KIOS applianceresearched

Quick facts

Field	Value
ID	OA-0345
Type	habit_appliance
Category	habit_appliance
Fixed/removable	fixed
Primary function	simultaneous habit interruption and arch expansion
Related appliance	Dillingham combination expansion/habit appliance, Habit Quad Helix combination appliance, Removable anterior bite plate
Uses TADs	no

Overview

The KIOS appliance addresses the frequently co-occurring presentation of digit sucking or tongue thrust combined with maxillary constriction. By integrating a habit deterrent element with a transverse expansion mechanism in one fixed appliance, treatment can address both problems concurrently, reducing total appliance changes and treatment time. CFL's KIOS is fabricated as a custom appliance from impressions/digital scans.

Clinical & technical

Mechanism of action

The expansion component (midpalatal screw or spring) delivers continuous low-level force that separates the midpalatal suture over weeks, widening the upper arch transversely. Simultaneously, the crib or spur element projects into the palatal vault, blocking digit access and deterring tongue thrust. The combination targets a common clinical triad in growing patients: mouth breathing → maxillary constriction → compensatory low tongue posture and tongue thrust.

Indications & case selection

• Maxillary constriction (posterior crossbite or near-crossbite)

combined with digit habit or tongue thrust

• Phase 1 treatment in patients ages 6–11
• Cases where sequential treatment (expander first, then habit

appliance) would extend total treatment time

• Pediatric patients with the mouth-breathing/constriction/tongue

thrust triad

Contraindications & limitations

• Near or past skeletal maturity (limited expansion response)
• Contraindicated if patient cannot tolerate activation protocol

(expansion screw requires caregiver compliance for activation)

• Not appropriate for isolated habit cases without transverse

deficiency (over-expanding creates iatrogenic crossbite)

• Poor oral hygiene (complex fixed framework)

Design & fabrication

Components & materials

• Upper first molar bands (Band with attachments)
• Midpalatal expansion screw (Expansion screw): standard 12 mm jackscrew or

Hyrax-style palatal screw

• Bilateral palatal arms: 0.9 mm SS connecting bands to screw

housing

• Crib/spur element: 4–6 spurs (0.8 mm SS, 4–6 mm) soldered to the

anterior palatal wire section; or a continuous crib loop

• Optional labial bow: for additional incisor contact

Lab fabrication notes

Solder palatal arms from molar bands to screw housing first — confirm symmetric positioning on the model. Then solder the anterior habit element to the palatal wire, anterior to the screw mechanism. The spur/crib must not interfere with screw activation; leave 3 mm clearance between the most posterior spur and the front of the screw housing. Confirm all soldering is complete before acrylic, if any acrylic is used to support the screw housing. Document activation instructions (number of turns, frequency) on the delivery ticket.

Common variants & modifications

• KIOS with fan screw (Expansion screw): fan screw substituted for

standard jackscrew for anterior-dominant arch constriction

• KIOS with Hyrax screw: all-metal screw for improved hygiene in

KIOS framework

• KIOS + tongue bead: bead added to anterior KIOS framework for

positive tongue posture reinforcement

• KIOS + lower habit appliance: upper KIOS combined with a lower

tongue tamer (Lower Tongue Tamers) for comprehensive tongue thrust management

• Fixed crib KIOS: KIOS framework without removable acrylic; fully

wire-based construction soldered to molar bands

Sources

• [Combined Expansion and Habit Appliances —

AAPD](https://www.aapd.org/research/oral-health-policies--recommendations/)

• [Simultaneous Expansion and Habit Correction —

EJO](https://academic.oup.com/ejo)

• [Fixed Combination Appliances in Phase 1 —

AJO-DO](https://www.ajodo.org)

Research log

• 2026-06-10 — page created; CFL pricing from catalog; clinical

content from combination habit/expansion literature.