Session 6

Question 1

What do protaper size-matched cones complement?

Answer 1

• Complement file size and shape

Question 2

What do protaper size matched cones leave very little space for?

Answer 2

• Leave very little space for accessory cones

is this a single point obturation technique?

Question 3

What are the materials/equipment for the size-matched/cold lateral compaction technique? (3)

Answer 3

• GP points
• Paper points (corresponding)
• Finger spreaders

Question 4

Why do we use paper points?

Answer 4

• To ensure canal is dry before obturation begins

Question 5

Why do we lock tweezers at WL on the GP cone?

Answer 5

• Small indentation with the tweezers allows us to recognise we have placed it to the corrected working length

Question 6

What is one problem with size matched cones?

Answer 6

• The cone should fit snugly
• One problem with the size matched cones is that sometimes you can get tug back from the more coronal portion of the root canal but if we have determined our apical gauging appropriately then this should not be an issue we should not end up with a loose fit apically

Question 7

If the master GP cone is a poor fit what do we need to do?

Answer 7

• If the cone doesn’t go to CWL and it is short then we need to think that it is possible there is debris compacted in the space or that we haven’t completed debridement effectively so we might need to go back and modify the preparation
• If the cone is slightly too long this would suggest that the cone is slipping beyond the CWL then it is appropriate that we can snip the end of the GP Cone by the corresponding amount that the GP cone is long
• Should not use scissors as this actually squashes the tip of the GP so we should use a scalpel blade

Question 8

Multi-rooted obturation can create some problems for access during obturation so it can be beneficial to treat one root at a time. What is the exception to this suggestion?

Answer 8

• UNLESS the roots are fused

Question 9

How might we carry out multi-rooted obturation with fused roots?

Answer 9

• In a RCS if 2 canals lie in a single root and there is the possibility that they are fused together we need to navigate our way through this process
• This will often mean that we put our master cone in 1 canal and place master cone in second canal and need to establish if they both go to length or if one goes to length and one doesn’t if one doesn’t we then withdraw the one that goes to length and see if the other one will go to length
• This tends to give us an idea of the level of interaction of the root canals
• If they interact then we need to manage this we will have a primary and a secondary canal - we would place the master cone in the primary
• We cut or shorten the master cone through the secondary
• Then can go ahead and use our accessory cones

Question 10

We must remove excess GP. Where should we remove this to?

Answer 10

• Cut GP back to the level of the orifice