Case report · Surgical orthodontics

Severe Skeletal Class III Correction with Invisalign and Two-Jaw Surgery

28-year-old female with severe skeletal Class III, underbite, open bite, posterior crossbites, and prognathic mandible

Patient
Adult (21+), female
Classification
Class III
Active treatment
20 months
Published
September 16, 2026
Initial Intraoral photos
Initial Intraoral photos

Presentation

Chief complaint. " I want to fix my underbite."

Diagnosis. 28-year-old female with a severe skeletal and dental Class III malocclusion characterized by a prognathic mandible, increased lower facial height, anterior open bite, and 2 mm negative overjet. She presented with posterior crossbites involving the maxillary second premolars, a maxillary dental midline shifted to the left, severely proclined maxillary incisors, and severely retroclined mandibular incisors.

Why I chose this approach

For this patient’s severe skeletal Class III bite, I chose Invisalign combined with two-jaw surgery to address both tooth alignment and the underlying jaw discrepancy. My goal was to achieve a well-balanced, functional bite while giving the patient an alternative to wearing braces throughout treatment. To make this approach possible, I developed the "Bella Smile surgical appliance" in collaboration with Felice O'Ryan. The idea grew out of our work with Kaiser’s surgical team, which required bands on the teeth for surgery. We needed a way to provide the tooth-supported attachments the surgeons required while allowing our patients to complete most of their orthodontic treatment with Invisalign. The appliance is secured to the teeth with bands and provides attachments for surgical stabilization and elastics. We typically cement it one to two weeks before surgery, coordinated with the surgical team’s planning and splint fabrication. It stays in place during early healing and is generally removed around six weeks afterward, once the patient can open comfortably and the surgeon approves. One of the reasons I value this design is that it allows us to work on the bite during recovery. When cleared by the surgeon, patients can wear vertical elastics to help the upper and lower teeth settle together, without aligner plastic covering the biting surfaces. This lets us support healing and refine the fit of the teeth during the same phase of treatment. For suitable patients, the appliance also offers an alternative to placing temporary anchorage devices, or TADs, solely for surgical support. In my previous cases, these added expense, and I occasionally encountered gum recession around their placement sites. I wanted another option that used the teeth for support and allowed elastics to help settle the bite. Patients have often told me that the appliance and elastics feel reassuring, almost like a “lovey”, because their bite feels supported during recovery. By the time we remove it, the teeth may already fit together closely, and we can scan for Invisalign refinements to complete the remaining details. We individualize interim aligner or retainer use to the postoperative tooth positions; a three-piece upper-jaw procedure may require a newly made retainer immediately afterward. Developing this appliance reflects my philosophy: give patients more options without compromising the treatment their bite requires.** For someone who needs jaw surgery but is reluctant to wear braces, this approach can make a comprehensive treatment plan feel more achievable.

Records

Initial Intraoral photosBefore — Intraoral Photos
Final PhotosAfter — Intraoral Photos
Profile InitialBefore — Profile Photo
Profile AfterAfter — Profile Photo
Initial Lateral CephBefore — Lateral Cephalometric Radiograph
Final Lateral CephAfter — Lateral Cephalometric Radiograph
Initial PanoBefore — Panoramic Radiograph
Final PanoAfter — Panoramic Radiograph

Measurements

Cephalometric values before and after treatment
MeasureNormPrePost
SNA828085
SNB808583
ANB2-62
Wits0-156
SN-MP323235
U1-SN102117107
L1-MP907984
Overjet (mm)2–3-22
Overbite (mm)2–312

Treatment

Objectives. Decompensate the maxillary and mandibular dentition for orthognathic surgery by retracting upper anterior teeth and proclining lowers, coordinate the arches and midlines, correct the skeletal Class III discrepancy and open bite, establish positive overjet and overbite, and achieve Class I canine and molar relationships with a stable functional occlusion.

Plan. Use Invisalign with micro-osteoperforations (MOPs) to accelerate treatment so she could have surgery sooner. to level, align, and presurgically decompensate the dentition. Place a surgical orthodontic appliance two weeks before surgery. Perform two-jaw orthognathic surgery with maxillary advancement and mandibular setback. Remove the surgical appliance six weeks postoperatively, rescan for Invisalign, and complete two refinements for final detailing and bite correction. Finish with bonded permanent retainers.

Appliances and materials

  • Invisalign
  • Bella Smile Surgical Appliance

Progress records

Decompensation before surgery
Bella Smile Surgical Appliance placed 2 weeks before surgery
Bonded on with composite and treatment plan to open 0.2mm space mesial and distal to the 6s for the bands.

Outcome

The maxilla was advanced and inferiorly repositioned, while the mandible was set back, increasing the mandibular plane angle by 3°. The maxillary incisors were retracted, and the mandibular incisors were slightly proclined. The patient achieved Class I molar and canine relationships with a 2 mm overjet and ideal overbite. Facial balance improved significantly, with a more convex and harmonious profile.

Retention

  • Fixed U2-2 permanent retainer
  • Fixed L3-3 permanent retainer
  • Invisalign Vivera retainers to be worn at night

Case reports are shared with patient authorisation. Individual results vary.