338
Expansion screws
Special expansion screws
Three dimensional screw acc. to Steiner
Material: Stainless steel
• strengthened guides
• individually adjustable middle bar for adapting to different palatal vault curvatures
• two independently controlled movements (symmetrical transverse expansion)
• same total expansion per segment
With expansion screw key straight, small – standard.
Indication: for combined transverse and protrusion movements with Y plates
Directional arrow: printed, blue-yellow
Maximum expansion 4 x 1/4 turn REF Quantity
4.0 mm/segment = 0.35 mm/segment 602-604-10 1 piece
Three dimensional screw acc. to Bertoni – two movements (Type B)
Material: Stainless steel
• strengthened guides
• two independently controlled movements (symmetrical transverse expansion)
• same total expansion per segment
With expansion screw key straight, small – standard.
Indication: for combined transverse and protrusion movements with Y plates
Directional arrow: printed, blue-yellow
Maximum expansion 4 x 1/4 turn REF Quantity
4.0 mm/segment = 0.35 mm/segment 602-606-10 1 piece