| Field | Value |
|---|---|
| ID | OA-0156 |
| Type | habit_appliance |
| Category | habit_appliance |
| Fixed/removable | fixed (preferred) or removable |
| Primary function | habit interruption (tongue thrust, thumb/finger sucking) |
| Malocclusion target | anterior open bite from tongue thrusting or digit sucking |
| Inventor | various (palatal crib concept: 1920s onward) |
| First year | 1920s |
| Period | historical / current |
| Status | current |
| Treatment duration | 6–12 months typically |
| Uses TADs | no |
A tongue crib is a habit-interrupting appliance designed to prevent the tongue from thrusting forward against the incisors (tongue thrust) or prevent a finger/thumb from reaching the palate (digit sucking). The crib consists of a wire framework (fence or grid) positioned behind the upper anterior teeth, attached either to a fixed palatal bar cemented to molar bands or to a removable plate. When the tongue presses forward (as in tongue thrust during swallowing) or a digit is inserted, it contacts the crib wires instead of reaching the teeth — over time the habit is extinguished and the anterior open bite closes spontaneously. Fixed cribs are significantly more effective than removable because they operate 24/7 without compliance.
The crib wires create a physical barrier that blocks the tongue from pressing against the upper incisors during swallowing and at rest. The anterior teeth are no longer displaced forward by tongue pressure; the ongoing natural eruption of the anterior teeth (previously inhibited by the habit) proceeds, and the open bite closes. The crib does not move teeth mechanically — it removes the causative force and allows the dentition to correct itself. Closure typically begins within 1–3 months of consistent crib wear. For digit suckers, the crib also covers the palate and prevents the finger from creating the negative pressure that makes the habit rewarding.
Anterior open bite caused by tongue thrusting; anterior open bite or upper incisor proclination from thumb/finger sucking; patients ages 6–12 (primary or mixed dentition) where the habit is preventing normal eruption; cases where behavioral modification has failed; combined tongue thrust + anterior open bite where arch remodeling is needed after habit cessation. Fixed cribs are used for patients who remove or forget removable appliances; removable cribs (Hawley with crib wire) are used for motivated patients or as a transitional option.
Not appropriate if open bite is skeletal in origin (vertical maxillary excess, mandibular rotation) rather than habit-caused. Fixed cribs may initially cause speech difficulty and increased salivation — patients require adaptation period of 1–2 weeks. Cannot be used without sufficient molar band anchorage. Removable cribs are entirely compliance-dependent and often fail for that reason.
Fixed tongue crib (most common):
premolars)
from the palatal bar behind the incisors
the lower incisors)
incisors
Removable crib:
For fixed cribs, the crib wire fence must be symmetrical and the crib length precise — too long engages the lower incisors and creates unwanted forces; too short the tongue slips over. The crib should be smooth and polished to avoid tissue irritation. Molar band fit must be precise since the appliance is cemented long-term. CFL offers: Cust Fixed Tongue Guard, Fixed Crib Appliance (pricing unlisted), Palatal Crib. The palatal crib is likely a simpler removable or lighter fixed design; the custom fixed tongue guard is the full custom version.
arch expansion.
distractor; different mechanism (positive reinforcement rather than barrier).
more comprehensive habit-breaking design.
Labs](https://odlortho.com/tongue-crib-appliance/)
Labs](https://odlortho.com/product-line/habit-breaking-appliances/)
Labs](https://ohlendorfappliancelab.com/habit-correction-appliances/)
fabrication, business notes.