ETC 1: ANATOMY

Question 1

According to Kulild and Peters 1990, at what level do MB1 and MB2 join if they do not remain separate?

Answer 1

1-4mm from apex

Question 2

According to Kulild and Peters 1990 what percentage of 6’s have MB1 and Mb2?

Answer 2

96% vs 94%

on average 95%

Question 3

According to Kulild and Peters 1990, how do the roots of upper 6’s and 7’s form?

Answer 3

• Root develops as a bean shape following the external root anatomy.
• isth,us then forms leaving a larger MB2 and smaller MB1

Question 4

According to Kulild and Peters 1990, why is MB2 hard to fine

Answer 4

• Smallest canal
• during development the mB2 moves mesio palatally
• Often covered by dentine mound since this are is close to plural irritants e.g from an MOD restn

Question 5

According to Kulild and Peters 1990, at what distance from MB1 is MB2 found?

Answer 5

1.8mm palatally

Question 6

According to Kulild and Peters 1990, what direction is MB2 located?

Answer 6

Moves mesio palatally

Question 7

According to Kulild and Peters 1990, what shape does the access city take on?

Answer 7

Rhomboidal

Question 8

According to Kulild and Peters 1990, what is the maximal distance between MB1 and Mb2?

Answer 8

3mm

Question 9

According to Kulild and Peters 1990, how did they increase incidence of locating MB2?

Answer 9

Through careful use of access burs

Question 10

According to Kulild and Peters 1990, on what surface has more dentine thickness mesial or distal?

Answer 10

Mesially

Question 11

According to Imura et al 2005, what is the average range of MB2s in vitro?

Answer 11

51-95%

Question 12

According to Imura et al 2005, what is average for in vivo for 6’s and 7’s?

Answer 12

18-77% 6’s

9-38% 7’s

Question 13

How many teeth were used in Klilid and Peters?

Answer 13

83

Question 14

How many teeth were used in Imura?

Answer 14

72