Internal Anatomy, Tooth Morphology

Question 1

Is the central cavity of a tooth containing dental pulp and consists of root canal and pulp chamber

Answer 1

Pulp cavity

Question 2

It occupies the coronal portion of pulp cavity and acquired the shape according to the external form of the crown of a tooth

Answer 2

Pulp chamber

Question 3

Landmarks present occlusal to pulp chamber

Occlusal extent of pulp horn corresponds to the height of contour in young permanent teeth

Answer 3

Pulp horns

Question 4

Opening in the floo of pulp chamber leading into root canals

Answer 4

Canal orifice

Question 5

Extends from canal orifice to apical foramen

Answer 5

Root canal

Question 6

Apical part of root canal with the narrowest diameter short of apical foramina or radiographic apex

Answer 6

Apical constriction

Question 7

Main apical opening on the surface of root canal through which blood vessels enter the canal

Answer 7

Apical foramen

Question 8

Described as morning glory or hyperbolic due to its funnel shape appearance in which its diameter is almost double as the apical constriction

Answer 8

Apical foramen

Question 9

Average distance between minor and major diameter (apical constriction and foramen)

Answer 9

Young - 0.5mm
Older person - 0.67mm

Question 10

The point in the canal where cementum meets dentin

Answer 10

Cementodentinal junction

Question 11

Triangular areas of root surrounded by main canal, accessory canals and periradicular tissue

Answer 11

Apical delta

Question 12

Defined as a narrow, ribbon-shaped communication between two rot canals encompassing the pulp tissue

Answer 12

Isthmus

Question 13

How can we identify an isthmus

Answer 13

Usingg methlyene blue dye

Question 14

Has shown to be a main causative agent responsible for root canal failures. So, its always mandatory to clean, shape and fill the isthmus area by orthograde or retrograde filling of root canals

Answer 14

Isthmus

Question 15

Vertucci classification:

Single canal extends from the pulp chamber to the apex

Answer 15

Type 1
1 - 1

Question 16

Vertucci classification:

Two separate canals leave the pulp chamber and join short of the apex to form one canal

Answer 16

Type II

2 - 1

Question 17

Vertucci classification:

One canal leaves the pulp chamber and divides in to two in the root; the two then merge to exit as one canal

Answer 17

Type III

1 - 2 - 1

Question 18

Vertucci classification:

Two separate distinct canal extends from the pulp chamber to the apex

Answer 18

Type IV

2 - 2

Question 19

Vertucci classification:

One canal leaves the pulp chamber and divides short of the apex into two separate, distinct canals with separate apical foramina

Answer 19

Type V

1 - 2

Question 20

Vertucci classification:

Tw separate canals leave the pulp chamber, merge in the body of the root and redivide short of the apex to exit as two distinct canals

Answer 20

Class VI

2 - 1 - 2

Question 21

Vertucci classification:

One canal leaves the pulp chamber, divides adjacent then rejoins in the body of the root and finally redivides into two distinct canals short of the ape

Answer 21

Type VII

1 - 2 - 1 - 2

Question 22

Vertucci classification:

Three separate, distinct canals extend from the pulp chamber to the apex

Answer 22

Type VIII

3 - 3

Question 23

has three roots with three to four canals

Largest pulp chamber

Answer 23

Maxillary first molar

Question 24

Two roots with three to four canals

Answer 24

Mandibular first molar

Question 25

Defined as an endodontic coronal preparation which enables unobstructed access to the canal orifices, a straigh line access to apical foramen, complete control over instrumentation and accommodates obtuartion technique

Answer 25

Access cavity prep

Question 26

Round bur to use to gain entry into tooth structure and restorative materials

Answer 26

Diamond round bur No 2 and 4

Question 27

Types of root canal procedural errors

Answer 27

Ledge Perforation Strip perforation Zip Dentine mud

Question 28

Law of access cavity prep for locating canal orifices Floor of the pulp chamber is almost always located in the center of tooth at the level of CEJ

Answer 28

Law of centrality

Question 29

Law of access cavity prep for locating canal orifices Distance from eternal surface of clinical crown to the wall of pulp chamber is same throughout the tooth circumference at the level of CEJ

Answer 29

Law of CEJ

Question 30

Law of access cavity prep for locating canal orifices Colorado of floor of pulp chamber is darker than the cavity walls

Answer 30

Law of colo change

Question 31

Law of access cavity prep for locating canal orifices Except for max molars, canal orifices are equidistant from a line draw in mesiodistal direction throughout the floor os pulp chamber

Answer 31

Law os symmetry

Question 32

Law of access cavity prep for locating canal orifices Canal orifices are located at the junction of floor and walls and at the terminus of root development fusion lines

Answer 32

Law of orifice location

Question 33

termed as ____, when a line drawn to connect all three orifices of the maxillary first molar

Answer 33

Molar triangle