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BDS3 CLINICAL DMS > Temporary Materials > Flashcards

Temporary Materials Flashcards

1
Q

What are the different types of temporary materials

A

PMMA eg jet
PEMA e.g trim II
Bis-acryl composite e.g protemp
UDMA e.g provipont DC

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2
Q

Is PMMA a direct or indirect material

A

indirect

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3
Q

Is PEMA a direct or indirect material

A

direct/chairside

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4
Q

Is bis-acryl composite a direct or indirect material

A

direct

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5
Q

What is the duration of PMMA material

A

long term

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6
Q

What is the duration of PEMA material

A

short term

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7
Q

What is the duration of bis-acryl composite

A

long term

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8
Q

Is PMMA used for crowns and bridges

A

short and long span bridges

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9
Q

Is PEMA used for crowns and bridges

A

single crowns

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10
Q

Is bis-acryl composite used for crowns and bridges

A

short span bridges

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11
Q

What is the monomer that makes up PMMA

A

mono functional monomer

methacrylate monomer

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12
Q

What are the features of PMMA

A 
powder/liquid formulation
self curing
good marginal fit
good transverse strength
polishable
but:
poor abrasion resistance 
high shrinkage
high thermal release
free monomer may be toxic
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13
Q

How is PMMA formed

A

the mono functional monomer with one C=C double bond forms a linear chain-like polymer

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14
Q

How is bis-acrylate composite form

A

from a bis-GMA monomer
bifunctional (2 C=C double bound)
forms a 3D polymer network

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15
Q

How are all the temp materials formed

A

polymerisation

powder/liquid or 2 pastes (cartridge system)

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16
Q

What are the sources of scientific information on materials

A

journals & product literatures

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17
Q

What is the issue with product literature

A

data is not always complete or accurate

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18
Q

What can product literature be

A

brochures
websites
product profiles

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19
Q

What are the issue with brochures

A

made to sell products
superficial
give a positive presentation

20
Q

What is the issue with websites

A

it is information rich but this means it takes time to sift through information
it is not always the relevant properties

21
Q

What is the issue with product profile

A

scientific info but not definitive

not often supplied for products

22
Q

When we do an assessment what do we look at

A

quality of data

competitive performance

23
Q

What do we look at when looking at quality of data

A

is the data in house (by manufacturers) or independent

24
Q

What are key properties that are of dentists concern

A

temperature of exothermic reaction

material encapsulates tooth prep

safety

25
Q

What are key properties that are of px concern

A

aesthetics

ant. teeth

26
Q

Why is temperature a safety issue

A

there may be a link between thermal change and pulp damage

27
Q

What approach did Zach and Cohen use

A

thermal stimulus applied to teeth using soldering ion and crude and a thermostat was used to record the temperature of the inner tooth surface of pulp chamber

28
Q

What were Zach and Cohens findings

A

2 degrees increase - no effect on pulp histology of controls

5.5 degrees increase - significant tissue changes over first few days, after 56 days most pulps had overcome thermal trauma but some pulps of smaller teeth were necrotic

11 degrees increase - most (two thirds) suffer irreparable necrosis

29
Q

What was the missing factors from Zach and Cohens findings

A

pulpal damage is also affected by duration of the temperature rise experienced

30
Q

What did Tjan’s study show

A

temp taken during fabrication of provisional crown

amount of heat transferred to pulp chamber during polymerization of resins may be sufficient to cause thermal damage to the dental pulp and odontoblasts

31
Q

Why should Tjan’s results be taken with caution

A

in vitro study

doesn’t identify biological environment

32
Q

What did Baldissara’s study show

A

it contradicts the study that a temperature rise of 11.5 degrees will cause pulp tissue damage

33
Q

What was the baldissara experiment protocol

A

use a pair of teeth belonging to same individual

34
Q

What is the experiment for baldissara

A

one tooth was exposed to the thermal stimulus believed to be harmful (symptomatically monitored from 68 to 91 days). extracted and examined histologically to identify possible signs of damage to the pulp

second tooth is extracted and exposed to same thermal stimulus as tooth 1. in order to assess the temperature increase induced in tooth 1 (in vitro) i.e record temperature profile applied

35
Q

What did baldissara results suggest

A

that an increase of 11 degrees will not damage the pulp as there is no signs of inflammation and no reparative processes at higher temperature

36
Q

Are any materials above 11 degrees temp change

A

no

duration also significant

37
Q

How is color stability measured

A

coffee test - 3 days immersion in coffee at 36 degrees

pro temp 4 is best

also objective measure - colorimeter measure in detail, lowest for pro temp

38
Q

What was significant about colors stability of pro temp

A

objective measure showed it was not as good as coffee test

39
Q

Why is polymerization shrinkage significant

A

important for assessing a temp materials accuracy of fit

low PS gives good clinical fit of temp restoration

40
Q

Which materials have lowest shrinkage

A

pro temp and integrity

41
Q

Which materials have highest compressive strength

A

pro temp

560 newton forces but biting can reach 700 newtons

42
Q

What material is most resistant material

A

luxatemp and pro temp

much less resistant than amalgam still

43
Q

Why is surface roughness significant

A

influences appearance

44
Q

Which material has lowest surface roughness

A

luxatemp

protemp 3 grant

45
Q

What are other important factors

A

ease of use

working and setting time

BDS3 CLINICAL DMS (9 decks)

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