Summary: 

• Purpose: to do a detailed investigation about root canal anatomy.
• N= 2400 permanent teeth.

Materials/Methods:

• Immediately after extraction, teeth were fixed with 10% formalin.
• Pulp was dyed by injecting hematoxylin dye using 25 gauge needle.
• Teeth were cleared.
• Samples were viewed using dissecting microscope.

Most highlighted Results: 

• Upper anteriors have 100% type I.
• Mandibular anteriors are 70-80% type I.
• MB2 is more common in MAX. 1st molar (37%) than MAX. 2nd molar (17%). While extra distal is comparable for MAN. 1st (43%), 2nd (38%). Regardless of canals configuration apically.
• 24% of the cases MAN. 1st premolar is type V. MAX. 2nd premolar 11% type IV.
• In all roots you would mostly find 1 foramen, except for MAX. 1st premolar (69%) and mesial root of MAN. 1st molar (.
• Lateral canals are more common in the apical 3rd in all teeth.
• Lateral canals at the furcation is 11% in MAX. 1st premolar and 23% in MAN. 1st molar.

Clinical significance:

• Knowing the diversity/complexity of root canal system would aid clinician predicting , diagnosing & providing higher quality treatment.