Results The average preparation times for dentin were 7 seconds for a 2 mm preparation depth and 22 seconds for a 4 mm depth with an average Ra of 5.4 um or Rz of 30 um. For a 4 mm depth, preparation times for Build-It, Rebilda LC, and Ti-Core ranged from 24 to 27 seconds.ANOVA revealed significantly lower Ra (5.0 um) and Rz values (23-26 um) after preparation of Core Paste, Luxacore, and Ti-Core than those of dentin (P