At ACAOO, we understand the functional and aesthetic concerns that arise when the lower jaw sits too far back. Jaw repositioning (mandibular advancement) treatment is an orthodontic approach designed to guide the lower jaw forward while aligning the teeth, helping improve bite balance and facial harmony.
This treatment is most commonly recommended for children and adolescents during active growth. However, selected adult treatment options may also be available depending on individual anatomy and appliance system.
What Is Jaw Repositioning (Mandibular Advancement)?
Mandibular advancement is an orthodontic treatment used to correct Class II malocclusion, where the lower jaw (mandible) is positioned behind the upper jaw.
This approach:
- Guides the lower jaw forward in a controlled manner
- Improves overbite and overjet
- Aligns teeth simultaneously
- Supports functional bite correction
- Enhances facial balance
By addressing both skeletal positioning and dental alignment together, this treatment can reduce the need for multiple phases of orthodontic care.
How Mandibular Advancement Treatment Works
Modern mandibular advancement systems typically combine two processes:
1. Controlled Jaw Guidance
Specialised appliance components gently hold the lower jaw in a forward position.
For growing patients:
- Treatment works with natural jaw development.
- Timing during growth phases can enhance effectiveness.
For selected adults:
- Certain systems allow functional repositioning depending on case suitability.
Consistent wear is essential for optimal results.
2. Simultaneous Teeth Alignment
Unlike traditional functional appliances that required separate treatment phases, modern systems can:
- Straighten teeth
- Improve bite alignment
- Support jaw positioning
All within one coordinated treatment plan.
Types of Mandibular Advancement Appliances
Multiple appliance systems are available. The specific mechanism varies by design but generally includes:
Precision Wing Systems
Interlocking components that guide the jaw forward when biting.
Occlusal Block Systems
Refined versions of traditional twin-block concepts that assist with jaw positioning and treatment stability.
Appliance systems are available from various orthodontic brands, including Invisalign, Spark, Smartee, and others. Your orthodontist will recommend the most suitable option based on your anatomy, growth stage, and treatment goals.
Who Is a Suitable Candidate?
Jaw repositioning treatment is most effective during active jaw growth; however, suitability varies by individual case.
You or your child may benefit if there is:
- Class II malocclusion
- Noticeable overbite or overjet
- Retrusive lower jaw
- Crowded or misaligned teeth
- Good oral hygiene habits
- Commitment to consistent appliance wear
For children and adolescents:
- Active growth remaining improves outcomes.
For adults:
- Suitability depends on jaw anatomy and bite severity.
A comprehensive evaluation including digital scans, clinical photographs, and cephalometric X-rays is required to determine candidacy.
When Is the Right Time to Start?
We generally recommend an orthodontic evaluation around age 7–8. This allows monitoring of jaw development and identification of the optimal timing for intervention.
The most effective window for jaw growth modification is typically during late childhood and early adolescence, particularly around peak growth phases.
However, it is never too late to improve your smile. Adult patients may still have options depending on their clinical presentation.
Wearing Guidelines for Best Results
Successful treatment relies on compliance.
We typically advise:
- Wearing the appliance 20–22 hours per day
- Removing only for meals and cleaning
- Brushing before reinserting
- Attending scheduled review appointments
Mild pressure during the initial adjustment period is common and usually resolves within a few weeks.
Can Adults Use This Treatment?
Jaw repositioning (mandibular advancement) treatment is most commonly used for children and adolescents because it works most effectively during active jaw growth.
However, adult treatment options may also be available with selected appliance systems depending on individual jaw anatomy and bite condition.
Our orthodontist will assess your specific case and discuss suitable options from a range of available appliance systems. In some adult cases, alternative orthodontic or combined treatment approaches may be recommended to achieve the best functional outcome.
How Long Does Treatment Take?
Treatment duration depends on:
- Age and growth stage
- Severity of Class II correction
- Appliance type
- Compliance
Many cases range between 12–18 months, although simpler cases may complete sooner and more complex cases may take longer.
Is Mandibular Advancement Painful?
Most patients experience mild pressure when starting treatment or when adjustments are made. This discomfort is typically temporary as the jaw adapts to its new position.
Will Retainers Be Required?
Yes. Retention is an essential part of orthodontic treatment.
Retainers help maintain:
- Bite correction
- Tooth alignment
- Jaw position stability
We provide detailed retainer instructions to protect long-term results.
Why Choose ACAOO?
At ACAOO, we focus on long-term oral health, functional bite correction, and facial balance.
When you choose us, you receive:
- Comprehensive orthodontic assessment
- Personalised treatment planning
- Access to modern appliance systems
- Ongoing support for patients and families
Our goal is to provide clear guidance so you can make informed decisions about your orthodontic care.
Book a Consultation
If you’ve noticed a lower jaw sitting back, difficulty biting, or early signs of overbite in your child, an orthodontic assessment can determine the most appropriate treatment pathway.
Book a consultation with ACAOO to learn whether jaw repositioning (mandibular advancement) treatment is right for you or your child.
FAQs
What is mandibular advancement in orthodontics?
Mandibular advancement is an orthodontic treatment used to correct a lower jaw that sits too far back (Class II malocclusion). It works by gently guiding the lower jaw forward while also aligning the teeth, helping improve bite balance and facial profile.
Can adults have mandibular advancement treatment?
Mandibular advancement is most commonly used for children and teenagers. However, selected adult patients may be suitable depending on jaw anatomy and appliance system. A clinical assessment is required to determine candidacy.
At what age is mandibular advancement most effective?
Mandibular advancement is most effective during active jaw growth, typically in late childhood and early adolescence. Treatment timing is often coordinated with growth spurts to achieve optimal skeletal correction.
Does mandibular advancement fix overbite?
Yes. Mandibular advancement is commonly used to correct overbite and excessive overjet associated with Class II malocclusion by guiding the lower jaw into a more balanced position.
How long does mandibular advancement treatment take?
Treatment duration varies depending on age, growth stage, and case complexity. Many cases range from 12 to 18 months, although some may be shorter or longer depending on individual factors.
Is mandibular advancement painful?
Most patients experience mild pressure or discomfort during the initial adjustment period. This typically improves within a few weeks as the jaw adapts to the new position.
What happens if mandibular advancement is not treated early?
If a significant Class II jaw discrepancy is not addressed during growth, treatment options in adulthood may become more limited and, in severe cases, could require more complex orthodontic or surgical intervention.
