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BDS2: DM > Composites: Bonding to Dentine > Flashcards

Composites: Bonding to Dentine Flashcards

1
Q

Is tooth tissue hydrophobic or hydrophilic?

A

Hydrophilic

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2
Q

Are most restorative materials hydrophobic or hydrophilic?

A

Hydrophobic

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3
Q

What adhesive bonds can occur between tooth tissue and restorative material? 3

A
  • Micromechanical
  • Molecular Entanglement
  • Chemical
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4
Q

Which bond needs to be achieved for longevity between tooth tissue and restorative material?

A

Chemical bond

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5
Q

What are 5 advantages of adhesives?

A
  • Better aesthetics
  • Conservation of tooth tissue
  • Reinforcement of weak tooth structure
  • Reduced marginal leakage
  • Reduced potential for pulp sensitivity
  • Range of techniques
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6
Q

What are the 5 ideal requirements for adhesives?

A
  • Provide high bond strength to enamel and dentine
  • Immediate and durable bond
  • Prevent ingress of bacteria
  • Safe to use
  • Simple to use
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7
Q

Composition ENAMEL structure by weight

Mineral
Organic material
Water

A

96% Mineral

1% Organic material

3% Water

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8
Q

When would you need to bond a restoration to enamel? 2

A
  • Orthodontic appliances

- Bridges

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9
Q

Comment on the surface tension of enamel compared to the adhesive resin

A
  • Surface tension of enamel is lower
  • So perfect wetting cannot take place
  • (Resin won’t flow/cover the enamel surface properly)
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10
Q

What layer covers enamel?

A

Pellicle Layer

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11
Q

How can adhesion onto an enamel surface be achieved?

A
  • Pellicle layer of enamel must be removed

- Enamel surface must be etched to raise surface tension

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12
Q

How is the pellicle layer removed and enamel etched?

A

Acid etch technique

- Involves using 30-50% PHOSPHORIC acid on the enamel surface

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13
Q

What are the 4 main effects of the acid etch technique?

A
  • INCREASED surface roughness
  • Surface energy is RAISED
  • IMPROVED wet-ability
  • Opens inner prism area for interlocking tag formation
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14
Q

What visible appearance is present when adequate etching has been achieved?

A

Enamel has a ‘FROSTY’ appearance

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15
Q

What is recommended to apply after an acid etching?

A

Low viscosity resin before placing composite

E.g. Unfilled Bis-GMA or dentine adhesive resin

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16
Q

Name 6 dental procedures where the acid-etched enamel is used for

A
  • Fissure sealing
  • Direct Composite
  • Ceramic Veneers
  • Resin Bonded bridges
  • Orthodontic brackets
  • Periodontal splinting
17
Q

Why does a restorative resin have to be adhesively bonded to dentine?

A
  • Retain restoration in the cavity

- Removed marginal gaps to stop bacterial microleakage

18
Q

Composition of DENTINE structure by weight

Inorganic Hydroxyapatite
Organic Material
Water

A

70% Inorganic HA

20% Organic Material (Hydrated Collagen)

10% Water

19
Q

What 2 things happens when dentine is cut?

A
  • Fluid is pumped through the dentine tubules giving a wet surface
  • Inorganic HA crystals are broken up, collagen stretched, torn and smeared over the cut surface
20
Q

What is the organic material of dentine mainly composed of?

A

Hydrated Collagen

21
Q

What are the 3 essential components of a dentine bonding agent?

A
  • Conditioner
  • Coupling agent
  • Sealer
22
Q

What is the role of the conditioner in a dentine bonding agent?

A

Acidic so modifies/clears smear layer

23
Q

What is the role of the coupling agent in a dentine bonding agent?

What molecule does it contain?

A

Used as a adhesive

Hydroxyethyl Methacrylate

(HEMA)

24
Q

What is the role of the sealer in the dentine bonding agent?

What agents can be used as sealers?

A

Seals the Dentine Tubules

Unfilled Bis-GMA or UDMA

25
Q

The interpenetrating layer of dentine and resin is referred to as?

A

The hybrid zone

26
Q

What are the 2 bonds found in dentine adhesion?

A
  • Micro-mechanical

- Entanglement

27
Q

Explain the bonding between the dentine tubules and coupling agent

A

Molecular entanglement with OH groups of primer

28
Q

Explain the bonding between coupling agent and the sealer

A

Methacrylate group of coupling chemically bonds to methacrylate group of sealer

29
Q

Explain the bonding between the sealer and filled-composite material

A

Methacrylate group of sealer chemically bonds to methacrylate group on filled composite material

30
Q

What will happen if there is excessive desiccation of dentine?

A

Post operative pulpal sensitivity and a poor bond

31
Q

If there is bond failure amongst dentine adhesion what may occur?

A

Pulpal inflammation leading to bacterial leakage

32
Q

What are 4 potential causes for adhesive bond breakdown?

A
  • Polymerisation shrinkage
  • Differential thermal expansion and contraction
  • Internal stresses for occlusal loading
  • Chemical Attack (Hydrolysis)

BDS2: DM (6 decks)

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