Tricalcium Silicate Cements as Dental Pulp Protection Materials Flashcards Preview

Semester II - Dental Materials > Tricalcium Silicate Cements as Dental Pulp Protection Materials > Flashcards

Flashcards in Tricalcium Silicate Cements as Dental Pulp Protection Materials Deck (13)
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1

Biodentine is composed of a powder and liquid; what are the powder constituents?

1. Tricalcium silicate (main core material)

2. Dicalcium silicate (2nd core material)

3. Calcium carbonate and oxide (fillers)

4. Iron oxide (shade)

5. Zirconium dioxide (radiopacifier)

2

What are the liquid constituents of Biodentine?

1. Hydrosoluble polymer - water reducing agent which has a surfactant effect

2. Calcium chloride (accelerator)

3

What is the special feature of the hydrosoluble polymer?

It's a superplasticising agent which reduces water content of the mixture while helping to retain it workability

4

What's the setting reaction for Biodentine?

1. Cement + water react = hydration reaction (hydraulic cements)

2.Calcium silicates are partially dissolved in the liquid = hydrogel of hydrated silicate

3. This precipitates on the remaining silicate particles' surface and in the space between particles

4. = decrease in material's porosity + increase in compressive strength

5. Material has hydrating tricalcium silicate cement grains surrounded by a matri of silicate hydrate, calcium hydroxide and calcium carbonate

6. Calcium carbonate acts as an nucleating site on which calcium silicate hydrates - responsible for high calcium ion release

5

What are the physical properties of Biodentine?

1. Similar compressive strength and hardness to dentine

2. Similar flexural modulus as dentine

3. High dimensional stability

4. Low fluid uptake and sorption

5. Doesn't discolour

6

How does Biodentine appear on a radiograph?

- Similar radiopacity to dentine so more difficult to discern radiographically

7

What are the biological properties of Biodentine?

- Designed to be placed on both dentine and vital pulp tissue

8

Biodentine is "Bioactive", what does this mean and what are the implications?

- Induces a biological response

- 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 material have been found in dentinal tubules

9

Biodentine is "Biocompatible", what does this mean and what are the implications?

- Low risk of pulp or tissue reaction

- pH of 8.2 (slightly alkaline), promotes inflammatory cell recruitment

- Forms a good seal and has better microleakage resistance than RMGIC

- Excellent marginal adaption to cavity

- It can bond to affected dentine - if you treat with Sodium Hypochorite then you will have improved bond strength

10

What are the indications of Biodentine?

1. Deep cavities - used as a dentine substitute

2. Reversible pulpitis - use as a dressing and then smoothed down for subsequent restoration

3. Trauma

4. Pulpotomy in primary molars

5. Perforation repair of the pulpal floor (going into the pulp)

11

Why would you use Biodetine rather than Calcium hydroxide?

1. More effective for maintaining long-term pulp vitality after indirect and direct pulp-capping

2. Higher success rate - less pulpal inflammatory response and more predictable hard dentine bridge formation than calcium hydroxide

12

Outline the clinical protocol for Biodentine

1. Tooth isolation using rubber dam

2. Prepare the cavity

3. Clear margins

4. Remove the infected dentine using a slow speed or excavator

5. Mix the material - 6 drops of water and 30 sec mix

6. Place in cavity

7. Allow to set (12 mins)

8. Leave as a dressing then smooth down for subsequent restoration

OR

Cover with resin composite or dental amalgam

9. Follow up clinically and take radiograph

13

What shouldn't you do if you're placing Biodentine?

1. Layer with GIC (reacts acid/base)

2. Only use selective etch

3. Use more than 2mm of resin composite to mask opacity

4. Don't desiccate as this will cause microleakage