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What should be the treatment plan according to an prosthodontist where all mandibular teeth are present. In maxillary arch only 12,22,23,25 are present all these are root canal treated... what are treatment options for this case

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maxillary partial edentulism AND prosthodontics

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prosthodontic treatment options maxillary partially edentulous teeth root canal treated fixed removable implant overdenture

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https://pmc.ncbi.nlm.nih.gov/articles/PMC4920826/

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partially edentulous maxilla AND dental implants

With all mandibular teeth present and only maxillary 12, 22, 23, and 25 remaining, this is a severely partially edentulous maxilla, broadly a Kennedy Class I situation with additional edentulous spaces. It should not be planned merely as “make a bridge.” The four remaining teeth are all endodontically treated, so their periodontal and structural prognosis is central to the plan.
A final choice needs clinical examination, periodontal charting, periapical radiographs, OPG, diagnostic casts or digital scan, occlusal analysis, and often CBCT if implants are considered.

1. First phase: assess whether the four teeth are worth retaining

Assess 12, 22, 23, and 25 for:
  • Periapical health and adequacy of root canal treatment
  • Remaining coronal tooth structure and ferrule
  • Cracks, recurrent caries, post/core status
  • Crown-root ratio, root morphology, mobility
  • Probing depths, attachment loss, furcation involvement of 25
  • Strategic value and position as abutments
  • Available interarch space and occlusal forces from the fully dentate mandibular arch
  • Smile line, lip support, phonetics, and the patient's hygiene ability, finances, expectations, and medical suitability for surgery
Endodontically treated teeth are not automatically extracted. Teeth with adequate periodontal support, no active apical disease, and restorability can often be retained with definitive post-core only when needed and well-fitting full-coverage crowns.

2. Do not use a long tooth-supported fixed bridge across the maxilla

A long-span conventional fixed dental prosthesis supported only by 12, 22, 23, and 25 is generally a poor option because:
  • There are bilateral distal extension saddles, so posterior support is absent.
  • The anterior edentulous span is extensive.
  • RCT-treated abutments may have less remaining tooth structure.
  • A fully dentate lower arch can place high functional load on the maxillary prosthesis.
  • Long-span bridges are difficult to clean and have unfavorable biomechanics.
A fixed bridge may be appropriate for a short bounded area only, for example 23-25 replacing 24, if both abutments have strong periodontal and restorative prognosis. It should not be used as the sole restoration for the entire arch. Literature on long-span maxillary cases also cautions that conventional tooth-supported FPDs may have an unfavorable long-term prognosis, while removable or implant-supported approaches are alternatives reviewed here.

3. Main treatment options

Option A: Implant-supported fixed rehabilitation

This is usually the most desirable option if the patient is medically suitable, has adequate bone or accepts grafting, can maintain hygiene, and accepts the cost.
Possible design
  • Retain and restore sound natural teeth 12, 22, 23, 25 with individual crowns or strategically splinted restorations only where indicated.
  • Place implants in prosthetically planned positions, often in anterior and posterior maxilla.
  • Use implant-supported single crowns and/or short implant-supported fixed bridges.
  • Avoid using the RCT-treated natural teeth as supports for an extensive cross-arch fixed bridge.
Requirements
  • CBCT-based, restoratively driven implant planning.
  • Assessment of maxillary sinus pneumatization, ridge width/height, and need for sinus augmentation or grafting.
  • Diagnostic wax-up and provisionalization to establish aesthetics, occlusal vertical dimension if altered, and tooth positions before implant placement.
Advantages
  • Fixed solution, good chewing efficiency, no palatal coverage, preservation of adjacent tooth structure.
  • Can provide posterior support and reduce stress on the remaining teeth.
Limitations
  • Surgical treatment, cost, treatment time, possible grafting, biological and maintenance risks.

Option B: Implant-assisted removable partial denture

This is often an excellent compromise where a fully fixed implant restoration is not feasible.
Possible design
  • Retain 12, 22, 23, and 25 if they are sound.
  • Make surveyed crowns on strategic teeth as needed.
  • Place one or more posterior implants, especially to support the distal extension regions.
  • Fabricate an implant-assisted cast removable partial denture, using implants to improve support and retention.
Advantages
  • Better stability than a conventional distal-extension RPD.
  • Less expensive and less surgically demanding than a full fixed implant rehabilitation.
  • Easier repair and adaptation if further tooth loss occurs.

Option C: Tooth-supported overdenture or fixed-removable prosthesis

If the remaining teeth have limited but maintainable strategic value, a tooth-supported overdenture can be considered.
Possible design
  • Reduce selected teeth to dome-shaped overdenture abutments after confirming successful endodontic treatment and periodontal health.
  • Use copings, stud attachments, or a bar where appropriate.
  • Fabricate a removable overdenture.
A fixed-removable design using a bar on retained teeth with an attachment-retained removable superstructure is another specialist option in selected cases. It can improve aesthetics, stability, hygiene access, and serviceability in long-span maxillary rehabilitation as described in this clinical report.
Advantages
  • Retains proprioception and helps preserve alveolar bone around retained roots.
  • Can offer good retention and lip support.
  • Useful if teeth are not ideal for a conventional fixed bridge but are suitable as overdenture abutments.
Limitations
  • Requires excellent hygiene and regular maintenance.
  • Attachments and dentures require periodic servicing.
  • Retained roots can develop caries or periodontal problems.

Option D: Definitive cast removable partial denture

This is the conventional non-implant option and may be the practical choice when implants are contraindicated or unaffordable.
Likely principles
  • Restore RCT-treated teeth first with appropriate foundations and surveyed crowns where required.
  • Use rests, guide planes, and reciprocation on suitable teeth.
  • A broad palatal major connector is often needed for rigidity and support in a maxillary bilateral distal-extension case.
  • Provide careful indirect retention and a design that minimizes torque on abutments.
  • Use altered-cast technique or functional impression concepts where indicated for distal extension support.
  • Establish stable, low-stress occlusion with the complete mandibular dentition.
A conventional RPD can restore aesthetics and function but needs diligent plaque control, periodic relining, and regular review. A recent systematic review found that RPDs can improve masticatory performance in partial edentulism, although outcomes depend strongly on design, fit, and patient factors (PMID: 37729477).

A reasonable prosthodontic sequence

  1. Comprehensive diagnosis
    • Full-mouth periodontal examination
    • Periapical radiographs for 12, 22, 23, 25
    • OPG and CBCT if implants are contemplated
    • Mounted diagnostic casts or digital articulation
    • Photographs, smile evaluation, and diagnostic wax-up
  2. Disease control
    • Periodontal therapy and oral-hygiene stabilization
    • Treat caries, defective restorations, endodontic failure, or apical disease
    • Extraction only of teeth with hopeless prognosis
  3. Provisional phase
    • Interim acrylic partial denture or provisional restoration to assess appearance, speech, vertical dimension, and patient tolerance.
    • This is particularly useful before a complex implant plan.
  4. Definitive rehabilitation
    • Preferably implant-supported fixed restoration if feasible.
    • Otherwise implant-assisted RPD.
    • Otherwise well-designed cast RPD or tooth-supported overdenture, based on abutment prognosis.
  5. Maintenance
    • Review every 3-6 months initially.
    • Monitor periodontal status, abutment caries, occlusion, denture fit, implant health, and endodontic/periapical status.

Practical recommendation

If 12, 22, 23, and 25 are healthy, restorable, and periodontally stable, I would generally avoid extracting them solely because they are RCT-treated. A common high-quality plan would be:
  • Restore the four teeth adequately.
  • Use a diagnostic wax-up and CBCT.
  • Place strategically planned implants to establish anterior and posterior support.
  • Restore with implant-supported fixed crowns/short bridges, while retaining the natural teeth independently where possible.
If implants are not possible, the next most rational plan is usually a well-designed cast maxillary RPD, potentially enhanced by one or more posterior implants, rather than an extensive tooth-supported bridge.
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