Retreatment

Question 1

what aids diagnosis of root perforation

Answer 1

microscope
electronic apex locator
persistent bleeding
radiographs

Question 2

why do RCT teeth still give symptoms

Answer 2

residual microorganisms within canal can escape to bone and PDL via lateral canals resulting in low grade inflammatory process that causes pain

Question 3

what questions should be asked prior to starting a retreatment of a RCT

Answer 3

why was it done in the 1st place
were there any procedural problems
was dental dam used
was hypochlorite used

Question 4

2 reasons for cuspal coverage after RCT

Answer 4

good coronal seal
prevention of catastrophic fracture

Question 5

what should be assessed clinically when assessing RCT teeth

Answer 5

coronal seal
remaining tooth structure
isolation possible?
mobility
perio prognosis
TTP

Question 6

what should be assessed radiographically when assessing RCT teeth

Answer 6

patency
length and quality of obturation
missed canals
crown:root ratio
pathology