Simplifill as recommended, Thermafil, mechanical lateral and WVC (Schilder) obturation techniques created more complete obturation using gutta-percha at the 2 and 4 mm levels than cold lateral, WVC (continuous wave), and Simplifill not used as directed.

Two groups of 30 mature molars each (S and F) were instrumented with Profile .04 taper Series 29 rotary instruments. Group S molars were instrumented at 150 rpm and group F at 350 rpm. The number of fractures, deformed files, and instrumentation time were recorded for each tooth. No instrument fractures occurred in either group. In group S the mean deformation rate and instrumentation time were 1.1 deformed files and 8.0 min per molar. In group F they were 0.57 deformed files and 4.6 min per molar. Both differences were significant (p < 0.05). The results indicate that Profile .04 taper Series 29 rotary instruments should be used at 350 rpm to nearly double efficiency and halve the deformation rate, compared with 150 rpm. Because no instrument fractures occurred while instrumenting 60 mature molars, both speeds should be considered safe.

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