Case report · Clear aligners (Invisalign)
Class II division 1 adolescent treated Non-Extraction with aligners and Class II elastics and Orthopulse
A 15 -year-old with 8 mm overjet and a retrusive mandible treated during the growth spurt with aligners, and Class II elastics, avoiding fixed appliances.
- Patient
- Teen (11–20), female
- Classification
- Class II div 1
- Active treatment
- 14 months
- Published
- September 5, 2026

Presentation
Chief complaint. Patient has been in treatment with another orthodontist for almost 2 years with Invisalign with no progress and her overjet is getting worse. Prominent upper front teeth; parents preferred to avoid braces since she is a cheerleader.
Diagnosis. Skeletal Class II (ANB 6°), overjet 7 mm, deep bite, moderate upper crowding, CVM stage 3.
My goal was to reduce her excessive overjet and correct the Class II bite while respecting her family’s preference to avoid braces. She had already spent almost two years in aligner treatment with limited improvement, so I focused on revising the mechanics, attachment design, and anchorage strategy. I chose to continue with Invisalign using staged upper molar distalization and Class II elastics, with her remaining growth potential incorporated into the plan. The key was coordinating the tooth movements with adequate support to limit unwanted forward movement of the upper incisors. Patient education became an essential part of treatment. Early inconsistent elastic wear was accompanied by further flaring of the front teeth and increased overjet. I explained how moving the back teeth backward creates reciprocal forces elsewhere in the arch, and why her elastics were an important part of controlling those forces. Once she understood their purpose and wore them consistently, the overjet began to improve. Because she wanted to shorten the additional treatment after her previous experience, we included OrthoPulse as an adjunct and used a closely monitored aligner change schedule. The foundation of the correction remained the treatment plan, attachment design, staged movement, and consistent elastic wear. After 14 months, we achieved Class I molars, 2 mm overjet and overbite, and an improved profile without extractions or fixed appliances. This case highlights why successful aligner treatment depends on both the prescribed mechanics and the patient understanding how to use them.
Records
Before — Intraoral Photos
After — Intraoral Photos
Before — Lateral Ceph Radiograph
After — Lateral Ceph Radiograph
Before — Panoramic Radiograph
After — Panoramic RadiographTreatment
Objectives. Reduce overjet using Invisalign. Treatment failed previously with previous orthodontist because the ideal attachments were not placed, and elastics were not used in conjunction with molar distalization. Patient wants to use acceleration since she has already been in treatment for 2 years.
Plan. Invisalign Teen — Arch development and alignment, followed by staged sequential molar distalization with Class II elastics, supported by continued Class II elastics throughout treatment and active distalization.
Appliances and materials
- Clear aligners with with Class II elastics
- Class II elastics — 1/4" 6 oz full-time
- Orthopulse — 3 day change for aligners
Progress records


Outcome
Overjet 2mm, Class I molars, profile improved, Curve of Spee leveled, and overbite is now 2mm. Poor initial compliance until I educated her on the need to wear Class II elastics to counteract Newton's Third Law — that every force has an equal and opposite force, which is why her front teeth stuck out when she did not wear the elastics regularly initially. Once she wore them consistently, the overjet decreased rapidly. Duration: 14 Months, # of Aligners: 49, Refinement: 9 aligners, # of Visits: 13, Day Change: 3
Retention
Removable clear retainers nightly; Permanent fixed retainers U2-2 and L3-3 with retainer checks at 6 and 12 months post treatment
Case reports are shared with patient authorisation. Individual results vary.