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Table 1 Screw characteristics

From: Evaluation of the stiffness characteristics of rapid palatal expander screws

Two-arm screws Max. expansion Arm (mm) Screw body size (mm) Amount of expansion per activation (mm) Lot no.
Dentaurum Variety S.P. two-arms 12 1.48 9.6 × 5 × 3 0.8 435299
Veltri Target baby REP 13 1.45 11 × 6 × 4.5 0.8 700032
Leone A 362113 two-arms 13 1.48 10 × 6 × 4.5 0.8 12032901
Four-arm screws Max. expansion Arm (mm) Screw body size (mm) Amount of expansion per activation (mm) Lot n°
Lancer Philosophy 1 10 1.55 8 × 8 × 3.5 0.8 RPE OOO440
Dentaurum Hyrax Click Medium 10 1.48 10 × 11 × 4 0.8 435361
Forestadent Anatomic Exp. Type “S” 10 1.48 12 × 7 × 3.5 0.8 48297815
Forestadent Type “S” for narrow palates 10 1.48 12 × 7 × 3.5 0.8 7399006
Forestadent Memory 10 1.48 15 × 10 × 4 0.8 14957593
Leone A 2620-10 with telescopic guides 10 1.48 14 × 11 × 4 0.8 12122001
Leone A 0630-10 with orthogonal arms 10 1.48 10 × 6 × 4.5 0.8 13011601