•Purpose: to determine normal root canal anatomy and its variations.
•N= 4,183 teeth , 6219 roots , 7275 root canals.
•Teeth were classified according to age to 3 groups : up to 25, 35-45, over 55 years.
•Roentgenographs were taken from BL and MD direction with the cone placed 4 cm from the film.
•For multirooted teeth, roots were separated before taking roentgenograph •Viewed on negatoscope with the aid of magnifying glasses.
Most highlighted Results:
•96.9% of the cases canals were curved, 85% of them were in the apical third.
•Foramen was at and offset in 83% of the cases.
•BL diameter is often larger than MD diameter in apical 3rd of the canal . •The % of ramification in premolars were from 40-50% with the maxillary 2nd being the highest and the maxillary 1st was the lowest.
Use of RG, with the added dimension explained some of the unusual paths of the canals.