14. Dls

Question 1

means establish for the time being,

Answer 1

interim

Question 2

it must terminate the finish line and not in the grounds which will cause inflammation

Answer 2

TEMPORARY RESTORATION

Question 3

→ check anatomy and health of tissue
→ if inflammation is present, the final crown cannot be installed
right away

Answer 3

TEMPORARY RESTORATION

Question 4

protect pulp for a vital tooth

o if we leave it exposed, patient may feel sensitivity because of dentinal tubules

Answer 4

BIOLOGICAL

Question 5

→ maintain periodontal health
o overhang and excess cervical areas must be removed to
prevent inflammation

Answer 5

BIOLOGICAL

Question 6

→ provide occlusal compatibility
o there should be no contacts or interference when the patient bites on it against opposing tooth

Answer 6

BIOLOGICAL

Question 7

→ maintain tooth position

• tooth is anchored by periodontal ligament
• there might be instances where the tooth will move; once it moves, there will be a hard time inserting crowns or bridges
  → protect against fracture

Answer 7

BIOLOGICAL

Question 8

resist functional loads

Answer 8

MECHANICAL

Question 9

→ resist removal forces
o design of reduction

Answer 9

MECHANICAL

Question 10

→ maintain inter-abutment alignment
*contact areas must be maintained, spaces that are lost must be regained by the temporary restorations and maintain alignment

Answer 10

MECHANICAL

Question 11

→ easily contourable
→ color compatibility
→ translucency
→ color stability

Answer 11

ESTHETIC

Question 12

These things will overlap and there is an optimum interim restoration when all are satisfied

Answer 12

ESTHETIC

Question 13

mold cavity is created by two correlated parts:

Answer 13

*External Surface Form (ESF)
* Tissue Surface Form (TSF)

Question 14

→ external contour of the crown
→ what you see (anatomy, size, and shape of the temporary
restoration)

Answer 14

EXTERNAL SURFACE FORM

Question 15

EXTERNAL SURFACE FORM has (2) categories:

Answer 15

o Custom
o Preformed

Question 16

is a negative reproduction of either the patient’s teeth before preparation or a modified diagnostic cast

Answer 16

CUSTOM

Question 17

maybe directly obtained with any impression material (irreversible hydrocolloid and silicone are convenient)

Answer 17

CUSTOM

Question 18

easy accurate reseating done by trimming the thin areas of
impression material (interproximal or gingival margin)

Answer 18

CUSTOM

Question 19

True or false

various preformed crowns are available commercially

Answer 19

True

Question 20

→ choose one which will fit the tooth that is to be prepared
→ after restoring the teeth, you can use the vacuum type of template (transparent)

o place cast on a vacuum machine → template

o after reduction of abutments → temporary crowns using template

Answer 20

PREFORMED

Question 21

→ baseplate wax can be used as it is more convenient and economical but more complicated
→ some people make escape holes so that when injected there are no bubbles

Answer 21

PREFORMED

Question 22

→ most crown forms need modifications: internal relief, axial re-contouring, occlusal adjustment in addition to lining procedure
→ generally limited to use as a single restoration because it is not
feasible to use them as pontics for FDPs

Answer 22

PREFORMED

Question 23

→ has the most natural appearance

Answer 23

POLYCARBOXYLATE

Question 24

available in single shade (monolithic)

Answer 24

POLYCARBOXYLATE

Question 25

cervical to incisal has a different hue and chroma but this only has one shade

Answer 25

POLYCARBOXYLATE

Question 26

→ available for incisors, canine and premolar teeth (not for molars) → limited use

Answer 26

POLYCARBOXYLATE

Question 27

True or false polycarbonate crown forms are more tolerable, selected to establish contact areas

Answer 27

True

Question 28

→ crown form consists of thin, soft, and transparent material → becomes a shell

Answer 28

CELLULOSE ACETATE

Question 29

→ size and shape can be selected from a mold guide → crown form is trimmed and festooned to fit the preparation without impingement on the soft tissue → available in all tooth types

Answer 29

CELLULOSE ACETATE

Question 30

True or false shape will not conform the cellulose acetate

Answer 30

False (shape WILL conform the cellulose acetate)

Question 31

suitable for posterior teeth since it is colored

Answer 31

ALUMINUM

Question 32

→ have anatomical shaped occlusal and axial surface (ridges can be seen) → care must be taken during try in verification of their delicate margins

Answer 32

ALUMINUM

Question 33

→ adapt the margins to the finish line → as it is highly ductile, it allows easy contouring to conform to the shape of the finish line

Answer 33

ALUMINUM

Question 34

available for posterior teeth

Answer 34

TIN-SILVER

Question 35

→ alloy (mixture of tin and silver) is very soft and the margin of the crown can be flexed prior to the seating with a swaging block → can be contoured since it is flexible

Answer 35

TIN-SILVER

Question 36

Produce a close marginal fit after the shell is trimmed with a bur

Answer 36

TIN-SILVER

Question 37

→ fit will depend on how you form and contour so that it can sit on the finish line → rest of the surfaces should also be lined with acrylic resin (self-cure) to provide good internal adaptation and retention of the temporary restoration → modify the cervical (contour or cut) to fit the prepared abutment

Answer 37

TIN-SILVER

Question 38

→ used in children with extensively damaged primary teeth → cannot be altered with resin

Answer 38

NICKEL-CHROMIUM

Question 39

→ crowns can be easily re-contoured using pliers → indicated for long-term interim restorations

Answer 39

NICKEL-CHROMIUM

Question 40

→ prepared tooth surface and edentulous ridge (when present) → more concerned with what’s in contact with the tissues → shape of crown in cervical, labial, and lingual areas

Answer 40

TISSUE SURFACE FORM

Question 41

TISSUE SURFACE FORM has (3) categories: o Indirect o Direct o Indirect-direct

Answer 41

o Indirect o Direct o Indirect-direct

Question 42

made by the lab

Answer 42

“custom”

Question 43

not in the patient’s mouth

Answer 43

“indirect”

Question 44

technique involves fabrication of the interim restoration outside the mouth

Answer 44

CUSTOM INDIRECT PROVISIONAL RESTORATION

Question 45

ADVANTAGES → no contact of free monomer with the prepared teeth or gingiva which might cause tissue damage and an allergic reaction or sensitization

Answer 45

CUSTOM INDIRECT PROVISIONAL RESTORATION

Question 46

ADVANTAGES → the technique avoids subjecting prepared tooth to the heat evolved from the polymerizing resin

Answer 46

CUSTOM INDIRECT PROVISIONAL RESTORATION

Question 47

ADVANTAGES indirect technique produces restoration with a superior marginal fit and as an auxiliary is involved in fabricating the restoration in the lab, it frees the patient and dentist for considerable amount of time

Answer 47

CUSTOM INDIRECT PROVISIONAL RESTORATION

Question 48

the technique produces a custom made preformed external surface form of the restoration but the internal tissue surface form is formed by the underprepared diagnostic casts–lesser than the ideal

Answer 48

CUSTOM INDIRECT-DIRECT INTERIM RESTORATION

Question 49

ADVANTAGES → with the combination indirect-direct technique, chair time can be reduced since the provisional shell is fabricated before the patient’s appointment

Answer 49

CUSTOM INDIRECT-DIRECT INTERIM RESTORATION

Question 50

ADVANTAGES → enhanced control over restoration contours minimizes the time required for chair side adjustments

Answer 50

CUSTOM INDIRECT-DIRECT INTERIM RESTORATION

Question 51

ADVANTAGES smaller amount of acrylic resin will polymerize in contact with the prepared abutment, resulting in decreased heat generation, chemical exposure, and polymerization shrinkage compared to the direct technique

Answer 51

CUSTOM INDIRECT-DIRECT INTERIM RESTORATION

Question 52

DISADVANTAGES → the disadvantage of this procedure is the potential need of a laboratory phase before tooth preparation and the adjustments that are frequently needed to seat the shell completely on the prepared tooth

Answer 52

CUSTOM INDIRECT-DIRECT INTERIM RESTORATION

Question 53

DISADVANTAGES potential tissue trauma from the polymerizing resin and inherently poorer marginal fit o these resins produce heat when setting

Answer 53

CUSTOM INDIRECT-DIRECT INTERIM RESTORATION

Question 54

DISADVANTAGES → therefore, the routine use of directly formed interim restoration is not recommended when indirect techniques are feasible

Answer 54

CUSTOM INDIRECT-DIRECT INTERIM RESTORATION