“…Immediately after the instruments of the two systems were removed from their boxes, they underwent an initial cleaning procedure, with scrubbing and sonication in a Biocleaner tray (Biodont, São Paulo, Brazil) containing Riozyme II enzyme detergent (Rioquímica, São Paulo, Brazil) for 20 min (Filippini 2003). The instruments were then stored in metal boxes identified with the group and the specimen number, and placed in envelopes for sterilization.…”