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. 2020 Apr 19;13(8):1921. doi: 10.3390/ma13081921

Table 1.

Study groups and design characteristics of the surgical drills.

SS-SB Group DLCC-SB Group DLCC-TB Group
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(A) Initial drill: 1.5–2 mm ∅, tip angle 30° and 3 cutting edges; (B) pilot drill: 2 mm ∅, tip angle 120° and 2 cutting edges; (C) progressive drill: 3 mm ∅, 120° tip angle and 4 cutting edges; (D) final drill: 3.3 mm ∅, 120° tip angle and 4 cutting edges(∅: diameter).