The Morelli Fan-Type Screw 8mm is a fan-type orthodontic expansion screw rated for an 8 mm opening. Its fan geometry means the two halves of the appliance separate around a hinge rather than moving apart in parallel.
Key Features
Fan-type geometry — the halves of the appliance pivot open instead of translating in parallel
8 mm opening — rated at an 8 mm opening, with a 6 mm expansion dimension
Slim body — measuring 13 mm × 5 mm × 3 mm
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 — made in stainless steel
Technical Specifications
Material: Stainless steel
Opening: 8 mm
Expansion: 6 mm
Body Dimensions: 13 mm × 5 mm × 3 mm
Quantity: 1 piece
Purpose: Fan-type arch 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
Fan-pattern expansion where a hinged opening is planned instead of a parallel one.
Appliances with a pivot point anchored at a fixed posterior point.
Graduated transverse correction that increases along the arch.
Should the appliance open like a fan rather than in parallel?
This screw builds the hinged opening pattern straight into the mechanism.
