Endo 9 - Obturation

Question 1

What are the 4 aims of obturation

Answer 1

• Prevents bacteria and their toxins percolating into the periradicular tissues
• Seals the remaining bacteria in the root canal system in an environment that they cannot thrive
• Prevent percolation of periradicular exudate (the nutrient supply for the bacteria) into the root canal space
• Prevent reinfection of the root canal system from the coronal aspect

Question 2

What conditions should be met about the preparation of the canal before obturation

Answer 2

• Tooth must be asymptomatic
• temporary dressing must be intact
• No sinus present
• Root canal must be dry

Question 3

What materials can be used as a filling material for obturation

Answer 3

• Gutta Percha almost always

- Can use acrylic, pastes

Question 4

Why are some medicated pastes like endomethosone not recommended

Answer 4

they may contain paraformaldehyde which is cytotoxic.

Question 5

Give some examples of root canal sealers

Answer 5

• ZOE sealers
• CH sealers
• Resin sealers
• GI sealers
• Bioceramic sealers

Question 6

Describe the cold lateral condensation obturation technique

Answer 6

• Rubber dam
• Try in finger spreader and should be loose in canal to the WL
• Fit master GP to full WL, which will ideally have some tug back
• Dry canal
• Coat master GP with sealer and place to WL
• Place finger spreader 1mm from working length
• Then yeah measure accessory cones to the same length at the spreader an then take a mid fill radiograph not a master cone radiograph
• Continue until canal is filled

Question 7

What 3 things do we assess post RCT to determine how sick the root filling is

Answer 7

• Length - same as WL
• Quality of condensation = no voids
• Taper - adequate

Question 8

How do we assess if the root canal was successful

Answer 8

Radiograph shows healing at the periapical lesion and shit and the patient is asymptomatic u know