pulp
thermal and electrical insulator
strength for condensation
adhesive so coronal seal

Question 22

in poylycarboxylte what does fluoride do

Answer 22

render bacteriostatic

Question 23

i polycarboxylte an obtundant material

Answer 23

no - no calm soothing effect

Question 24

what is reinforced zinc oxide eugenol

Answer 24

cavity base

Question 25

what does reinforced zinc oxide eugenol do

Answer 25

beneficial irritancy bactericidal due to Zn thermal and electrical insulator resin reinforce withstand condensation

Question 26

is reinforced Zinc oxide eugenol radio opaque

Answer 26

yes and obtundant

Question 27

what is reinforced zinc oxide eugenol incompatible with

Answer 27

resin composites non adhesive no coronal seal

Question 28

what is zinc phosphate

Answer 28

cavity bases

Question 29

what is the ph and MW like for zinc phosphate

Answer 29

low pH nd MW of parent acid render them highly irritant

Question 30

what are some other features of zinc phosphate

Answer 30

``` thermal and electrical insulator strength to withstand condensation radio opaque not obtundant non adhesive ```

Question 31

what is glass polyalkenoate

Answer 31

cavity base | chemical or VLC

Question 32

what is the MW of glass polyalkenoate

Answer 32

high parent acid renders them mildly irritant

Question 33

what are some additional features of glass polyalkenoate

Answer 33

thermal and electrical insulator bactericidal adhesive bacteriostatic

Question 34

what are bonded restorations applied to

Answer 34

non adhesive restorations - amalgam - resin composites

Question 35

what are resin composites used with

Answer 35

use acid etch technique for enamel and dentine bonding agent

Question 36

what is used with dental amalgam

Answer 36

use vitrebond (sticky glass polyalkenoate) liner, acid etch, rely - x ARC in uncured state then pack amalgam

Question 37

what do bonded restorations do

Answer 37

seal the cavity margins preventing ingress of fluids and bacteria and so protect the pulp

Question 38

what is ideal depth of cavity

Answer 38

2mm - no lining

Question 39

what do you do if cavity is slightly deeper than ideal

Answer 39

dycal - if restored with galass polyalkenoate then acid etch then dentine bonding agent anterior composite next

Question 40

if a cavity if grossly deep use

Answer 40

dycal and cover with a further layer of vitrebond

Question 41

when placing linings never...

Answer 41

extend them fully to cavity periphery | only dentine overlying the pulp that is covered