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Setting the bur is a simple step in installing a high speed bur in a handpiece which causes the chuck to grip the bur more securely. It requires putting slight pressure on the end of the bur after releasing the button on the handpiece.
When we put a high speed attachment in the Assistina and ran it for one cycle there was no evidence that the oil had reached the head of the handpiece. It took at least 2 cycles to adequately lubricate and clean the attachment.