الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
The purpose of this study was to assess the topographical characteristics and metallographic ructure of RaCe Ni - Ti rotary instruments after mechanical preparation and sterilization cycles . A total of fifty RaCe rotary instruments were used ; 5 intact files represented the control Group I. Groups II, III and IV were divided equally into fifteen files each.