Class II · Mandibular advancement

Mandibular advancement design.
Protocol-based. Print-ready.

Mandibular advancement trays, thermoformed. A thin, clear, easy-to-remake functional appliance for growing and non-growing patients.

Runs in your browser. Nothing to install.

Start your free trial → Book a demo

How it works

Five steps,
in a few minutes.

  1. 01

    Upload the scans

    Upper and lower arches, any scanner.

  2. 02

    Align teeth (or not)

    With aligners, or twin block only.

  3. 03

    Construction bite

    Advancement and opening, in mm.

  4. 04

    Block placement

    Automatic, then adjustable.

  5. 05

    Print and thermoform

    In-house or at your partner lab.

Construction bite.

The mandible rotates around an estimated hinge axis: you set advancement, opening and lateral shift, the app reads the opening angle.

Occlusal blocks
automatically placed.

Lower blocks on the premolars, upper blocks on the molars, placed on Apply, adjustable to your preference.

Static or dynamic,
per aligner.

In the aligner, the advancement is either constant over a range of aligners, or spread over the steps.

Biomechanics

Mandibular advancement, in six notions.

What the literature says about the aligner, the twin block and the mandible. One or two sentences per notion, with its source.

01

Aligner or twin block

Across 9 studies and 465 patients, aligner advancement and the twin block gave the same SNA, SNB and ANB changes; the aligner reduced the overjet 0.46 mm more and proclined the lower incisors 0.9° less.

Huang et al., BMC Oral Health 2026 · Sohn et al., Korean J Orthod 2026.
02

Lower incisor control

Lower incisors moved back with aligner advancement and forward with the twin block and the Herbst, in 63 patients. With Class II elastics instead of blocks, they proclined 5.3°.

Wu et al., BMC Oral Health 2023 · Patel et al., Angle Orthod 2026.
03

Mandibular length

Co-Gn grew 8.4 mm with the twin block and 8.3 mm with aligner advancement; the soft-tissue chin advanced 3.0 mm against 0.9. Two thirds of controlled samples gained more than 2 mm over the untreated.

Lombardo et al., J Orofac Orthop 2024 · Cozza et al., Am J Orthod Dentofacial Orthop 2006.
04

Timing

Prepubertal patients (CVM2) showed dentoalveolar effects, pubertal patients (CVM3) skeletal effects, Co-Gn 5.8 mm a year. Started at the pubertal peak, the twin block added 4.75 mm a year of mandibular length, against 1.88 before.

Ravera et al., Eur J Paediatr Dent 2021 · Baccetti et al., Am J Orthod Dentofacial Orthop 2000.
05

Dentoalveolar share

70 to 80 % of the overjet correction is dentoalveolar, the skeletal change 1 to 2 mm. Against no treatment, removable functional appliances reduced the overjet by 4.6 mm and ANB by 2.4°.

Salloum et al., Dental Update 2021 · Batista et al., Cochrane Database Syst Rev 2018.
06

Wear, comfort and joint

The twin block was more noticeable (70 % against 25 %) and broke more often (50 % against 22 %) than the aligner version, in 68 patients. Across 18 studies, functional advancement did not increase joint symptoms.

Zybutz et al., Angle Orthod 2021 · Ding et al., BMC Oral Health 2022.

FAQ

Common questions about mandibular advancement.

No. Three components, each from a protocol with predefined settings, adjusted with its own controls: advancement, opening, ramp angle, gizmo. Nothing is drawn by hand. The 30-minute onboarding is enough for your first case.
Both, from the same construction bite. In the aligner, the blocks are thermoformed with the aligner and the advancement is static or dynamic over the range of steps. Standalone, the thermoformed twin block is made on the printed models, one appliance per advancement step.
Advancement, opening and lateral shift in 0.5 mm steps, everything at 0 until you decide. The mandible rotates around a hinge axis estimated from the Bonwill triangle and the Balkwill angle, and the app displays the opening angle.
Yes. Ramp angle in degrees, each block moved alone with the gizmo. Each side reads the ramp contact and engagement in mm, and a block that hits an opposing tooth turns red.
Upper and lower print-ready models with the blocks welded in and the case ID engraved, the trim line as .pts and a 3D link to check before fabrication. You print in-house or at your partner lab, thermoform one sheet per model and trim on the line.

Design your first
advancement case.

Start your free trial. 30-minute live onboarding included, we design your first case with you.

Start your free trial → Book a demo

Contact

studio@sundayortho.com

Reply within one business day