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BDS2.5 Dental Materials - operative dentistry > Tricalcium Silicate cements as pulp protection materials > Flashcards

Tricalcium Silicate cements as pulp protection materials Flashcards

1
Q

What are the tricalcium silicate cements?

A

a group of materials based on calcium silicate chemistry

related to MTA (mineral trioxide aggregate)

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2
Q

What are the calcium silicates related to?

A

MTA

mineral trioxide aggregate

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3
Q

How does MTA interact with tissue?

A

bioactive/biocompatible

kind to tissues

placed in direct contact with living tissues

better healing

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4
Q

What is the problem with original MTA?

A

take a long time to set

new materials have been developed to protect the dental pulp

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5
Q

What are types of MTA?

A

1) ProRoot MTA (gry or white)

2) MTA-angelus

3) Neo MTA plus

4) TheraCal LC (light cure) - controversial

5) Bio-aggregate

6) biodentine (septodont)

7) tri-calcium phosphate

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6
Q

What material is the focus of this lecture?

A

biodentine (septodont)

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7
Q

What has allowed the increased rate of the biodentine? (MTA)

A

particle size so distribution is optimised

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8
Q

What has been added to biodentine to optimise its reaction rate?

A

calcium carbonate and calcium chloride

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9
Q

What are the 2 basic components of the biodentine?

A

liquid and a powder

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10
Q

What is the main core material of the powder?

A

tricalcium silicate

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11
Q

What is the second core material of the powder?

A

dicalcium silicate

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12
Q

What are the fillers of the powder component?

A

calcium carbonate and calcium oxide

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13
Q

What contributes to the shade of biodentine?

A

iron oxide

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14
Q

What contributes to the radiopacity?

A

zirconium dioxide

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15
Q

What does the liquid part of biodentine contain?

A

hydrosoluble polymer water reducing agent

superplasticising agent - reduces water content of mixture while helping to retain its workability - surfactant effect

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16
Q

What is the accelerator in the liquid part biodentine?

A

calcium chloride

17
Q

Why is biodentine called an hydraulic cement?

A

due to the hydration reaction between

18
Q

How is the hydrogel created?

A

calcium silicates partially dissolve in liquid

produce hydrogel of hydrated silicate

19
Q

What happens to the biodentine over time?

A

decrease in material porosity and an increase in its compressive strength over time

20
Q

What is the setting material of biodentine like?

A

has hydrating tricalcium silicate cement grains surrounded by a matrix of calcium silicate hydrate, calcium hydroxide and calcium carbonate

21
Q

What does calcium carbonate act as in the setting material?

A

acts as a nucleating site on which calcium silicate hydrates - responsible for high calcium ion release

22
Q

What are the physical properties of biodentine?

A

similar compressive strength and hardness than dentine

similar flexural modulus as dentine

high dimensional stability (don’t have to worry about expansion and contraction etc)

low fluid uptake and sorption

high washout

doesn’t discolour

23
Q

What is biodentine designed to be placed on?

A

both on dentine and vital pulp tissue

24
Q

What does it mean hat biodentine is bioactive?

A

induces pulpal cell proliferation and cytokine release

hard tissue formed with an interface synthesised with dentine via a dynamic mineral interaction zone similar to hydroxyapatite composition

plugs of the mineral have been observed in dentinal tubules

kind to living tissues (biocompatable)

25
Q

What is the dynamic interaction zone?

A

zone of a mineral layer, where material is interacting with the dentine and a hard tissue forming

26
Q

what is the pH of septodont and what does it promote?

A

8.2 - promotes inflammatory cell recruitment and therefore healing

27
Q

Does septodont allow a good seal?

A

yes, better microleakage resistance

28
Q

Is septodont good at marginal restoration?

A

yes

29
Q

Can septodont bond to infected dentine?

A

no, but it can bond to affected dentine

30
Q

When would you use biodentine?

A

deep cavities - describes as a dentine substitute

reversible pulpitis - can be left as a dressing and then smoothed down for subsequent restoration

carious iatrogenic exposure

trauma - aim to protect pulp and let it repair itself

pulpotomy in primary molars

31
Q

Why is biodentine better than calcium hydroxide?

A

maintaining long-term pulp vitality after indirect and direct pulp-capping

less pulpal inflammatory response and more predictable hard dentine bridge formation

32
Q

What is the working time of septodont?

A

6 mins

33
Q

How long do you leave for the septodont to set?

A

12 mins from start of mix

34
Q

What are 2 ways to use septodont clinically?

A

leave as a dressing and then smoothed down for subsequent restoration

cover with resin composite or dental amalgam

35
Q

Do you etch with phosphoric acid?

A

no, use selective etch

reacts - acid/base reaction

36
Q

What are other products available?

A

NRC

TheraCal LC

37
Q

What does NRC incorporate?

A

HEMA

38
Q

What is NRC similar to?

A

white MTA

compressive strength and ph similar

39
Q

What is the problem with TheraCal LC?

A

resin itself did not chemically react with cement powder

it remains unchanged with the composite

you get no leaching of calcium hydroxide

it doesn’t work

BDS2.5 Dental Materials - operative dentistry (22 decks)

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