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Comparison of first accessory cone penetration after using stainless-steel and ni-ti spreaders in curved resin blocks.
Iran Endod J
November 2013
Department of Endodontic, Dental School of Islamic Azad University and Iranian Center for Endodontic Research, Tehran, Iran.
Introduction: The purpose of this study was to compare first accessory gutta-percha penetration after the use of nickel-titanium (Ni-Ti) or stainless-steel spreaders in curved resin blocks.
Materials And Methods: Forty resin blocks with 30º and 45º curvatures (20 blocks for each) were prepared and #30 master cones were placed in canals. In part one, under 20 Newton pressure, Ni-Ti or stainless-steel spreaders were placed alongside the master cone and their penetration was measured with a millimeter ruler.