Anterior open bite — the absence of vertical overlap between upper and lower incisors — has a reputation as a difficult malocclusion. Clear aligners have proven useful for many open bite cases, partly because of how they interact with the posterior teeth. The challenge isn't only closing the bite but keeping it closed.
Start with the cause
| Cause | Typical findings | Implications |
|---|---|---|
| Dental | Normal vertical facial proportions, under-erupted incisors | Often a good aligner case |
| Habit-related | Thumb or digit sucking, tongue thrust, anterior tongue posture | Address the habit or relapse is likely |
| Airway-related | Mouth breathing, enlarged tonsils or adenoids in children | Coordinate with medical providers |
| Skeletal | Increased lower facial height, steep mandibular plane | May need surgical correction in adults |
Evaluate the tongue at rest and during swallowing, ask about habits past and present, and assess facial proportions before deciding how much can be achieved with teeth alone.
Why aligners can help
Aligner material covers the occlusal surfaces of the posterior teeth. Many clinicians observe a relative intrusive effect on posterior teeth, sometimes described as a bite-block effect, which can allow the mandible to close slightly and reduce the open bite. Combined with planned incisor extrusion, this gives aligners two complementary ways to close the bite.
Planning the mechanics
- Posterior intrusion: planned intrusion of molars and premolars where indicated, relying on the occlusal coverage and appropriate anchorage.
- Anterior extrusion: extruding incisors requires attachments with active surfaces, because trays tend to slip over smooth crowns.
- Retraction of flared incisors: uprighting proclined incisors can help overlap increase.
- Vertical elastics: short-term anterior vertical elastics with buttons or precision cuts can support closure.
Plan overcorrection toward a positive overbite at the end of active treatment, as some rebound is common.
Relapse risk
Open bite has a higher relapse tendency than many other malocclusions, especially when tongue posture or habits persist. Closing the bite dentally without addressing the functional cause often leads to reopening.
Retention strategies
- Continue full-time retainer wear longer than usual before moving to nightly wear.
- Consider retainers that maintain posterior occlusal coverage.
- Refer for myofunctional therapy or speech therapy when tongue posture or swallowing patterns contribute.
- Monitor overbite at retention checks and intervene early if it decreases.
Set expectations clearly
Explain to patients that open bite correction depends on both the mechanics and their habits, and that long-term retention is part of the plan. Document the vertical relationship with photos at the start, at completion and during retention.
Infinity Aligner certified providers can request vertical-focused staging and a pre-submission review for open bite cases.
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