In 1976 Walton concluded that tapering the canal is important for 3 major reasons...

[MHOWAIT]

1) Permits better debridement of the apical preparation
2) Reduces over instrumentation
3) Improve the ability to Obturate

[Khaled Balto]

Cool stuff from Ric Walton...It is amazing that he knew that in 1976...and now we know it for real....this is ++++ for greater taper preperation in step down manner