Access preparation

Question 1

What are the objectives of access openings?

Answer 1

• Remove all caries
• Conserve sound tooth structure
• Unroof pulp chamber and remove all coronal pulp tissue
• Locate all canal orifices
• Establish straight or direct line access

Question 2

What are the basic outline forms for anterior teeth?

Answer 2

-Ovoid

Question 3

What are the basic outline forms for bicusipids?

Answer 3

-Ovoid

Question 4

What are the basic outline forms for maxillary molars?

Answer 4

-Triangular

Question 5

What is the basic outline form for mandibular molars?

Answer 5

-Rhomboid

Question 6

In younger individuals what does the canal appear as in a maxillary incisor?

Answer 6

-Rounded triangular

Question 7

For maxillary incisors how many canals do you find?

Answer 7

-One single canal (100%)

Question 8

What percent of mandibular incisors have the possibility of two canals?

Answer 8

-20-40%

Question 9

What tooth is the most difficult to access cavities?

Answer 9

-Mandibular incisors

Question 10

The ____ canine is just smaller than the ______ canine.

Answer 10

• Mandibular

- Maxillary

Question 11

What percent of maxillary canine have just one canal?

Answer 11

-100%

Question 12

What percent of mandibular canines have two canals?

Answer 12

3-6%

Question 13

What is the shape of the maxillary premolars?

Answer 13

-Ovoid/elliptical

Question 14

What percent of of Maxillary 1st premolar have two canals?

Answer 14

60-80%

Question 15

What percent of maxillary 1st premolars have three canals?

Answer 15

6% (usually two canals on the facial root)

Question 16

What percent of 2nd maxillary premolars have just one canal?

Answer 16

-80-90%

Question 17

What percent of mandibular 1st premolars have one canal?

Answer 17

-75%

Question 18

What percent of mandibular 1st premolars have two canals?

Answer 18

-15-25%

Question 19

What percent of mandibular 1st premolars have three canals?

Answer 19

1%

Question 20

What percent of mandibular 2nd premolars have one canal?

Answer 20

85%

Question 21

What percent of mandibular 2nd premolars have two canals?

Answer 21

15%

Question 22

What tooth has the most complex root and canal anatomy?

Answer 22

-Maxillary 1st molar

Question 23

How many roots and canals do you typically find in the maxillary 1st molar?

Answer 23

-Three roots with four canals

Question 24

How many canals do you find in the palatal root in the maxillary 1st molar?

Answer 24

-1 (100%)

Question 25

How many canals do you find in the distobuccal root in the maxillary 1st molar?

Answer 25

-1 (100%)

Question 26

How many canals do you find in the mesiobuccal root in the maxillary 1st molar?

Answer 26

-2 (20-80% of the time)

Question 27

In the mandibular 1st molar how many roots do you have and how many canals?

Answer 27

2 roots with 3-4 canals

Question 28

In the mesial root of the mandibular 1st molar what percent of the time will you see 2 canals?

Answer 28

70-80%

Question 29

In the distal root of the mandibular 1st molar what percent of the time will you see 2 canals?

Answer 29

-15-30%

Question 30

What is a Radix Entomolaris?

Answer 30

-3rd root on the mandibular molars

Question 31

The distal root in the mandibular 2nd molar will have 2 canals what percent of the time?

Answer 31

-5-8%

Question 32

What is the first instrument that you put in the opening to find the canals?

Answer 32

-Endo explorer

Question 33

What is the law of centrality?

Answer 33

-The floor of the pulp chamber is always located in the center of the tooth at the level of the CEJ

Question 34

What is the law of Concentricity?

Answer 34

-The walls of the pulp chamber are always concentric to the external surface of the tooth at the level of the CEJ that is the external root surface anatomy reflects the internal pulp chamber anatomy

Question 35

What is the Law of the CEJ?

Answer 35

-The distance from the external surface of the clinical crown to the wall of the pulp chamber is the same throughout the circumference of the tooth at the level of the CEJ, making the CEJ is the most consistent repeatable landmark for locating the position of the pulp chamber

Question 36

What does the cross-sectional root shape equal?

Answer 36

-Outline of pulp space and canals

Question 37

What do pulp horns follow?

Answer 37

-Height of contour of crown

Question 38

What percent of roots are curved and usually in which directions?

Answer 38

-90% in either the distal or palatal direction

Question 39

Potential for most roots to contain two canals is where?

Answer 39

-Mandibular roots

Question 40

Which direction to cuspid roots typically curve?

Answer 40

-Facial