Endodontic Anatomy Flashcards
Define “pulp chamber”
Portion of pulp space within the anatomic crown of the tooth.
Pulp chamber is bordered by?
- Pulp chamber roof = most coronal extent of the pulp chamber
- Pulp chamber floor = most apical extent of the pulp chamber
Define “Pulp horn”
Extension of pulp tissue into occlusal/incisal projections that follow the cusp tips.
Define “canal orifice”
Opening leading from pulp chamber into root canal
Define “root canal”
Channel in the root of tooth extending from the pulp chamber to apical foramen.
Define “accessory canal”
Any branch of the main pulp canal that connects with external surface of root.
Define “furcation canal”
Accessory canal at furcation
Define “lateral canal”
Horizontal accessory canal that branch from the coronal or middle zone.
Define “foramen” in apical anatomy
Opening at root apex
Define “apical constriction”
Narrowest portion of root canal. Usually 0.5 - 1.0 mm from foramen.
Define “apex”
End of tooth root. Not necessarily the end of the canal.
Location of “pulp chamber”
- Centered in crown of tooth.
- Reflects outline of tooth at CEJ.
Location of “root canals”
- Centered or symmetrically disturbed in roots.
- Reflects the shape of the root.
Define “law of centrality”
Outline of the pulp chamber mirrors the outer border of the tooth at the CEJ level. Pulp chamber is always centered in tooth at level of CEJ.
Define “law of symmetry 1”
Except for maxillary molars, paired orifices are equidistant from a line drawn in a mesiodistal direction through the pulp chamber floor AND unpaired orifices lie on the line.
Define “law of symmetry 2”
Except for maxillary molars, paired orifices lie on a line perpendicular to a line drawn in a mesiodistal direction through the pulp chamber floor.
Define “law of colour change”
the colour of the pulp chamber is always darker than the walls.
Define “law of orifice location 1”
Orifices are located at the junction of walls and floors
Define “law of orifice location 2”
Orifices are located at the angles in the floor-wall junction
Define “law of orifice location 3”
Orifices are located at the terminus of the root developmental fusion lines.
Maxillary central incisor has:
1 Root
1 Canal
Maxillary lateral incisor has:
1 Root
1 Canal
Maxillary canine tooth has:
1 root
1 Canal
Maxillary first premolar has:
1 or 2 Roots 2 Canals (67%)
Maxillary second premolar has:
1 or 2 Roots 2 Canals (50%)
Maxillary first molar has:
3 Roots 4 Canals (95%)
Maxillary second molar has:
3 Roots 4 Canals (80%)
Mandibular central incisor / lateral incisor has:
1 Root 2 Canals (40%) 1 Canal (60%)
Mandibular canine tooth has:
1 Root 1 Canal (94%) 2 Canals (6%)
Mandibular first premolar has:
1 Root
1 canal + 1 foramen (75%)
2 canals + 2 Foramen (20%)
Mandibular second premolar has:
1 root
1 canal + 1 foramen (85%)
2 canals + 2 foramen (10%)
Mandibular first molar has:
2 roots 4 canals (60%) 3 canals (40%)
Mandibular second molar has:
2 roots
Variable number of canals.
