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Endodontics 2020 > Access preparation > Flashcards

Access preparation Flashcards

1
Q

What are the objectives of access openings?

A
  • 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
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2
Q

What are the basic outline forms for anterior teeth?

A

-Ovoid

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3
Q

What are the basic outline forms for bicusipids?

A

-Ovoid

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4
Q

What are the basic outline forms for maxillary molars?

A

-Triangular

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5
Q

What is the basic outline form for mandibular molars?

A

-Rhomboid

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6
Q

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

A

-Rounded triangular

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7
Q

For maxillary incisors how many canals do you find?

A

-One single canal (100%)

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8
Q

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

A

-20-40%

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9
Q

What tooth is the most difficult to access cavities?

A

-Mandibular incisors

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10
Q

The ____ canine is just smaller than the ______ canine.

A
  • Mandibular

- Maxillary

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11
Q

What percent of maxillary canine have just one canal?

A

-100%

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12
Q

What percent of mandibular canines have two canals?

A

3-6%

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13
Q

What is the shape of the maxillary premolars?

A

-Ovoid/elliptical

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14
Q

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

A

60-80%

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15
Q

What percent of maxillary 1st premolars have three canals?

A

6% (usually two canals on the facial root)

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16
Q

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

A

-80-90%

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17
Q

What percent of mandibular 1st premolars have one canal?

A

-75%

18
Q

What percent of mandibular 1st premolars have two canals?

A

-15-25%

19
Q

What percent of mandibular 1st premolars have three canals?

A

1%

20
Q

What percent of mandibular 2nd premolars have one canal?

A

85%

21
Q

What percent of mandibular 2nd premolars have two canals?

A

15%

22
Q

What tooth has the most complex root and canal anatomy?

A

-Maxillary 1st molar

23
Q

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

A

-Three roots with four canals

24
Q

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

A

-1 (100%)

25
Q

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

A

-1 (100%)

26
Q

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

A

-2 (20-80% of the time)

27
Q

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

A

2 roots with 3-4 canals

28
Q

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

A

70-80%

29
Q

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

A

-15-30%

30
Q

What is a Radix Entomolaris?

A

-3rd root on the mandibular molars

31
Q

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

A

-5-8%

32
Q

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

A

-Endo explorer

33
Q

What is the law of centrality?

A

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

34
Q

What is the law of Concentricity?

A

-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

35
Q

What is the Law of the CEJ?

A

-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

36
Q

What does the cross-sectional root shape equal?

A

-Outline of pulp space and canals

37
Q

What do pulp horns follow?

A

-Height of contour of crown

38
Q

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

A

-90% in either the distal or palatal direction

39
Q

Potential for most roots to contain two canals is where?

A

-Mandibular roots

40
Q

Which direction to cuspid roots typically curve?

A

-Facial

Endodontics 2020 (20 decks)

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