canal preparation

Question 1

what file movement does the modified double flare technique use

Answer 1

balanced force

Question 2

balanced force technique

Answer 2

1/4 turn clockwise followed by 1/2 turn anti-clockwise with continues apical pressure

Question 3

watch winding technique

Answer 3

back and forward oscillation of 30-60 degrees with light apical pressure

Question 4

objectives of root canal irrigants (3)

Answer 4

remove smear layer
flush out debris
lubricate instruments
dissolve organic debris
disinfection

Question 5

name 2 methods of determining corrected working length

Answer 5

• electronic apex locator
• radiograph with file to EWL (CWL should be 1mm from radiographic apex)

Question 6

endodontic canal preparation design objectives

Answer 6

• create a continuously tapering funnel shape
• maintain apical foramen in original position
• keep apical opening as small as possible

Question 7

what 4 chemicals can be used for irrigation

Answer 7

sodium hypochlorite
EDTA
chlorhexidine
citric acid

Question 8

hermetic seal

Answer 8

water tight and air tight
ideally obturation should create a hermetic seal