Access Preparation

Question 1

What are the general access prep shapes for teeth?

Answer 1

1-Anterior and Bicuspid: Ovoid
2-Max Molar: Triangular
3-Mand Molar: Rhomboid

Question 2

Which law says, the pulp chamber of the tooth is always located in the center of the tooth at the level of the CEJ?

Answer 2

Law of Centrality

Question 3

Which law says, the outline of the pulp chamber of a tooth is concentric to the outer boarder of the tooth at the level of the CEJ?

Answer 3

Law of Concentricity

Question 4

What is the rule of symmetry?

Answer 4

The orifices to the pulp chamber are symmetrical with respect to a line drawn in a mesial distal direction

Question 5

How many canals do Maxillary Incisors have?

Answer 5

1 canal 100% of the time

*Centrals and laterals are mostly the same

Question 6

Mandibular incisors can be the most difficult to access and have two candles how often?

Answer 6

30-40%

*Classically a triangular-ovoid shaped access

Question 7

How often do maxillary and mandibular canines have two canals respectively?

Answer 7

Maxillary Canine: Never (100% one canal)

Mandibular Canine: 3-6% with two canals

Question 8

How often do 1st maxillary premolars have multiple canals?

Answer 8

60-80% have 2

6% have 3

Question 9

How often do 2nd Max premolars have one canal?

Answer 9

80-90% one canal

Question 10

How often do 1st mandibular premolars have multiple canals?

Answer 10

• 75% one canal
• 25% two canals
• 1% three canals

Question 11

How often to 2nd mandibular premolars have two canals?

Answer 11

• 15% two canals

* 85% one canal

Question 12

Which tooth has the most complex root and canal anatomy?

Answer 12

Maxillary 1st molar

*usually 3 roots, 4 canals

Question 13

How many canals do each of the 3 roots of a 1st maxillary molar have?

Answer 13

• Palatal: 100% one canal
• Distobuccal: 100% one canal
• Mesiobuccal: 20-80% two canals

Question 14

What is characteristic of Maxillary 2nd molars?

Answer 14

• Similar root anatomy to max 1st molars
• More variation (1-4 canals)
• Roots often fused

Question 15

Mandibular 1st molars have two roots and 3-4 canals, how often to the medial and distal roots have 2 canals?

Answer 15

Mesial: 70-80% 2 canals
Distal: 25-30% two canals

Question 16

Mandibular 2nd molars are just smaller and more symmetrical than mand 1st molars and have two roots in the distal canal how often?

Answer 16

Dital root: 5-8% two canals

Question 17

____% of all roots are curved

Answer 17

90

Question 18

Which roots always have 1 canal?

Answer 18

• Maxillary Incisors (centrals and laterals)
• Max Canines
• Palatal and Distobuccal roots of Max 1st molars

Question 19

Maxillary anterios have how many canals?

Answer 19

One

Question 20

Mandibular incisors have how many canals?

Answer 20

Two canals 30-40%

Question 21

Maxillary premolars have how many canals?

Answer 21

Two canals 60-80% (1st)

One canal 80-90% (2nd)

Question 22

Mandibular premolrs have how many canals?

Answer 22

Two canals 15-25%

Question 23

Maxillary molars have how many canals?

Answer 23

Four canals 40-80% (1st)