The Morelli Sectional Screw 6.5mm is a unilateral orthodontic expansion screw rated for a 6.5 mm opening. The manufacturer builds it to move a single side of the appliance, on a frame 13 mm long.
Key Features
One-sided expansion — classified by the manufacturer as a unilateral screw, delivering movement to one segment
6.5 mm opening — rated at a 6.5 mm opening, with a 4 mm expansion dimension
Sturdy frame — a 13 mm × 8 mm × 3.5 mm body
Anti-reverse mechanism — the mechanism keeps the screw from turning back on its own once it has been advanced
Secure locking system — the position reached after each activation is held in place
Stainless steel build — produced in stainless steel
Technical Specifications
Material: Stainless steel
Opening: 6.5 mm
Expansion: 4 mm
Body Dimensions: 13 mm × 8 mm × 3.5 mm
Quantity: 1 piece
Purpose: Unilateral, segment-limited expansion in orthodontic appliances
Certifications: FDA Approved, CE Approved, ISO 9001:2015, ISO 13485:2016
Country of Manufacture: Brazil
Package Includes: 1 expansion screw
Clinical Applications
Segmental expansion planned for one side of the dental arch.
Unilateral crossbite correction in fixed or removable appliances.
Targeted space regaining over a defined group of teeth.
Does your case need movement on one side and stability on the other?
Unilateral action on a 13 mm stainless steel frame keeps segmental mechanics predictable.
