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 |