pulp canal morphology lower 6

1. Mandibular First Molar
PULP CANAL MORPHOLOGY
DR. MOHAMMAD AHSAN KALEEM

2. Introduction
 Earliest permanent posterior tooth to erupt
 Usually has two roots but occasionally three
 Two canals in the mesial and one or two
canals in the distal root
 Mesial roots are usually curved

3. Mandibular First Molar
Mostly bi rooted

4. Buccolingual Section
 Large pulp chamber that may extend well down into the root formation

5. Buccolingual Section
 Pulp horns prominent in most Mandibular first molars but the pulp horns of some mandibular molars are quite small

6. Buccolingual Section
 Pulp chamber of the mesial roots are square to rectangular
 Both Mesial canals mostly curved
 The distal root usually has one large pulp chamber, which is very wide in the buccolingual
dimension
 When two distal canals are present, they will be partially or
 completely separated by a dentinal island

7.  The pulp chambers are usually rectangular (excluding the pulp horns) and may be large
Mesiodistal Section

9. Mesiodistal Section
 Extensive secondary or reactive dentin deposition may also be seen
 The apical foramen usually appears to exit at the tip of the root
 The distal root is usually straighter and tends to be a little shorter than the curved
mesial root

10. Cervical Cross Section
 The cervical cross section of the mandibular first molar is generally quadrilateral in
form
 The pulp chamber floor has two small funnel-shaped openings into the mesial root
(one buccal and one lingual), whereas the distal aspect of the pulp chamber usually
shows a single opening that is less constricted

11. Midroot Cross Section
 The mesial root usually is somewhat kidney-shaped, with two separate canals
 Figure eight shape of the root is also very common

12. Mandibular First Molar 3D view