Foundation-First Management of an Adult Transverse and Sagittal Malocclusion: A Longitudinal Orthodontic Case Report

Introduction

Orthodontic expertise is often most visible in the order in which problems are solved. A malocclusion that presents simultaneously with inadequate transverse coordination, a sagittal discrepancy, dental irregularity, and vertical considerations can become mechanically inefficient when all objectives are pursued at once. A more disciplined strategy is to identify the foundational problem, reduce it, then apply increasingly precise mechanics as complexity falls.

The transverse dimension deserves particular attention in adult patients. Nonsurgical maxillary expansion has been reported in selected adults, but the biologic response differs from that of growing patients and much of the correction can be dentoalveolar rather than skeletal. Handelman and colleagues documented clinically useful adult transverse changes with a Haas-type expander, while also emphasizing careful case selection and periodontal considerations.[1] These findings support the possibility of adult arch development but do not justify treating every adult transverse discrepancy with the same protocol.

Sagittal correction also requires evidence discipline. Systematic reviews of fixed functional and interarch Class II correction show that clinically useful sagittal improvement can be achieved, but the treatment effect is frequently dominated by dentoalveolar rather than large skeletal change.[2,3] Thus, the clinically meaningful question is not whether an appliance created a dramatic orthopedic effect, but whether it contributed to a favorable and maintainable interarch relationship without compromising the face, periodontium, or vertical dimension.

The present longitudinal case is instructive because the photographic sequence shows treatment complexity being removed in a recognizable order: early transverse foundation development, comprehensive alignment, active sagittal correction, and late detailing. The case also provides initial and final panoramic, lateral cephalometric, and frontal radiographic records. Because calibrated casts and formal cephalometric tracings were not supplied, the analysis intentionally separates what can be observed from what can be measured.

Case Presentation and Diagnostic Assessment

At the initial examination on March 17, 2014, the patient was 27 years 11 months old. The facial photographs demonstrated generally balanced adult proportions and a pleasant smile that were important to preserve during treatment. Intraorally, the maxillary arch appeared relatively tapered, transverse coordination was limited, localized rotations and alignment discrepancies were present, and the sagittal relationship warranted active correction. The anterior vertical overlap was increased but remained functional, and the mandibular arch showed mild irregularity. No calibrated digital models, direct millimeter arch-width measurements, or complete pretreatment-to-final cephalometric tracing dataset was available in the supplied archive. For that reason, the case is reported with qualitative and ordinal clinical assessments rather than invented linear or angular values. This approach follows the central discipline of case reporting: the narrative should reflect the evidence actually available.[4]

Treatment Objectives

• Develop a broader, more physiologic maxillary arch form and improve transverse coordination within adult periodontal and dentoalveolar limits.
• Correct the sagittal interarch relationship without compromising facial balance or producing undesirable incisor compensation.
• Align and level both arches while maintaining control of anterior tooth position and vertical overlap.
• Establish functional posterior intercuspation and clinically favorable overjet and overbite.
• Finish with a natural smile, healthy-appearing tissues, coordinated arch forms, and an occlusion suitable for retention.

Why the Result Is Excellent

Calling a case excellent should require more than a pleasing final photograph. In this case, the designation is supported by five independent features.

1. The foundation improved. The maxillary arch changed from a relatively tapered and poorly coordinated form to a visibly broader and better-coordinated form. This reduced the need to make the final fixed-appliance phase compensate for an inadequate base.

2. The sagittal correction was integrated rather than isolated. Bilateral spring mechanics were used within a broader sequence that had already begun to address transverse form. The final interarch relationship appears functional without an obvious sacrifice in facial balance.
3. The vertical relationship was controlled. The patient began with increased but functional overlap. The final record shows a functional overbite rather than a treatment-induced open bite or an obviously excessive deep bite.
4. Finishing occurred after complexity fell. Late records show that treatment demands shifted from major correction to coordination, detail, contacts, overlap, and smile refinement. That transition is exactly what efficient sequencing should accomplish.
5. The case is presented with evidence discipline. The report does not invent millimeter expansion, cephalometric change, or formal ABO scores. Instead, it identifies where calibrated models, original radiographs, and tracing data would be required. This transparency increases the credibility of the outcome.

Discussion

Adult transverse development: useful, but biologically different

The principal diagnostic lesson is not that every adult narrow arch should be expanded. Rather, the transverse problem must be recognized before the teeth are cosmetically aligned. Adult maxillary development is biologically different from expansion in growing patients. Handelman et al. reported nonsurgical rapid maxillary expansion in adults with useful transverse gains and long-term stability in selected cases, but much of the change was attributable to alveolar and dental displacement, underscoring the need to respect the periodontium.[1]

Long-term arch-form research also cautions against assuming that every treatment-induced width change will be maintained indefinitely. De la Cruz et al. found a tendency for treated arch form to move back toward the pretreatment configuration after retention.[6] BeGole et al. similarly emphasized the importance of arch form and long-term evaluation when premolar expansion is used.[7] These data strengthen the rationale for individualized expansion and retention rather than weaken the foundation-first concept: the width objective should be biologically appropriate and deliberately protected.

Sagittal mechanics: judge the clinical relationship, not the marketing claim

The exact brand, force level, and activation protocol of the bilateral spring system in this case were not documented in the supplied archive. Therefore, the case should not attribute a specific skeletal effect to a named appliance. Systematic reviews of fixed functional Class II treatment show that these appliances can improve sagittal relationships, with effects that are frequently more dentoalveolar than skeletal and with limited high-quality evidence for long-term skeletal stability.2,3 The final relationship and its compatibility with the face are therefore more defensible outcome claims than a presumed orthopedic mechanism.

Finishing: objective evaluation matters

The final record appears strong, but excellent orthodontic finishing should be examined systematically. Casko et al. established the ABO objective grading system using alignment, marginal ridges, buccolingual inclination, occlusal relationships, occlusal contacts, overjet, interproximal contacts, and root angulation.5 In the present case, photographs and the final panoramic image support several of these domains, but calibrated digital models were not supplied. The authors therefore characterize the finish as an A− educational clinical outcome (92/100), not as an official ABO score.

This distinction is important for readers. An A− clinical teaching grade communicates that the overall finish is strong while still recognizing that marginal ridges, buccolingual inclination, precise contacts, and other model-based details require direct measurement. It also models the kind of self-audit that improves orthodontic expertise.

Retention and long-term responsibility

Retention remains integral to any claim of orthodontic success. Long-term studies demonstrate gradual postretention change even after high-quality treatment. Al Yami et al. found that a substantial proportion of treatment correction was maintained 10 years after retention, but relapse occurred across multiple occlusal traits and was especially important early after retention.8 A recent Cochrane review likewise confirms that retention strategies remain necessary despite uncertainty regarding the superiority of individual protocols.9 The present archive does not supply the detailed retention design, wear schedule, compliance record, or long-term postretention follow-up needed to claim permanent stability. Accordingly, the appropriate conclusion is that the final result has favorable stability potential, with retention remaining essential.

Why This Case Matters for Orthodontic Expertise

This case is educational because it allows the clinician to ask a more sophisticated question than “Are the teeth straight?” The correct question is “Did the treatment reduce the right problems in the right order?” A less experienced reading of the case might focus primarily on the final smile. A more advanced reading recognizes that the final smile is the visible consequence of several prior decisions: preserve an already acceptable facial balance, develop the transverse foundation, maintain vertical control, add sagittal mechanics once the foundation is improving, and reserve late treatment for detailed finishing.

This sequence also provides a useful framework for case critique. When a final case is not ideal, the orthodontist should determine whether the limitation represents an unresolved foundational problem or simply unfinished dental detail. Those are not the same failure. Conversely, a spectacular alignment result should not be allowed to conceal an untreated transverse, sagittal, or vertical discrepancy.

Limitations

• The report is retrospective and describes a single patient; it cannot establish superiority of a treatment philosophy or appliance.
• Calibrated digital models or casts were not available for independent measurement of arch widths, crowding, contacts, marginal ridges, buccolingual inclination, or formal objective grading.
• Numerical pretreatment-to-final cephalometric tracings and superimpositions were not supplied; skeletal and incisor changes are therefore described qualitatively.
• The exact maxillary development appliance prescription, activation schedule, spring brand, force level, and compliance record require confirmation from the treatment chart.
• The detailed retention protocol and long-term postretention record were not available.
• Written patient consent for identifiable publication should be documented before journal submission.

Conclusion

This adult case demonstrates a clinically coherent progression from foundation development to sagittal correction to finishing. The final result is excellent because facial balance was preserved while arch form, alignment, interarch coordination, and vertical overlap improved together. The treatment record also shows a steady decrease in residual clinical complexity, allowing late-stage mechanics to concentrate on refinement rather than rescue. For the orthodontist, the transferable lesson is simple: diagnose the foundation before selecting finishing mechanics. Correct transverse and sagittal demands deliberately, protect the vertical dimension, and then grade the final dentition objectively. The strongest case reports do not exaggerate what treatment achieved; they make the treatment logic visible and define precisely what the records can prove

References

1. Handelman CS, Wang L, BeGole EA, Haas AJ. Nonsurgical rapid maxillary expansion in adults: report on 47 cases using the Haas expander. Angle Orthod. 2000;70(2):129-144. doi:10.1043/0003-3219(2000)070<0129:NRMEIA>2.0.CO;2.
2. Zymperdikas VF, Koretsi V, Papageorgiou SN, Papadopoulos MA. Treatment effects of fixed functional appliances in patients with Class II malocclusion: a systematic review and meta-analysis. Eur J Orthod. 2016;38(2):113-126. doi:10.1093/ejo/cjv034.
3. Bock NC, von Bremen J, Ruf S. Stability of Class II fixed functional appliance therapy-a systematic review and meta-analysis. Eur J Orthod. 2016;38(2):129-139. doi:10.1093/ejo/cjv009.
4. Gagnier JJ, Kienle G, Altman DG, Moher D, Sox H, Riley D; CARE Group. The CARE guidelines: consensus-based clinical case reporting guideline development. J Med Case Rep. 2013;7:223. doi:10.1186/1752-1947-7-223.
5. Casko JS, Vaden JL, Kokich VG, et al. Objective grading system for dental casts and panoramic radiographs. Am J Orthod Dentofacial Orthop. 1998;114(5):589-599. doi:10.1016/S0889-5406(98)70179-9.
6. De la Cruz A, Sampson P, Little RM, Artun J, Shapiro PA. Long-term changes in arch form after orthodontic treatment and retention. Am J Orthod Dentofacial Orthop. 1995;107(5):518-530. doi:10.1016/S0889-5406(95)70119-2.
7. BeGole EA, Fox DL, Sadowsky C. Analysis of change in arch form with premolar expansion. Am J Orthod Dentofacial Orthop. 1998;113(3):307-315.doi:10.1016/S0889-5406(98)70302-6.