ANATOMY OF PULP CHAMBER FLOOR

By Dr. Vishaal Bhat on Tuesday 1 February 2011 with 0 comments



A study has been done by Paul Krasner and Henry J Rankow where they used 500 extracted maxillary and mandibular anterior premolar and molars. 400 teeth were cut off horizontally at level of CEJ, 50 teeth – sectioned buccolingually through crown and roots, 50 teeth – sectioned mesiodistally through crown and roots.


Following observations were noted:
1)    Pulp chamber has always in the center of the tooth at the level of CEJ
2)    Walls of the pulp chamber were always concentric to the external surface of the crown at the level of the CEJ.
3)    The distance from the external surface of the clinical crown to the wall of the pulp chamber was the same through out the circumference of tooth at the level of the CEJ.

These observations were consistent enough that several laws could be formulated. 
Law of centrality: The floor of the pulp chamber is always located in the center of the tooth at the level of CEJ.
Law of concentricity: The walls of the pulp chamber are always concentric to the external surface of the tooth at the level of the CEJ.
Law of CEJ: CEJ is most consistent, repeatable landmark for locating the position of the pulp chamber.



Following observations were noted relative to all the teeth except maxillary molars.
1)    If a line is drawn in a mesial-distal direction across the center of the floor of the pulp chamber, the orifices of the canals on either side of the line are equidistant.
2)    If a line is drawn in mesial distal direction across the center of the floor of the pulp chamber, the orifices of the canals on either side are perpendicular to it.


Several laws regarding pulp chamber floor that can be proposed.
Law of symmetry 1: Except for maxillary molars, the orifices of the canals are equidistant from a line drawn in a mesial distal direction through the pulp chamber floor.
Law of symmetry 2: Except for the maxillary molars, the orifices of the canals lie on a line perpendicular to a line drawn in mesial distal direction across the center of the floor of the pulp chamber.

Relationship on the pulp chamber floor:
1)    Floor of pulp chamber is always a darker color than the surrounding dentinal walls.   
2)    This color difference creates a distinct junction where the walls and the floor of the pulp chamber meets.
3)    The orifices of the root canals are always located at the junction of the walls and floor.
4)    The orifices of the root canals are located at the angles in the floor wall junction.
5)    The orifice lay at the terminus of developmental root fusion lines (DRFL)
6)    DRFL are darker than the floor color
7)    Reparative dentin or calcification are lighter than pulp chamber floor and often obscure it and the orifices  


Law of color change: Color of the pulp chamber floor is always darker than the walls.
Law of orifice location 1: The orifices of the root canals are always located at the junction of the walls and floor.
Law of orifice location 2: The orifices of the root canals are always located at the angles formed at the junction of the walls and the floor
Law of orifice location 3: The orifice of the root canals are located at the termination of developmental root  fusion line.

Category: Conservative and Endodontics Notes , Conservative Dentistry Notes , Endodontics Notes

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