Root Camp Lecture 4 - Anatomy + Access of Premolars

Question 1

Which premolar?

Average length = 22 mm

Answer 1

Maxillary 1st
Mandibular 1st
Mandibular 2nd

Question 2

Which premolar?

Usually has 2 roots and 2 canals

Answer 2

Maxillary 1st

Question 3

Which premolar?

Pulp chamber:
Strong MD flattening
Elongated in BP direction

Answer 3

Maxillary 1st

Question 4

Which premolar?

Canals are mostly straight
P canal is bigger than B canal

Answer 4

Maxillary 1st

Question 5

Which premolar?

Root curvatures may occur in palatal, buccal, or distal direction

Answer 5

Maxillary 1st

Question 6

Which premolar?

Different degrees of root fusions and canals merging may occur: different shapes and extensions of isthmus areas

Answer 6

Maxillary 1st

Question 7

Which premolar?

Canals might have independent foramen, or merge into 1 major foramen

Answer 7

Maxillary 1st
Maxillary 2nd

Question 8

Which premolar?

If 1 canal: very elongated in BP direction

Answer 8

Maxillary 1st
Maxillary 2nd

Question 9

Which premolar?

If 3 roots: 2 are buccal, 1 is palatal

Answer 9

Maxillary 1st

Question 10

Which premolar?

Average length = 21 mm

Answer 10

Maxillary 2nd

Question 11

Which premolar?

Usually has 1 root and 2 canals

Answer 11

Maxillary 2nd

Question 12

Which premolar?

Circular or oval in apical third

Answer 12

Maxillary 2nd

Question 13

Which premolar?

If 2 canals: areas of isthmuses are frequently observed

Answer 13

Maxillary 2nd

Question 14

Which premolar?

Usually has 1 root and 1 canal

Answer 14

Mandibular 1st
Mandibular 2nd

Question 15

Which premolar?

Pulp chamber has a cuboid shape

Answer 15

Mandibular 1st

Question 16

Which premolar?

Roots are straight, or may have a slight distal curve

Answer 16

Mandibular 1st

Question 17

Which premolar?

Canal is oval, wide, and easy to find

Answer 17

Mandibular 1st

Question 18

Which premolar?

If 2 canals: commonly divided in the apical third

Answer 18

Mandibular 1st

Question 19

Which premolar?

May present 3 canals

Answer 19

Mandibular 1st

Question 20

Which premolar?

Anatomical variations are less frequent

Answer 20

Mandibular 2nd

Question 21

Which premolar?

Initial starting point = occlusal surface on central groove

Answer 21

Maxillary premolars

Question 22

Which premolar?

Penetration angle = parallel to long axis of tooth

Answer 22

All premolars

Question 23

Which premolar?

Penetration angle could have a slight inclination towards the palatal canal

Answer 23

Maxillary premolars

Question 24

Which premolar?

Exterior outline form = oval or elliptical

Answer 24

Maxillary premolars

Question 25

What is used to refine and smooth the walls after accessing the pulp cavity?

Answer 25

Safety-tip tapered bur

Question 26

What is a common error?

Answer 26

Mistaking the pulp chamber for the orifices (check the color of the dentin! pulp chamber floor is darker than adjacent dentin walls)

Question 27

Which premolar? Initial starting point = occlusal surface, 1/2 way up the lingual incline of the buccal cusp

Answer 27

Mandibular 1st premolar

Question 28

Which premolar? Initial starting point = occlusal surface, 1/3 way up the lingual incline of the buccal cusp

Answer 28

Mandibular 2nd premolar

Question 29

Which premolar? Exterior outline form = round

Answer 29

Mandibular premolars

Question 30

What do the following errors lead to? Inadequate penetration angle Lack of appropriate radiographic acquisition or examination Using round burs or non-safety tip burs on pulpal floor

Answer 30

Perforation

Question 31

What do the following errors lead to? Lack of anatomical knowledge or inadequate radiographic examination Improper access cavity outline Lack of experience

Answer 31

Lack of ID of canals

Question 32

What do the following errors lead to? Lack of anatomical knowledge Improper access outline Excessive use of the tapered burs

Answer 32

Overpreparation of the access cavity

Question 33

What do the following errors lead to? Lack of depth on the pulp chamber prep Pulp chamber roof not properly removed

Answer 33

Underpreparation of the access cavity

Question 34

What do the following errors lead to? Inappropriate penetration angle Excessive force on handpiece

Answer 34

Bur fracture