THE LAWS - I cant get them into my heahahaheahead

Law of symmetry

Pulp chamber law

• Canal orifices symmetrical to midline of tooth

• Mandibular posterior: Mirror symmetric system, line direct mesiodistally via center of pulp chamber floor.

• Exeption → Maxillary roots due to palatal roots. 

Law of colour change

Pulp chamber floor darker than pulp chamber walls.
- Floor: Brownish/greysih
- Walls: Yellowish, dentin

Law of orifice location

Orifice of root canals always:

Located at juncitons of walls & floor, angles in floor wall junction & at terminus of roots dev. fusion lines.

Guidelines

• Centrality: Floor & pulp chamber in center of root at CEJ level.

• Cocentricity: Pulp chamber wall always concentric to external surface level of CEJ. External root anatomy = internal pulp chamber anatomy

• CEJ: Distance from external tooth surface to pulp chamber wall is same (uniform) around CEJ