Background: Knowledge about the Anatomy of Root Canals is an important facror in the prognosis of Root Canal therapy .The purpose of this study is to derermine the Root Canal
Anatomy in mandibalar anterior reeth and premolars by clear and dye peneration
method.
Materials and methods:In this study, 350 human mandibular anterior teeth and mandibular and maxillary premolars(from each:50 teeth)were used to determine the number of Root Canals and accessory and lateral Canals . The examination of Root Canal systems was based on vertucci"s classification and with the method of clear and dye penetration with a little difference to compare with other researches.
Results:The frequency of type I in central,lateral incisors and cuspids averaged 84.%78and %94, type II:%10 ,%12 and%4, typeIII%2 ,%2 and%0, typeIV averaged%8 and%2. The frequency of lateral Canals in these teeth averaged %10 , %12 and %10 and accessory Canals averaged %24,%28 and%20.
The frequency of type I in mandibular premolars averaged %78 and%90,typeII%2 and%4,typeIV%6 and %4, type V averaged %14 and%2.The frequency of lateral Canals in these teeth was %34 and %28 and accessory Canals was %20 and %20.
The frequency of type I in maxillary permolars averaged %10, %54, typeII %24 and %20, type IV %4 and %24 , type V averaged %2 and %2. The frequency of lateral Canals in these teeth was %14 and %4 and accessory Canals averaged %18 and %22.
Conclusion : Our method with a little difference to compare with other researches is a good and precise way for evaluation of Root Canal Anatomy.