Autumn Quiz: final impression techinques + provisional 2

Question 1

what are the cord thicknesses

Answer 1

000, 00, 0, 1, 2, 3

Question 2

where should the first cord go and what is it for?

Answer 2

BELOW the margin

• for SULCULAR STABILITY.
• prevents blood and crevicular fluid from contaminating the margin

-noo overlapping

Question 3

what is the second cord packed for

Answer 3

for lateral displacement

• • flash?
• remove just before taking impression. we will remove it before taking impression, this is to give us “space” in the gum tissue

Question 4

what are the 2 types of pvs materials for final impression

Answer 4

heavy body (blue) to load tray

light body (pink) on prep

Question 5

whats the tray adhesive for

Answer 5

makes sure impression material sticks to the tray..

Question 6

how long do you seat stock tray on mouth

Answer 6

approximately 5-6 minutes, till pvs is set

Question 7

what is the working time and the full set time for the pvs material?

Answer 7

working time is 2 minutes
full set is 5 to 6 minutes.
-both heavy and light should set at the same time to blend right

Question 8

what requirements must be met for the final impression

Answer 8

• exact duplicate of prep, enough FLASH below margin for accurate definition of the margin
• other teeth must accurately be reproduced in order to articulate the casts correctly. NO tray show through
• free of bubbles and voids, especially in area of finish line
• impression material MUST NOT be separated from the tray

Question 9

why do we want flash

Answer 9

the more flash, the easier ti is to trim the dies during laboratory phase of crown fabrication

Question 10

how much do we remove on putty at cervical area

Answer 10

2-4 mm (gives leeway when contouring provisional)

Question 11

what is lubricant used for with provisionals

Answer 11

to lubricate typodont but NOT in real practice?

Question 12

how long do you leave putty on typodont after seating with resin for provisional

Answer 12

about 1 minute. check consistency w explorer

Question 13

how do you remove the temp from the typodont

Answer 13

with spoon

Question 14

how long is the temp kept in the putty after removing it from the typodont

Answer 14

6 minutes
(clean typodont while doing this)

Question 15

how do you use a splint to make a provisional?

Answer 15

first- poke vent holes from INSIDE of splint to allow excess to escape. can also be used with perio probe to ensure occlusal reduction
-load splint with resin, seat, and use same procedure as putty matrix.

Question 16

what will pinpoint contact do

Answer 16

will cause temp to be less retentive and lead to food impaction

Question 17

how do you remove air inhibited layer ?

Answer 17

on resins like bis-acrylic and composite

-remove with alcohol on cotton swab for less mess when adjusting the temp?

Question 18

what does a fracture on provisional indicate

Answer 18

undercut/under tapered, fractures during removal
-under reduced, thin temp- fractures easily

check for thin areas with light

Question 19

what does an open margin on provisional indicate about prep

Answer 19

if its closed in some areas; it indicates that flash is preventing seating of the temp. or margin opened up when trimming it.

-if open circumferentially, the temp is not fully seated. so first try cleaning it. relieve intaglio with polishing points or fine finishing bur
prep also could be undercut, under tapered or sharp

Question 20

what can high occlusion of a temp result in?

Answer 20

• fracture of restoration or tooth
• pain/discomfort
• damage to periodontium. can accelerate bone loss in patients with perio disease

Question 21

what symptoms will come with inflammation of PDL (occlusion caused)

Answer 21

• pain to biting and percussion
• sensitivity to cold
• usually resolves when occlusion is adjusted

Question 22

what study did filippi/tecco do for rats and malocclusion

Answer 22

-placed composite “bite pad” on upper right molor of rat. took x ray after 1 week. then placed composite on upper left molar, take x ray after another week.

• first week- unbalanced occulsion
• second week- occlusion was REbalanced

Question 23

how do you remove occulsion marks

Answer 23

with rubbing alcohol on typodonts (ONLY)

Question 24

how do you clear occlusion marks

Answer 24

with the footballs- red or yellow/
check multiple times, not exact science, use some common sense. if bulls eye (too dark), smear (too light, false occlusion mark)
-check occlusion on ADJACENT teeth toolook for open bites!

Question 25

how can you CONFIRM a bite is correct

Answer 25

• take off temp and check wtih articulating paper
• memorize marks on adjacent teeth, then wipe off teeth
• put temp on, check with paper again
• marks on adjacent teeth should be the same

ONLY check occlusion when you are SURE temp is seated completely.