Clinical Management

Question 1

What are the five clinic requirements

Answer 1

signed treatment plan (blue)
phase 2 completed treatment form
complex treatment (green sheet)
surveyed diagnostic cast
custom tray if necessary

Question 2

Addition silicone and polyether remained accurate after how much time (and can be poured repeatedly)

Answer 2

1 week

Question 3

What are the two major requirements of a framework impression

Answer 3

records the anatomic form on the teeth

records the moving tissues that will border the denture in an unstrained position

Question 4

What could result if there is under extension of the impression

Answer 4

food impaction

inadequate contours

Question 5

What could result if there is over extension of the impression

Answer 5

sore spots

over contoured or overextended areas

Question 6

What are two major requirements of impression materials

Answer 6

must record tooth and tissue detail accurately

can be withdrawn from tooth and tissue undercuts without permanent deformation

Question 7

What are the primary stress bearing areas of the maxillary arch

Answer 7

posterior alveolar ridges

hard palate

Question 8

What is the secondary stress bearing area of the maxillary arch

Answer 8

anterior alveolar ridges

Question 9

What are the primary stress bearing areas of the mandibular arch

Answer 9

buccal shelf

retromolar pad

Question 10

What is the secondary stress bearing area of the mandibular arch

Answer 10

alveolar ridge

Question 11

What are the four indications for a stock tray with alginate

Answer 11

Kennedy III (tooth supported)
mandibular kennedy I or II
when a secondary impression will be used and the alveolar ridges exhibit adequate support

Question 12

The altered cast impression is dependent on what for a portion of its support

Answer 12

residual ridge

Question 13

How does an altered cast impression obtain retention

Answer 13

from its base aided by indirect retention to precent the dentures lifting away from the residual ridge

Question 14

What are three indications for a custom tray

Answer 14

kennedy class I or II mandibular arch with severe ridge resorption
all maxillary kennedy class I or II RPDs
when modification to a stock tray is not possible

Question 15

This occurs during the setting of elastomeric materials which is proportional to the thickness of the material

Answer 15

dimensional changes

Question 16

Dimensiontal changes are minimized when the thickness was a consistent what

Answer 16

2-3mm

Question 17

These two things directly relate to the distortion of the impression

Answer 17

thickness of the impression

size of the undercut

Question 18

Which causes greater distortion, increased thickness in the impression or increased size of the undercut

Answer 18

increased thickness

Question 19

What are the measurements of custom tray fabrication

Answer 19

1-1.5mm short of the vestibule
2mm wax spacer over teeth
1mm wax spacer of edentulous areas

Question 20

What are two advantages of irreversible hydrocolloid (alginate)

Answer 20

cost

simplicity

Question 21

What are two disadvantages of alginate

Answer 21

must be poured within 15 minutes

border control is difficult

Question 22

Which areas of the maxillary arch are typically modified

Answer 22

palate
posterior border
tuberosity

Question 23

Which areas of the mandible are typically modified

Answer 23

lingual flange

retromolar pad

Question 24

Why would you modify a stock tray

Answer 24

alginate is more accurate at a thickness of approximately 5mm
in an area such as a deep palatal vault or edentulous area there will be more than 5mm of space for alginate

Question 25

What are five precautions involving irreversible hydrocolloid

Answer 25

impression must be held immobile during gelation remove impression from mouth quickly in long axis of teeth impressions should not be immersed in water impressions should be protected from dehydration impression must be poured within 15 minutes

Question 26

What are three precautions of using alginate in terms of pouring casts

Answer 26

measuring the powder and liquid vacuum spatulation use type IV dental stone (pink stone)

Question 27

This has better border control than alginate in an adequate supporting tray

Answer 27

polysulfide

Question 28

What are some advantages of polysulfide

Answer 28

low cost flexible high tear resistance long working time

Question 29

polysulfide has the highest what of elastomeric materials

Answer 29

flow

Question 30

What are four disadvantages of polysulfide

Answer 30

messy must be poured within one hour longer setting time = more chair time custom tray recommended

Question 31

What are four advantages of polyvinyl

Answer 31

automixing cartridges dimensional stability highly accurate shorter setting time than polysulfide

Question 32

What property is polyvinyl excellent at

Answer 32

recovery from deformation on removal

Question 33

What are four disadvantages of polyvinyl

Answer 33

cost increased rigidity lower tear strength custom tray recommended

Question 34

What is it that about the increased rigidity of polyvinyl that makes it hard to work with

Answer 34

does not flow well more difficult to remove from undercuts more difficult to separate casts

Question 35

What are five advantages of polyether

Answer 35

``` short setting time highly accurate dimensionally stable hydrophobic automix cartridges available ```

Question 36

What are six disadvantages of polyether

Answer 36

``` low flexibility extremely rigid low flow cost low tear strength custom tray recommended has limited use in RPDs ```

Question 37

What is the most flexible impression material, which would work well with tall teeth and big embrasure spaces

Answer 37

polysulfide > polyvinyl > polyether

Question 38

What impression material has the best elastic recovery from deformation

Answer 38

polyvinyl > polyether > polysulfide

Question 39

It is important to block out the pontic area of FPDs with wax for which impression materials

Answer 39

polyvinyl and especially polyether

Question 40

What are five possible causes on an inaccurate cast

Answer 40

``` inaccurate water:powder ratio improper mixing of stone trapping of air separation of cast too soon failure to separate the cast for an extended period of time ```

Question 41

What are some things regarding the economics of choosing an impression material

Answer 41

alginate is stupid cheap - 30 cents/impression | while the others range from $60-$10/impression

Question 42

What could be used to increase the patients tolerance of an impression material

Answer 42

topical anesthetic