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MARPE Expansion + Concurrent Clear Aligner Therapy

Skeletal Expansion for Older Adolescents and Adults

When an adult has a true transverse deficiency of the upper jaw, orthodontic tooth movement alone may not adequately address the underlying skeletal problem.

MARPE—Miniscrew-Assisted Rapid Palatal Expansion—is an orthopedic technique designed to increase skeletal involvement during maxillary expansion in skeletally mature patients.

MARPE can be particularly useful for late adolescents and adults who are beyond the ideal age for conventional pediatric rapid palatal expansion but may not require, or may wish to avoid when appropriate, surgically assisted expansion.

What Is a MARPE?

MARPE stands for Miniscrew-Assisted Rapid Palatal Expander or Miniscrew-Assisted Rapid Palatal Expansion.

The appliance incorporates temporary anchorage devices (TADs), commonly called miniscrews, that engage the palatal bone.

Traditional tooth-borne expanders transmit expansion forces primarily through the teeth.

MARPE is designed to transfer a greater portion of those forces to the maxillary skeletal structures.

The objective is to obtain greater skeletal expansion with less reliance on dental tipping than would be expected from conventional tooth-borne adult expansion.

Who May Be a Candidate for MARPE?

MARPE may be considered for patients with:

  • Transverse maxillary deficiency

  • Posterior crossbite

  • Narrow maxillary skeletal width

  • Significant upper arch constriction

  • Dental compensation caused by a skeletal discrepancy

  • Significant crowding associated with transverse deficiency

  • Previous orthodontic treatment without correction of the transverse problem

  • Relapse associated with an inadequately addressed skeletal discrepancy

Not every adult with a narrow smile needs MARPE.

How MARPE Is Planned

MARPE treatment requires evaluation of both dental and skeletal anatomy.

Our diagnostic process may include:

  • CBCT imaging

  • Digital intraoral scans

  • Palatal bone evaluation

  • Maxillary transverse measurements

  • Root-position evaluation

  • Periodontal assessment

  • Occlusal analysis

  • Facial photographs

  • Airway and nasal anatomy when clinically relevant

  • Digital orthodontic treatment planning

The design and position of the MARPE appliance are important because palatal anatomy and bone availability vary significantly between patients.

What Happens During Expansion?

After the appliance is placed and stabilized with miniscrews, the expansion screw is activated according to the prescribed protocol.

As expansion progresses, separation through the maxillary suture may produce a temporary diastema, or space between the upper central incisors.

This is expected in many successful MARPE cases and does not represent the final tooth position.

After active expansion, the appliance remains in place for a stabilization/retention period while bone and surrounding tissues remodel.

Why We Combine MARPE With Clear Aligners

Skeletal expansion and orthodontic tooth movement solve two different problems.

MARPE addresses the transverse skeletal foundation.

Clear aligners address the position of the teeth and final occlusion.

Historically, these treatments were often performed sequentially: expansion first, followed by orthodontics.

With digital treatment planning, selected patients can undergo strategically coordinated clear-aligner treatment during portions of the MARPE process.

This can allow us to begin managing:

  • Dental crowding

  • Tooth rotations

  • Anterior alignment

  • Arch coordination

  • Tooth angulation

  • Diastema management

  • Final occlusion

while maintaining the skeletal expansion objectives.

Concurrent treatment does not mean that every tooth is moved immediately or that the aligners are allowed to work against the expander.

The orthodontic movements are specifically staged around the MARPE protocol.

Why Concurrent Treatment Requires Planning

When the maxilla expands, the relationship between the teeth changes.

The aligner treatment plan therefore has to anticipate:

  • Changes in arch width

  • Development of the midline diastema

  • Changes in posterior occlusion

  • The amount of expected skeletal versus dental expansion

  • Timing of specific tooth movements

  • Retention of transverse correction

  • Coordination with the lower arch

This is why MARPE and clear aligner therapy should be planned as a comprehensive treatment rather than two unrelated procedures.

MARPE vs. Traditional Adult Expansion

A tooth-borne expander can produce substantial dental movement in an adult without necessarily producing the desired skeletal change.

MARPE incorporates skeletal anchorage to increase orthopedic force delivery.

Systematic reviews evaluating MARPE in late adolescents and adults have reported both skeletal and dental transverse expansion, while also noting variability in success rates, methodology, periodontal effects, and overall quality of available evidence.

MARPE vs. Surgically Assisted Expansion

MARPE does not eliminate the need for surgical expansion in every adult.

Factors affecting treatment selection include:

  • Skeletal maturity

  • Degree of transverse deficiency

  • Suture morphology

  • Craniofacial anatomy

  • Palatal bone availability

  • Age

  • Periodontal anatomy

  • Previous orthodontic treatment

  • Treatment goals

Patients with more advanced skeletal resistance or significant craniofacial discrepancies may require surgically assisted treatment.

MARPE and Nasal Anatomy

Because the maxilla contributes to the nasal cavity, skeletal expansion can also produce changes within the nasomaxillary complex.

Research has reported changes in nasal cavity dimensions following MARPE.

Some patients subjectively report improved nasal breathing; however, MARPE should not be presented as a guaranteed treatment for nasal obstruction or obstructive sleep apnea.

Patients with sleep-disordered breathing require appropriate diagnosis and interdisciplinary management.

Our MARPE Workflow

Treatment typically involves:

1. Comprehensive examination

2. CBCT + digital scan

3. Skeletal and periodontal analysis

4. Digital MARPE planning

5. Appliance fabrication

6. MARPE placement

7. Prescribed activation

8. Monitoring of skeletal and dental response

9. Coordinated clear-aligner therapy when indicated

10. Stabilization and retention

11. Final orthodontic refinement

Digital MARPE Treatment

Modern MARPE treatment has advanced considerably through CBCT-guided planning, digital appliance design, and specialized orthodontic laboratories.

Our treatment planning incorporates concepts and workflows used by laboratories and clinicians focused specifically on MARPE, including Partners Dental Solutions, as well as current MARPE research and continuing education.

The objective is to determine where expansion is needed, how much should be skeletal versus dental, and how orthodontic tooth movement should be coordinated with that change.

 

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