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Conservation > Obturation > Flashcards

Obturation Flashcards

1
Q

What is the aim of obturation?

A

Seal the cleaned, shaped and disinfected RCS with an inert biocompatible filling and to prevent reinfection

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2
Q

Name 2 objectives of obturation

A
  1. Prevent any residual contamination within RCS entering the periapical tissues
  2. Prevent recontamination of the RCS via the oral cavity
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3
Q

Name 6 ideal properties of a core filling material

A
  1. Easily introduced into RCS and not shrink on insertion
  2. Seal canal laterally and apically
  3. Bacteriostatic
  4. Radio-opaque
  5. Insoluble in tissue fluids
  6. Should not stain or irritate tissues
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4
Q

Name 6 ideal properties of a sealer

A
  1. Should exhibit tackiness when mixed to provide good adhesion to canal when set
  2. Radio-opaque
  3. Not shrink on setting
  4. Bacteriostatic
  5. Should not stain or irritate tooth structures and tissues
  6. Soluble in common solvent if necessary to remove it
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5
Q

What is the core material of choice?

A

Gutta-Percha

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6
Q

What 4 components make up GP?

A
  1. Inert rubber material incorporated with zinc oxide
  2. Waxes
  3. Metal salts
  4. Colouring agents
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7
Q

Name 3 root canal sealers

A
  1. Zinc Oxide Eugenol (Tubliseal)
  2. Calcium Hydroxide (Apexit)
  3. Resin based (AH Plus)
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8
Q

Describe 3 classifications of bioceramics

A

Bioinert - Non-interactive with biological systems
Bioactive - Durable tissues which undergo interfacial interactions with surrounding tissues
Biodegradable - Soluble which are eventually replaced or incorporated into tissue

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9
Q

Describe the classification of bioceramic sealers

A
  • Contain calcium silicate so are bioactive

- Chemically bonds to dentine with hydroxyapatite formation and does not cause inflammation apically

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10
Q

Name 6 properties of bioceramic sealers

A
  1. Biocompatible and osteogenic
  2. Chemical bond of sealer to dentine
  3. Highly radio-opaque
  4. Hydrophilic
  5. User friendly
  6. Highly antimicrobial
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11
Q

What is the major drawback of bioceramics?

A

Can be difficult to remove for re-RCT

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12
Q

Name 6 methods of obturation

A
  1. Single point
  2. Cold lateral condensation
  3. Warm lateral compaction
  4. Warm vertical compaction
  5. Carrier based techniques
  6. Apical barrier (bioactive MTA)
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13
Q

Describe the process of the insertion of master GP into a root canal

A
  • Select master GP to match finishing file
  • Insert MGP to full WL, check for tug-back and can take trial radiograph to ensure going to WL
  • Dry canal with paper points
  • Coat MGP in sealer and carry into canal to full WL
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14
Q

Describe the process of filling canal using finger spreaders

A
  • Finger spreader placed alongside MGP in canal
  • Select accessory point and coat with sealer and insert in the canal immediately following spreader withdrawal
  • Repeat sequence using larger spreaders and AGP until coronal third of canal is filled
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15
Q

What is the final step of cold lateral condensation following insertion of AGP?

A

Remove excess GP from canal orifice with heater excavator and firmly compact remaining GP in orifice

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16
Q

Describe 4 components of a successful obturation

A
  1. Entire WL obturated
  2. No voids in filling
  3. No overfilling into peri-radicular tissues
  4. Matches original tooth morphology
17
Q

What is the most common method of evaluating an obturation?

A

Radiographic assessment

18
Q

Describe 3 criteria of radiographic assessment of obturation

A

Length - Will be at prepared WL (~1m from apex)
Density - Radiographic appearance of dense homogenous three dimension obturation without voids
Shape - Reflect the shape of the preparation i.e tapered

19
Q

Name 2 important aspects of a coronal seal

A
  1. Coverage of GP points

2. Cuspal protection (molars and premolars)

20
Q

Name 2 common coronal seals

A
  1. RMGI Cement (Vitrbond)

2. Smart Dentine Replacement (SDR)

21
Q

When is vitrbond placed?

A

Thin layer placed on floor of the pulp chamber to seal root filling prior to placement of final restoration

22
Q

Describe how SDR works as a coronal seal

A
  • SDR is bulk-fill flowable composite base in 4mm increments
  • Etch and bond is placed SDR is applied up to 4mm over root filling
  • Remove tubliseal from cavity walls as contains eugenol which will affect bond
  • 2mm left on top for capping layer of universal composite material

Conservation (27 decks)

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