• Built-in internal safety hold prevents unwanted reverse rotation during treatment.
• Rigid metal housing ensures pure lateral force transmission without flexing.
• Clear directional arrow laser-etched onto the central body guides accurate key insertion.
• Four robust side arms allow seamless soldering or welding to orthodontic molar bands.
• Smooth internal thread action provides predictable arch gain per turn.
• Compact profile minimizes palatal soft tissue impingement for patient comfort.
• Engineered to resist deformation under high skeletal expansion forces.

The RME Screw With Safety Hold Leone is an essential component designed for fixed palatal expansion appliances. Crafted from surgical-grade stainless steel, this expansion mechanism offers high rigidity, enabling the transfer of heavy lateral forces necessary to separate the mid-palatal suture in growing patients. A primary advantage of this Leone-style design is its internal safety hold feature, which inhibits accidental unwinding or back-turning between activations. The stout solderable arms provide structural stability when joined to molar bands, preventing appliance distortion during active treatment. Each individual pack contains one expansion screw along with a dedicated activation key. Available expansion limits—including 8 mm, 9 mm, 11 mm, and 13 mm variants—allow clinicians and orthodontic technicians to select the optimal size based on individual palatal vault dimensions and transverse expansion goals.

• Material: High-grade surgical stainless steel
• Mechanism: Leone-style central thread with internal safety hold
• Indication: Rapid maxillary expansion (RME) / Hyrax-style fixed appliances
• Activation Step: 0.25 mm per quarter-turn
• Available Expansion Ranges: 8 mm, 9 mm, 11 mm, 13 mm
• Retentive Arms: Solderable stainless steel extensions
• Biocompatibility: Non-corrosive, tissue-friendly metallic body
• Sterility: Non-sterile (requires processing prior to placement)

1 Pack Contains:
• 1 × Rapid Maxillary Expansion Screw with Safety Hold
• 1 × Swivel Activation Key

Fit posterior molar bands on the master plaster model.

Adapt and contour the four metallic arms of the expansion screw against the palatal aspect of the bands.

Solder or spot-weld the connection points securely, ensuring proper midline orientation of the main body.

Clean, polish, and sterilize the finalized rapid maxillary expander before intraoral insertion.

Cement the appliance in the patient's mouth using an appropriate orthodontic band cement.

Instruct the patient or guardian on activating the screw with the key following the prescribed daily protocol.

Manufactured by: Leone S.p.A., Italy

Not Applicable