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Removable Screw Orthodontic Expander

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KT Trilink

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Product Description

Product Overview

Removable Screw Orthodontic Expander – A maxillary orthodontic appliance that generates transverse expansion force through a central expansion screw. By periodically turning the screw, it gradually opens the midpalatal suture or expands the dental arch width, creating space for crowded teeth, correcting posterior crossbite, and improving occlusal relationships. The appliance is fabricated from medical‑grade stainless steel and fixed to the maxillary bilateral posterior teeth via bands or cast full crowns, ensuring stable and reliable retention. It is indicated for maxillary transverse deficiency, posterior crossbite, and mild dental crowding in mixed or early permanent dentition.

Removable Screw Orthodontic Expander

Medical‑Grade Stainless Steel Precision Expansion Screw, Hyrax/Haas Types Available, Ideal for Maxillary Skeletal Expansion in Mixed/Dentition Early Stage

Precision Expansion Screw

High‑precision stainless steel screw with smooth rotation

The expansion per turn is precisely controllable, supporting long‑term, stable force application.

Rapid Midpalatal Suture Opening

opened within 2–4 weeks

By periodically turning the screw, the midpalatal suture is opened within 2–4 weeks, achieving skeletal expansion.

Stable Retention

Fixed to the maxillary bilateral posterior teeth via bands or full crowns, the appliance cannot be removed by the patient, ensuring high compliance.

Robust Soldering

The stainless steel framework is securely soldered to the bands or crowns, providing a stable structure that resists deformation or fracture.

Product photos

Product Specifications

Product Name	Bleaching Tray
Brand	KT trilink dental
Main Body Material	Medical‑grade stainless steel / Cobalt‑chromium alloy
Expansion Screw Material	Medical‑grade stainless steel (precision thread)
Band Material	Medical‑grade stainless steel band / Cast metal full crown
Thread Type	Precision fine thread / Standard coarse thread
Expansion per ¼ Turn	Approximately 0.2 – 0.25 mm
Total Screw Travel	Approximately 10 – 14 mm (varies by model)
Indicated Tooth Positions	Maxillary first premolar / First permanent molar
Retention Method	Band cementation / Full crown cementation
Fabrication Method	Hand soldering / Precision casting

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Types of Screw Expanders

Type	Structural Features	Clinical Application
Hyrax‑type Expander	Stainless steel framework with central expansion screw, band‑retained	Most commonly used; suitable for the majority of maxillary constriction cases
Haas‑type Expander	Bands with extensions soldered to the palate, resin coverage over the screw area	More pronounced skeletal expansion effect; indicated for more severe cases
Cast Full Crown Expander	Preformed metal full crowns replacing bands, with framework and screw soldered	Cases with extensive caries on abutment teeth or where band retention is compromised
Removable Expander	Acrylic base with expansion screw and clasps	Mild expansion cases requiring concurrent tooth movement

Fabrication Workflow

Clinical evaluation

Assess maxillary transverse width and the degree of posterior crossbite to confirm indications for expansion.

Impression taking

Take maxillary and mandibular impressions, and record the occlusal relationship.

Design and fabrication

Design the expander framework on the model → Solder the framework and screw → Finish and polish.

Clinical try‑in

Try in the appliance intraorally to check band/full crown adaptation, the distance between the framework and the palate, and screw operability.

Cementation

Cement the appliance to the abutment teeth using glass ionomer or resin cement.

Activation instruction

Instruct the patient's caregiver on how to turn the screw, and provide activation frequency (typically ¼ turn per day) and precautionary measures.

Regular follow‑up

Schedule weekly or bi‑weekly follow‑ups to monitor expansion progress and remaining screw travel until expansion is completed.

Retention phase

After expansion is completed, maintain the appliance in place for 3–6 months to allow new bone formation to stabilize, then remove it.

Indications

Maxillary transverse deficiency

Unilateral or bilateral posterior crossbite

Mild to moderate maxillary dental crowding

Skeletal expansion in mixed or early permanent dentition

Adjunctive treatment for functional mandibular deviation

Pre‑surgical expansion for combined orthodontic‑orthognathic treatment

FAQ

How often do I need to turn the screw?

Usually, just a quarter turn (90°) once a day. Your clinician will give you the exact schedule based on your age and how much expansion is needed. In some cases, they may ask you to turn it twice a day or every other day.

Will it hurt during expansion?

What happens after expansion is done?

How do I know if we've expanded enough?

Which type of expander is better – band or full crown?