9/27 Recorded Lecture: Tissue Management & Recording Impressions

Question 1

TF? Elastomeric material that has set remains elastic.

Answer 1

T

Question 2

What to include in crown impression

Answer 2

Adjacent teeth and tissue surrounding those teeth

Question 3

All elastomeric material are hydrophobic except:

Answer 3

polyethers

Question 4

Means to increase sulcus size to take impressions:

Answer 4

mech, chem, or surgical

Question 5

These can lead to permanent soft tissue damage, ie recession:

Answer 5

improper manipulation of impression material, poor tissue displacement technique

Question 6

3 prerequisites to successful impression taking:

Answer 6

healthy tissue, saliva control, …

Question 7

Ways to maintain tissue health:

Answer 7

control pd, careful prep, interim resto

Question 8

Methods of saliva control:

Answer 8

cotton rolls placed by ducts, moisture absorbing cards, flange-type evacuator, e.g., Svedopter (speejector), retractors), la, anti-sialagogic meds

Question 9

Antisialogogic meds:

Answer 9

ABCH: atropine, bromide, clonidine, hypochloride

Question 10

How does la effect saliva control?

Answer 10

blockage of impulses from the pdl, considerable reduction

Question 11

Sulcus will remain open this long after cord removal/ mechanical retraction:

Answer 11

30s

Question 12

how to surgically remove small amts of tissue:

Answer 12

scalpel, electrosurgery or laser

Question 13

What is being stretched cord placement?

Answer 13

periodontal circumferential fibers

Question 14

Means of tissue displacement w impregnated cord:

Answer 14

mechanico-chemical retraction

Question 15

Cord placement is easier using:

Answer 15

braided or knitted cord

Question 16

How long to leave cord in and when to take out:

Answer 16

5 min, directly before taking the impression

Question 17

3 types of cords

Answer 17

BTK: braided twisted, and kneaded

Question 18

Cord types for mech displacement:

Answer 18

twisted, knitted

Question 19

Cord is impregnated with:

Answer 19

epi or aluminum potassium sulfate

Question 20

Alternative to cord packing:

Answer 20

paste system, contains aluminum chloride

Question 21

2 names for cord without chemical:

Answer 21

plain, non-impregnated

Question 22

One cord remains in sulcus when using this technique:

Answer 22

double cord technique

Question 23

List the 5 cord thicknesses:

Answer 23

000, 00, 0, 1, 2

Question 24

What determine the size cord to use?

Answer 24

sulcus depth, tooth location

Question 25

Benefit of twisted cord:

Answer 25

can customize cord, ind strands can be removed

Question 26

Issue w using braided cord:

Answer 26

can double up and bc too thick & cause gingival trauma

Question 27

compressible cord type:

Answer 27

knitted

Question 28

Cord types we use in clinic:

Answer 28

braided and knitted

Question 29

Classifications of chemicals used to displace gingiva:

Answer 29

astringents, vasoconstrictors

Question 30

Ex's of astringents;

Answer 30

aluminum chloride (AlCl3), ferric sulfate (Fe2(SO4)3

Question 31

vasoconstrictors:

Answer 31

sympathomimetic (effects similar to sym system) amine-containing eye wash/ epi

Question 32

2 ways vasocs restrict blood flow:

Answer 32

decreases cap size, tissue fluid seepage

Question 33

Issue epi cord can cause:

Answer 33

tachycardia

Question 34

Don't use epi cord for these pts:

Answer 34

high BP, diabetes, cv disease, and hyperthyroidism

Question 35

Moa of astringent:

Answer 35

transient ischemia shrinking gingiva, tissue fluid leakage

Question 36

Are astringents acidic or basic?

Answer 36

acidic

Question 37

What to be aware of when using astringent:

Answer 37

if adhesive cement is used for restoration, minimize contact with tooth, affect smear layer

Question 38

Hemodent pH:

Answer 38

1.2

Question 39

Astrigident pH

Answer 39

0.7

Question 40

Least acidic astringent we use at SDM

Answer 40

Viscostat:

Question 41

packing cord:

Answer 41

cord should not overlap

Question 42

Which cord is impregnated w astringent in the double cord tech?

Answer 42

2nd, larger

Question 43

1st cord is called __, 2nd cord is called __:

Answer 43

preparation cord, impression cord

Question 44

Where to start cord placement:

Answer 44

interproximal area, deeper sulcus

Question 45

Ex of paste for tissue displacement:

Answer 45

expasyl, made of aluminum chloride and kaolin

Question 46

Is expasyl mech, chem, or both?

Answer 46

both

Question 47

Function of aluminum chloride:

Answer 47

hemostasis

Question 48

Function of kaolin:

Answer 48

tissue retraction, very viscous

Question 49

What is removed with electrosurgery?

Answer 49

inner epi lining of gingival sulcus (sulcular lining)

Question 50

What might be an issue if the tissues are inflamed?

Answer 50

more bleeding

Question 51

Potential harm of electrosurgery:

Answer 51

gingival recession

Question 52

Disadvantages of electrosurgery:

Answer 52

Can't use on pts w electronic mx devices or thin attached gingiva, or w metal instruments bc it could shock, deep soft tissue anesthesia req

Question 53

Pts w these mx devices can not get electrosurgery:

Answer 53

pacemaker, transcutaneous electrical nerve stimulation (TENS) unit, insulin pump

Question 54

Attached gingiva, where you can not do electrosurgery:

Answer 54

labial tissue of max canines

Question 55

Biologic width:

Answer 55

CT + je, formed next to tooth, sup to crestal bone

Question 56

There is a proportional relationship bw:

Answer 56

alveolar crest, ct attchament AND epi attachment and sulcus depth

Question 57

biological width is about:

Answer 57

2.04mm

Question 58

Invasion of the biological width may cause:

Answer 58

gingival irritation, enlargement, gingival and bone recession

Question 59

If the margin of a restoration is very close to alveolar bone, this can happen:

Answer 59

inflammation, recession

Question 60

How to prevent invasion of biologic width with lesions that approach the alveolar bone:

Answer 60

crown lengthening, also inc's ferrel

Question 61

Retention of impression material to prefabricated tray is provided by:

Answer 61

perforations, rim locks, adhesives

Question 62

What influences the type of tray you will use for a impression?

Answer 62

material type

Question 63

Property that prefabricated trays must have to red distortions of impression:

Answer 63

rigidity, design that will control material thickness

Question 64

What type of impression material do we use to take impressions for crown fabrication?

Answer 64

elastomeric

Question 65

Effect of moisture contamination while taking impression:

Answer 65

voids

Question 66

improper fitting interim can lead to:

Answer 66

gingival enlargment

Question 67

Cord packing technique we use at SDM:

Answer 67

double

Question 68

Why isn't electrosurgery used more often?

Answer 68

potential for gingival recession

Question 69

If the margin of a resto is w/in __mm of the alveolar bone it may lead to issues:

Answer 69

2mm

Question 70

When to use prefabricated trays:

Answer 70

uncomplicated fixed prosth