INSTRUMENTS

Question 1

a. Cross section of k-flexo and hedstrom and their respective motion of use (4M)

Answer 1

K-file

• Cross-sectional shape: rhomboid
• Motion:
  
  • ‘filing’ motions (dragging or rasping instruments against canal walls as they are withdrawn)
  • ‘Rotational’ motions (twisting instruments clockwise and counterclockwise between finger and thumb in ‘watch-winding’ or ‘Balanced Force’ motions)

H-file

• Cross-sectional shape: tear drop shape
• Motion:
  
  • Filing motion against the canal walls on the outward stroke

Question 2

Patient felt pain drinking cold and hot drinks

PA of teeth 44 and 45 given

a. Largest and broadest K file (1)

Answer 2

 ISO Size 130 (according to endo quiz)

Question 3

Patient felt pain drinking cold and hot drinks

PA of teeth 44 and 45 given

b. Active length of stainless steel file (1)

Answer 3

 16 mm