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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<.05).The preparation times of these 3 core foundation materials did not differ significantly from dentin for a 4 mm depth.

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 μm or Rz of 30 μm. For a 4 mm depth, preparation times for Build-It, Rebilda LC, and Ti-Core ranged from 24 to 27 seconds. The preparation times of these 3 core foundation materials did not differ significantly from dentin for a 4 mm depth. The results of Core Paste and Luxacore were significantly lower (10 and 11 seconds, P.05). Build-It (12 seconds) and Rebilda LC (10 seconds) showed greater preparation times compared to dentin, whereas Ti-Core preparation (5 seconds) was less. ANOVA revealed significantly lower Ra (5.0 μm) and Rz values (23–26 μm) after preparation of Core Paste, Luxacore, and Ti-Core than those of dentin (P