Root Canal System And Access Prep

Question 1

What is the main objective of RCT?

Answer 1

To shape and clean allpulp spaces
Complete obturation of these spaces

Question 2

What is a root canal system

Answer 2

Where the pulp is located and found at the center of the tooth

Question 3

Houses the coronal portion of the pulp

Answer 3

Pulp chamber

Question 4

Located directly below the cusps

Answer 4

Pulp horn

Question 5

Found at the floor of the pulp chamber and the roof of the root canal

Answer 5

Root canal orifice

Question 6

Part of the pulp that is housed by the anatomical root

Its roof is the root canak orifice

Answer 6

Root canal

Question 7

Canals that are found at the sides of the main root canal

Answer 7

Lateral canal

Question 8

Canals found in the furcation

Answer 8

Furcation canal

Question 9

Main exit point of the pulp

Answer 9

Apical foramen

Question 10

The area occupying in between the apical foramen and accessory foramina

Answer 10

Apical delta

Question 11

Location of pulpal roof and pulpal floor

Answer 11

Pulpal roof - at the cervical third of the crown

Pulpal floor - at the cervical third of the root

Question 13

If the color of the access prep is yellowish, what portion are you still in the access prep?

Answer 13

Still in the pulpal roof. So, needs to be bur more

Question 14

If the color of the prep is blackish brown, this indicates what?

Answer 14

You are in the pulpal floor already

Question 15

In what portion of the root canal system can you see a dentinal map?

Answer 15

In the pulpal floor

Question 16

Line that connects the root canal orifices

Distinct lines that directs you to the root canal orifice

Answer 16

Dentinal map (located in pulpal floor)

Question 17

Texture of pulpal roof

Answer 17

Has no definite shape

Question 18

Texture of pulpal floor

Answer 18

Smooth and convex

Question 19

What are the methods of studying the toor canal system

Answer 19

Ground section
Histologic
Radiographic
Clearing technique
Acrylic cast/ silicone injection
Cbct

Question 20

methods of studying the root canal system

Thinning down the tooth structure longitudinally or cross section

Answer 20

Ground section

Question 21

methods of studying the root canal system

Decalcified ground section using hydrochloride acid
Thinned down using microtomes

Answer 21

Histologic

Question 23

methods of studying the root canal system

2d picture of a 3d object

Answer 23

Radiographic

Question 24

methods of studying the root canal system

Prepared with 10% HCL and the root canal system is injected with methylene blue and cleared with methyl metacrylate to make the tooth transparent

Answer 24

Clearing technique

Question 25

methods of studying the root canal system Tooth specimen is decalcified and injected with a fast-setting fluid acrylic then the tooth is split to expose the hardened impression

Answer 25

Acrylic cast/silicone injection

Question 26

methods of studying the root canal system Provides the root canal anatomy in 3d compared to radiographs which are only 2d

Answer 26

Cbct

Question 27

Factors affecting root canal morphology

Answer 27

Age Caries Developmental anomalies Irritants Attrition Abrasion Erosion Trauma Clinical procedures

Question 28

Why does rot canal system becomes constricted through age?

Answer 28

Due to the deposition of reparative dentin

Question 29

Ribbon, narrow-shaped communication between the teo canals that contain pulp tissue

Answer 29

Isthmuses (anastomoses)

Question 30

Smallest diameter of apical root anatomy

Answer 30

Apical constriction

Question 31

Type 1 vertucci classification

Answer 31

1-1

Question 32

Type 2 vertucci classification

Answer 32

2-1

Question 33

Type 3 vertucci classification

Answer 33

1-2-1

Question 34

Type 4 vertucci classification

Answer 34

2-2

Question 35

Type 5 vertucci classification

Answer 35

1-2

Question 36

Type 6 vertucci classification

Answer 36

2-1-2

Question 37

Type 7 vertucci classification

Answer 37

1-2-1-2

Question 38

Type 8 vertucci classification

Answer 38

3-3

Question 39

The opening prepared in the root to gain entrance to the root canal system for the purpose of cleaning, shaping and obturating

Answer 39

Access cavity

Question 40

Most common,y used irrigation in clinics which is also diluted with sterile water of NSS with a ratio of 1:10

Answer 40

5.25% sodium hypochlorite

Question 41

Irrigation in endo

Answer 41

Sodium hypochlorite Chlorhexidine gluconate EDTA

Question 42

The orifices of the canals are equidistant from a line drawn in a mesiodistal direction through the center of the pulpal chamber floor Except for max molars

Answer 42

Law of symmetry 1

Question 43

The orifices of the canals lie on a perpendicular line drawn in a mesiodistal direction through the center of the pulp chamber

Answer 43

Law of symmetry 2

Question 44

The color of the pulp chamber floor is always darker than the walls

Answer 44

Law of color change

Question 45

The lrifice are always located at the junction of the floor and the walls 90deg of the floor and wall 2d based on surface

Answer 45

Law of orifice location 1

Question 46

The orifices are at vertices of the floor, wall and junction 3d based on walls

Answer 46

Law of orifice location 2

Question 47

The pulp chamber of every tooth is in the center of the tooth at the level of the cej

Answer 47

Law of centrality

Question 48

Three phases of access cavity prep

Answer 48

Penetration phase Enlargement pnase Finishing phase

Question 49

Phases of access cavity prep Gaining access to the pulp chamber

Answer 49

Penetration phase

Question 50

Phases of access cavity prep De-roofing, enlarging, and smoothening the walls

Answer 50

Enlargement phase

Question 51

Phases of access cavity prep Smoothening of walls to achieve the final outline form

Answer 51

Finishing phase

Question 52

Opening in penetration phase must be ___ shaped

Answer 52

Funnel shaped

Question 54

Commonly found bacteria in retreatment cases

Answer 54

Enterococcus faecalis