Active / Passive Retainers

Active & Passive Retainers

Digitally Designed Thermoformed Retainers for Retention and Relapse Correction

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Retention Is Where Outcomes Are Preserved

Orthodontic relapse affects 30–50% of treated patients within 10 years. Our retainer service delivers orthodontist-designed digital solutions that go beyond simple retention — from passive stability to active relapse correction with progressive thermoformed trays.

What We Design

Passive Retainers

Digitally designed thermoformed retainers with optimized marginal adaptation, customized thickness, and targeted retention zones — ready-to-print STL files delivered in 48 hours.

Active Retainers

Progressive thermoformed tray sets (up to 6 stages) with integrated elastic cutouts and overcorrection — designed to correct mild to moderate relapse without full retreatment.

Passive Retainers: Digital Precision Retention

Customized design based on clinical needs, for high relapse needs (expansion, open bite…)

Production-ready STL files for immediate in-office 3D printing and thermoforming

STL files stored in your platform enable instant replacement — reprint lost or damaged retainers in minutes without lab recalls or rescanning

Active Retainers: High-Risk Relapse Prevention & Correction Without Retreatment

Active Retainers bridge the gap between passive retention and full retreatment. They offer patients a fast, affordable, and minimally invasive solution to prevent relapse.

Up to 6 sequential trays with staged tooth movements (0.2–0.3 mm per step)

Integrated elastic cutouts for intermaxillary force application

Programmed overcorrection and virtual C chain to compensate for relapse tendency

A final passive retainer matching the corrected position

Our anti relapse features :

Elastic Cutouts

Precision-designed openings (button or slit type) that enable intermaxillary elastic attachment for controlled directional forces — essential for correcting sagittal and vertical relapse patterns.

Active Root Torque

Programmed lingual or labial root movement integrated into the tray design to correct rotational relapse and optimize axial inclination — particularly important for anterior teeth stability.

Bite Ramps

Anterior palatal ramps that create controlled posterior disocclusion, helping to intrude anterior teeth and correct relapsed deep bite by redirecting occlusal forces.

Molar Bite Ramps

Posterior occlusal build-ups that provide vertical dimension control and support open bite correction by preventing posterior overeruption during anterior extrusion movements.

Virtual C Chain

Digital simulation of continuous elastic force distribution across multiple teeth — replicates the biomechanics of traditional C-chain elastics for space closure and arch consolidation without bonded attachments.

Arch Expansion

Controlled lateral widening of the dental arch through progressive tray staging (0.2–0.3 mm per step) — addresses relapsed transverse constriction with predictable force delivery and overcorrection programming.

Digital Workflow

Step 01 — Intraoral Scan

The clinician scans the current clinical situation and defines the treatment objective (passive retention or active correction).

Step 02 — Orthodontist-Led Design

Our team designs the retainer(s) with full biomechanical planning — material selection, elastic positions, movement staging, and overcorrection programming.

Step 03 — Review & Approval

The clinician reviews the digital setup, requests modifications if needed, and approves the final design.

Step 04 — Production-Ready Files in 48h

STL files are delivered ready for in-office 3D printing and thermoforming — no additional manipulation required.

Get in Touch

Ready to enhance your retention protocol with orthodontist-designed digital retainers?

📧 Email Us

Send us your questions or case details and we'll get back to you within 24 hours.

studio@sundayortho.com

📅 Schedule a Demo

Book a call to see how our digital retainer workflow integrates with your practice.

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