Internal Anatomy of Teeth Dr. Mohammad Hammad. Endodontics is a specialty of dentistry, that deals with the tooth pulp and tissues surrounding the root.

Internal Anatomy ofInternal Anatomy ofTeethTeeth

Internal Anatomy ofInternal Anatomy ofTeethTeeth

Dr. Mohammad HammadDr. Mohammad Hammad

•Endodontics is a specialty of dentistry, that deals with the tooth pulp and tissues surrounding the root of a tooth.

• Why do we need to perform root canal treatment?

(1) Irreversibly inflamed pulp (pulpitis).(2) Pulp Necrosis.

• What are the general steps of root canal treatment?

(1)Access cavity.(2)Cleaning and shaping of the canals.(3)Obturation (filling) of the canals.

• Root canal system: chamber and canals. • Root canals begins at the orifice and ends

at the apical foramen.• Most root canals are curved.• Accessory canals: small canals extending

from pulp to peridontium (horizontal, vertical, lateral or furcational).

Basic anatomy of a molar tooth

Vertucci’s canal configuration

• A root with a tapering canal and a single foramen is the exception rather than the rule.

• Type I: single canal extending from pulp chamber to the apex (1).

• Type II: Two separate canals leaving the pulp chamber but join short from the apex (2-1).

• Type III: one canal leaving the pulp chamber that divides into 2 canals then merges again to exit as one canal (1-2-1).

• Type IV: two separate canals extending from pulp chamber to apex (2).

• Type V: One canal leaving the pulp chamber and divides and exits the apex as two separate canals (1-2).

• Type VI: two separate canals leaving the pulp chamber then unite to form one canal then divides and exit as two canals (2-1-2).

• Type VII: One canal leaving the pulp chamber then divides into two canals then unite to form one canal then re-divides and exit as two canals (1-2-1-2).

• Type VIII: three separate canals leaving the pulp chamber and exit the apex (3).

Wein’s four possible canal configurations

Apical root anatomy

• Apical constriction=minor apical diameter: the narrowest part of the canal.• Apical foramen= major apical

diameter.• Cementodentinal junction. • AF not usually coincident with

anatomical apex.

Apical

constriction

Apical

foramen

1mm

Anatomical

apex

2mm