The Two-Stage Maxilla:
MARPE now, Le Fort later
Planning the sequence for adult skeletal correction
Establish palatal suture separation and skeletal width with miniscrew-assisted expansion before definitive Le Fort surgery. Learn the clinical protocol, timing, and radiographic markers that predict success in combined orthodontic-surgical treatment.
TL;DR Two-stage maxillary correction uses miniscrew-assisted rapid palatal expansion (MARPE) to establish basal skeletal width before Le Fort I osteotomy, reducing surgical complexity and improving transverse stability. Success depends on age, timing of suture separation, and coordinated surgical sequencing. This approach is most effective in patients under 50 with confirmed palatal suture separation during expansion phase.
Planning the sequence between miniscrew-assisted rapid palatal expansion and orthognathic surgery is a critical decision point in adult correction of transverse maxillary deficiency. Dr. Mark Radzhabov and the Orthodontist Mark team have developed a systematic approach to two-stage maxillary correction that places MARPE in the foundational role—establishing skeletal width and allowing the midpalatal suture to separate—before definitive Le Fort I osteotomy. This article outlines when to expand first versus when to operate, how to time activation protocols, and which radiographic signs indicate readiness for surgical advancement. Whether your patient needs transverse correction alone or combined with anteroposterior adjustment, understanding this sequencing will improve surgical outcomes and reduce relapse.
Overview: Two-Stage Maxillary Correction
sequential framework
and why it matters
The two-stage maxilla is a sequential framework that separates transverse skeletal correction from anteroposterior and vertical surgical adjustment. In growing patients, rapid palatal expansion (RPE) is standard—the tooth-borne appliance works because the midpalatal suture remains relatively unfused. In skeletally mature adults, however, the suture is heavily interdigitated, and pure orthopaedic expansion often fails without surgical assistance. Miniscrew-assisted expansion (MARPE) bypasses dental limitations by anchoring directly to bone, allowing predictable suture separation even in older patients.
The rationale for the two-stage approach is surgical efficiency and stability. When the maxilla arrives at the operating table already expanded to the target transverse width, the surgeon works within a wider surgical field, reduces the mechanical forces needed during Le Fort advancement, and decreases the risk of relapse. Additionally, achieving palatal suture separation before surgery eliminates a major point of resistance that would otherwise constrain skeletal movement during osteotomy. The orthodontist's role in stage one—completing MARPE and confirming radiographic evidence of suture separation—directly determines the feasibility and precision of stage two.
Not all adult patients require staged correction. If transverse deficiency is mild and the primary concern is anteroposterior or vertical, a single-stage Le Fort may suffice. However, when transverse width falls below the surgical norm, when the palate is severely constricted, or when the patient has a history of failed RPE in adolescence, the two-stage protocol becomes the standard of care. Dr. Mark Radzhabov emphasizes that the decision to split treatment into two phases is made at the diagnostic stage, informed by CBCT morphology, age, and the magnitude of deformity.
Assessing Candidacy:
Age, Suture Maturity
and Skeletal Expansion Potential
Age is the single most powerful predictor of MARPE success and the amount of suture separation in miniscrew-assisted expansion. Recent clinical research has documented that female patients show consistently higher success rates (94.2%) across all age ranges, while male patients experience a marked decline in suture separation success above age 30 (dropping to 61% in males overall). This sex-dependent effect is thought to reflect faster midpalatal suture ossification in males, a phenomenon not fully explained by chronological age alone but reflecting underlying skeletal biology.
Beyond binary success or failure, the clinical question is not whether the suture separates, but how much basal bone expansion is achieved. Even when suture separation occurs, older patients in both sexes show significantly less absolute transverse expansion compared to younger cohorts, suggesting that earlier intervention produces larger skeletal gains. A patient in their 40s or 50s will achieve some expansion, but the magnitude may not fully correct a severe transverse discrepancy. This reality must inform the surgical plan.
CBCT assessment of midpalatal suture maturation is therefore essential before committing to MARPE. High-resolution axial and coronal views should be evaluated for the degree of interdigitation, presence of circumscribed areas of ossification, and overall fusion status. While age provides a general framework, individual variation in suture maturation is substantial—two 35-year-old patients can have markedly different suture anatomy. A patient with a relatively open suture and minimal interdigitation is a favorable MARPE candidate. One with nearly fused anatomy and dense cortical interlocking may require surgical assistance (SARPE) instead.
Stage One: Miniscrew-Assisted Expansion
activation protocol
and readiness markers
Once MARPE candidacy is confirmed, the appliance is placed and activation begins. The typical protocol involves placing two or more miniscrews into the hard palate (usually between the first and second molars and laterally) and connecting them to a Hyrax expander or similar hybrid body that delivers the expansion force directly to bone rather than through tooth roots. This skeletal anchorage eliminates the dental side effects of tooth-borne RPE (tipping, buccal movement, root resorption) and allows pure skeletal displacement.
Activation rates vary by protocol and clinical judgement, but many clinicians begin with 4–5 turns per day for 3–5 days, then dial back to 3–4 turns per day for a maintenance phase extending 8–12 weeks. The slower, more controlled activation compared to adolescent RPE reflects the denser suture anatomy and the need to allow bone remodeling to keep pace with mechanical loading. Some clinicians employ a pulsatile approach: weeks of activation followed by weeks of rest, allowing the suture time to remodel and calcify the newly expanded space before further opening.
Radiographic monitoring is mandatory. Periapical radiographs taken at baseline, mid-expansion, and final expansion show the opening of the midpalatal suture and the eruption of a diastema between the upper central incisors—both hallmarks of true skeletal separation rather than dental tipping alone. CBCT at final expansion documents the three-dimensional palatal morphology, confirms suture opening, and quantifies the transverse gain at the basal bone level. The goal is clear radiographic evidence of separation, not merely a clinical diastema, which can occur from dental tipping alone.
The Critical Handoff:
Confirming Suture Separation
and Coordinating Surgical Timing
Once expansion is complete and radiographic evidence of suture separation is confirmed, the question becomes: how long to retain MARPE, and when to schedule Le Fort surgery? This transition phase is often overlooked but is essential for surgical success. A 6-month retention period is standard in most protocols, allowing newly formed bone within the expanded suture space to mineralize and stabilize. During this time, the miniscrews remain in place (or are retained for passive stability), and the patient wears a static retainer to prevent any relapse of the transverse expansion.
At the end of retention, a final CBCT and updated cephalometric analysis document the achieved transverse correction and inform the surgical planning. The operating surgeon now knows the exact width of the palate, the height of the alveolar process, and the degree of residual anteroposterior or vertical discrepancy requiring Le Fort correction. This imaging-to-surgery window should be no more than 3–4 weeks. Lengthy delays allow minor relapse and reduce the precision of preoperative surgical planning.
Coordination between orthodontist and surgeon is critical. Unlike sequential RCT treatment plans, where the surgeon may have minimal interaction with the appliance, the two-stage maxilla requires explicit communication: the orthognathic surgeon should review the final MARPE CBCT, confirm that the transverse width now matches the surgical target, and adjust the Le Fort osteotomy design if needed. In some cases, the surgeon may recommend minor orthodontic positioning before surgery (e.g., leveling and aligning, slight buccal root torque) to optimize the surgical plane. These details are only possible if the surgical team is engaged early in the MARPE phase.
Stage Two: Le Fort I Osteotomy
in the context of prior MARPE
and modified surgical technique
The Le Fort I osteotomy in a patient who has undergone MARPE differs subtly but importantly from a Le Fort in a non-expanded maxilla. The surgical field is wider, the palate is straighter and less constricted, and the surgeon encounters fewer vascular and neurovascular constraints. The osteotomy design—the precise level and location of the bony cuts—may be simplified because the transverse correction is already achieved at the basal bone level, and the surgeon's focus shifts entirely to anteroposterior and vertical repositioning.
In some two-stage cases, particularly those with severe initial transverse deficiency and mild-to-moderate anteroposterior insufficiency, the Le Fort may be combined with a simultaneous bimaxillary procedure (upper advancement plus lower setback, for example). The expanded maxillary base created by MARPE makes such combined procedures more predictable because there is less mechanical interference, less relapse from incomplete correction, and a more harmonious final transverse-to-anteroposterior relationship.
A common surgical question: should the miniscrews be removed before Le Fort, during Le Fort, or left in place? Current best practice is to remove them during the surgical procedure itself, allowing the surgeon to inspect the palatal mucosa, confirm complete healing of the screw sites, and eliminate any potential post-operative irritation. If miniscrews are left in place through the Le Fort and beyond, they should be monitored for loosening and removed well before final orthodontic finishing to avoid wire engagement.
Practical Considerations and Troubleshooting
What to watch for
in two-stage maxillary correction
Several clinical pitfalls commonly arise in two-stage cases. The first is incomplete suture separation at the end of the activation phase. If radiographs show only partial diastema or minimal radiographic evidence of suture opening, the orthodontist faces a difficult choice: continue activation (risking excessive dentoalveolar tipping), discontinue MARPE and proceed with surgical assistance, or extend the retention phase and reassess in 2–3 months. Most clinicians, if suture separation is evident but modest, will continue retention and proceed to surgery with the understanding that the surgeon may need to complete a midpalatal osteotomy intraoperatively if additional width is needed.
A second concern is relapse during the retention phase or the surgical waiting period. The hard palate, unlike the periodontal ligament around teeth, does not have a strong recoil tendency, but the expanded suture space can mineralize in a way that slightly narrows the width if retention is loose or discontinued prematurely. Static retention (a bonded palatal wire or a removable palatal plate) should be prescribed and monitored throughout the transition to surgery.
Finally, age-related biology must inform the surgical timeline. A male patient aged 45 who achieves only modest MARPE expansion (say, 3–4 mm of basal width gain) may require the surgeon to accept this limitation and prioritize anteroposterior correction to avoid a prolonged treatment or repeated expansion. Conversely, a younger female patient (30s) with robust suture separation can often achieve the full transverse target and enter surgery with high confidence in the baseline correction.
Building Your Two-Stage Protocol
diagnostic workflow
and team communication
Implementing a reliable two-stage maxillary correction protocol requires systematic preparation. At the initial consultation, the orthodontist must complete a full transverse assessment: measure posterior cross-bite severity, palatal depth, and midpalatal suture morphology via CBCT. The surgical team—either at your practice or in consultation with an oral surgeon—should be brought into the case early so that the treatment plan is jointly designed, not handed off after the fact.
Documentation should include a written surgical request outlining the target transverse width, the expected timeline for MARPE completion and retention, and any concerns about the patient's age or sex-dependent biology. Many clinicians create a checklist: baseline imaging, miniscrew placement, activation protocol, radiographic monitoring schedule, retention plan, pre-surgical imaging window, and final surgical consultation. This systematic approach reduces miscommunication and ensures the surgical team has everything needed to schedule and plan the Le Fort osteotomy.
For residents and younger clinicians just beginning to manage two-stage cases, Dr. Mark Radzhabov recommends starting with moderate transverse deficiency cases (5–7 mm of width loss) in females aged 25–40, where MARPE success is highest and the surgical coordination is straightforward. As experience grows, expand to older patients, higher-complexity cases, and those with combined anteroposterior and transverse problems. The foundation is always the same: clear patient selection, meticulous MARPE execution, and seamless surgical handoff.
Learn the full MARPE protocol from Dr. Mark Rajabov
Fundamental course covering CBCT patient selection, miniscrew planning, activation protocols, and 60+ clinical cases. Choose the access level that fits your practice.
Essentials of rapid palatal expansion for practicing orthodontists.
- Core RPE concepts and biomechanics
- 6 structured video lessons
- Clinical decision checklists
- Lifetime access to recordings
Deep-dive into MARPE protocol, diagnostics, and clinical execution.
- 6 modules covering MARPE from A to Z
- CBCT case selection walkthroughs
- Miniscrew placement and activation
- 60+ annotated clinical cases
- Direct Q&A with Dr. Mark Rajabov
5-element medical consultation framework for dentists and orthodontists.
- Trust-building consultation protocol
- 5 lesson modules
- Templates for treatment plan delivery
- Works with any clinical specialty
Clinical FAQ
What is the optimal age window for MARPE success in adult patients?
Females show consistent high success (94%) across ages 15–60. Males decline markedly above age 30, reaching 61% overall. Patients under 35 generally achieve larger absolute transverse expansion. Above 50, basal gains diminish significantly. Age combined with CBCT assessment of suture maturity guides candidacy.
How do I know if a patient has achieved true palatal suture separation versus just dental tipping?
True skeletal separation is confirmed by a midline diastema on clinical exam AND radiographic evidence of suture opening on periapical radiographs. CBCT shows the three-dimensional palatal split and basal bone expansion. Dental tipping alone produces a diastema without radiographic suture opening.
Should MARPE be removed before Le Fort surgery or during the procedure?
Miniscrews are best removed during Le Fort osteotomy to allow the surgeon to inspect palatal healing and confirm screw site closure. If left in place through surgery, they must be monitored for loosening and removed before final orthodontic finishing to avoid wire interference.
What is the recommended retention period after MARPE expansion completion?
A minimum 6-month retention phase is standard before Le Fort surgery. The appliance or a static palatal retainer maintains the expanded width, allowing the midpalatal suture space to mineralize and stabilize, reducing relapse and improving surgical predictability.
How does prior MARPE change the Le Fort I osteotomy design?
MARPE pre-expansion widens the surgical field, reduces palatal constriction, and eliminates transverse correction as a surgical goal. The surgeon focuses solely on anteroposterior and vertical repositioning. The osteotomy may be simplified, and combined bimaxillary procedures become more predictable.
Can I proceed to Le Fort surgery if MARPE achieves only partial suture separation?
Yes, but with surgical modification. Partial separation indicates some basal expansion and suture remodeling. The surgeon can complete the midpalatal split intraoperatively if additional width is needed. Communicate this possibility in your pre-surgical note to the operating surgeon.
What imaging should I send to the surgical team before Le Fort scheduling?
Provide the final MARPE CBCT (axial, coronal, sagittal views), post-expansion periapical radiographs showing diastema, updated lateral and frontal cephalographs, and a written note summarizing achieved transverse width and any clinical concerns (e.g., miniscrew loosening, soft-tissue findings).
Is MARPE appropriate for patients with syndromic skeletal or severe palatal morphology?
MARPE can be attempted in syndromic patients, but CBCT assessment of suture anatomy is critical. Severe palatal vault narrowing or ossified sutures may make MARPE ineffective. Surgical expansion (SARPE) may be necessary. Multidisciplinary evaluation is recommended.
How long after MARPE completion can I safely schedule Le Fort surgery?
Schedule Le Fort 6–9 months post-MARPE to allow complete retention and suture consolidation. Surgical imaging (final CBCT) should be obtained 3–4 weeks before the procedure. Longer delays risk minor relapse and loss of surgical precision. Coordinate timing with your surgical colleague early.
What is the post-operative orthodontic plan after two-stage Le Fort treatment?
After Le Fort, patients typically undergo a 2–3 month healing phase with minimal orthodontic activity. Then final detailing (interarch coordination, fine root torque, settling) proceeds for 4–8 months. Total treatment time from MARPE start to braces-off is typically 18–24 months. Retention planning follows standard protocols.
The two-stage maxilla—MARPE now, Le Fort later—represents a shift from monolithic surgical correction to staged skeletal refinement. By achieving palatal suture separation and basal bone expansion before the scalpel, clinicians reduce intraoperative difficulty, improve the width of the surgical field, and create more stable foundations for final occlusal positioning. Success hinges on patient age assessment, confirmation of suture separation via CBCT, and close orthodontic-surgical coordination. If you are managing adult patients with transverse deficiency or are preparing a case for combined expansion and orthognathic surgery, schedule a case review consultation with Dr. Mark Radzhabov at Orthodontist Mark to refine your sequencing protocol.
