Case report · Aligners + acceleration
Severe Overjet- Extraction recommended by all- Treated Non-Extraction
33-year old female presents with a full Cusp Class II malocclusion with 9mm overjet and 30% overbite. Slight recession present on the left molars and premolars.
- Patient
- Adult (21+), female
- Classification
- Class II div 1
- Active treatment
- 18 months
- Published
- September 7, 2026

Presentation
Chief complaint. "I want to decrease my overjet."
Diagnosis. Full Cusp Class II division 1 Malocclusion with a 9mm overjet and 3mm overbite. Hypodivergent mandibular plane angle and Skeletal deep bite with proclined upper and lower incisors, All third molars have been previously extracted.
My goal was to reduce her 9 mm overjet and correct the full cusp Class II bite while opening her skeletal deep bite. Her hypodivergent facial pattern was an important reason I chose treatment without additional extractions. In this patient, I was concerned that extracting upper premolars could make it more challenging to maintain closure of the extraction spaces over time. I also wanted to use mechanics that supported bite opening. Sequential molar distalization combined with planned posterior extrusion fit those objectives. Her third molars had already been removed, and I planned to move the upper teeth backward within the available supporting bone. Using Invisalign, I distalized the second molars first, followed by the first molars, premolars, and anterior teeth. This created room to retract the upper incisors and reduce the overjet. At the same time, I planned posterior extrusion and lower anterior intrusion to open the deep bite and increase lower facial height. Because the excessive overjet prevented effective contact with bite turbos behind the upper incisors, I initially placed them behind the upper canines. Class II elastics supported the correction, while controlling the already proclined lower incisors remained a priority. Their measured inclination stayed unchanged as the overjet decreased from 9 mm to 2 mm. This approach addressed both the excessive overjet and the deep bite without additional extractions. Fixed retainers and nighttime Vivera retainers with bite ramps were used to help maintain alignment and bite opening.
Records
Before — Intraoral Photos
After — Intraoral Photos
Before — Lateral Ceph Radiograph
After — Lateral Ceph Radiograph
Before — Panoramic Radiograph
After — Panoramic RadiographMeasurements
| Measure | Norm | Pre | Post |
|---|---|---|---|
| SNA | 82 | 80 | 80 |
| SNB | 80 | 78 | 77 |
| ANB | 2 | 2 | 3 |
| Wits | 0 | 5 | -2 |
| SN-MP | 32 | 23 | 29 |
| U1-SN | 102 | 101 | 93 |
| L1-MP | 90 | 101 | 101 |
| Overjet (mm) | 2–3 | 9 | 2 |
| Overbite (mm) | 2–3 | 3 | 2 |
Treatment
Objectives. Treat non-extraction and distalized all the teeth back to wear the wisdom teeth used to be. Open Bite and increase lower face height and improve skeletal deep bite
Plan. Using Invisalign, we bonded bite turbos on the lingual of the upper canines to open the bite. We then sequentially distalized the upper second molars, followed by the first molars, then premolars, and then the upper canine to canine. Plan is to extrude the posterior teeth to level the Curve of Spee as you distalize, and intrude the lower anteriors. Bond buttons on the U3s with cutouts, and buttons on the mesial of the L6s. Place virtual bonded bite ramps on the U2-2.
Appliances and materials
- Invisalign — Bonded bite turbos on the U3s since the overjet is too severe to bond behind the U1s or U2s
- Class II elastics — Clear buttons bonded on the U3s with a large attachment to counteract rotations and metal button on the mesial of the L6s with attachment on the distal.
- Vpro5 — 7 day aligner change
Progress records

Outcome
Distalized upper molar and retract upper incisors. Intruded lower incisor and extruded lower molar to open the vertical. Duration: 18 months # of Aligners: 61, Refinements: 15 aligners, Number of Visits: 11,Aligner Change: 7 days
Retention
Fixed permanent retainer U2-2 and L3-3 and Invisalign Vivera Retainers to be worn at night with bite ramps built in to help maintain bite opening
Case reports are shared with patient authorisation. Individual results vary.