Full Mouth Rehabilitation (FMR) - Complete Guide

1. What Is Full Mouth Rehabilitation?

2. Indications for FMR

• Generalized tooth wear (attrition, erosion, abrasion, abfraction)
• Reduced Occlusal Vertical Dimension (OVD)
• Severely compromised aesthetics across both arches
• Multiple missing teeth with collapsed occlusion
• Amelogenesis imperfecta / dentinogenesis imperfecta
• Bruxism with extensive wear
• Trauma from occlusion causing periodontal damage
• Unacceptable function (tilted/over-erupted teeth disrupting occlusion)
• Lack of interocclusal space for individual restorations

3. Pre-Treatment Assessment Essentials

1. Centric Relation (CR) - must be accurately recorded; mount study casts in CR
2. Current OVD - measure with Willis gauge, Niswonger's method, or phonetics
3. Freeway space (FWS) - normally 2-4 mm; if >4 mm, VDO can be increased
4. Occlusal plane - evaluate using Broadrick's flag or Fox plane
5. TMJ status - rule out active disc displacement, arthritis, or muscle pain
6. Periodontal status - all active disease must be controlled before prosthodontic phase
7. Diagnostic wax-up - mandatory; confirms space, aesthetics, and occlusal scheme
8. Provisional restorations - test the new OVD and guidance for 4-8 weeks minimum

4. Turner & Missirlian Classification of Occlusal Wear (1984)

5. The Major FMR Philosophies/Techniques

A. Hobo's Twin-Table Technique (Earlier Version)

B. Hobo & Takayama Twin-Stage Procedure (Main Technique)

Core Principle

• Condylar path and incisal path show deviation and are unreliable
• Cusp angle does NOT deviate - it is 4x more reliable
• A standard effective cusp angle is predetermined to ensure adequate posterior disclusion
• No need for pantograph or fully adjustable articulator

The Two Conditions (Stages)

• Anterior segment is removed from the cast
• Posterior teeth are waxed/restored using the standard cusp angle
• Cusp morphology is built to produce the standard amount of posterior disclusion
• Equal simultaneous contacts in centric; posterior disclusion in all eccentric movements

• Anterior segment is replaced onto the cast
• Anterior tooth morphology is established to create definitive disclusion
• Incisor contact in protrusion; canine contact on working side in lateral excursion
• The anterior guidance is harmonized with the pre-set posterior cusp angles

Occlusal Scheme

• Canine-guided occlusion (canine disclusion on working side)
• Posterior disclusion in ALL eccentric movements
• NO group function
• NO freedom in centric (unlike PMS)

Instrumentation Required

• Semi-adjustable articulator (e.g., Denar, Hanau)
• Facebow transfer
• CR record (any standard technique - leaf gauge, Lucia jig)
• Standard cusp angle table (provided by Hobo)
• NO pantograph required

Step-by-Step Clinical Procedure

1. Thorough diagnosis + study casts mounted in CR
2. Diagnostic wax-up to confirm new OVD and tooth form
3. Provisional restorations - test for 4-8 weeks
4. Confirm patient adaptation; adjust anteriors and posteriors in provisionals
5. Prepare posterior teeth first (or one quadrant at a time)
6. Fabricate posterior crowns using Condition 1 (standard cusp angle, no anterior guidance yet)
7. Cement posterior restorations; verify contacts
8. Prepare anterior teeth
9. Establish anterior guidance using Condition 2 (harmonize with posterior cusp angles)
10. Cement anterior restorations
11. Final occlusal check and equilibration

Indications - Use Hobo Twin-Stage When:

• Turner-Missirlian Category 1 (loss of OVD; must restore VDO)
• Generalized attrition with reduced freeway space
• Amelogenesis imperfecta with VDO loss
• Patient has healthy periodontium (FGP cannot be used in weak periodontium, but Hobo can)
• Clinician wants a simpler, reproducible system without fully adjustable articulators
• Cases involving single crowns, FPDs, implants, or full arch reconstructions
• TMD patients (Hobo is suitable for TMD cases)
• When canine-guided occlusion is the goal

Contraindications:

• Severe skeletal malocclusion (Class II div 2, Class III) - standard cusp angles may not apply
• Severely abnormal Wilson curve or curve of Spee
• Abnormally tilted or rotated posterior teeth
• Cases where group function is mandated clinically

C. Pankey-Mann-Schuyler (PMS) Philosophy

Core Principle

• Based on Monson's spherical theory of occlusion (all teeth lie on an 8-inch sphere)
• Group function on the working side (canine + posterior teeth contact simultaneously)
• Long centric (freedom in centric) - essential feature
• Protrusive movement: only anterior teeth contact

PMS Sequence (The "Cross the Arch" Rule)

1. Restore maxillary anterior teeth first - establish aesthetics, phonetics, incisal length
2. Restore mandibular posterior teeth - using Broadrick occlusal plane analyzer
3. Restore maxillary posterior teeth - using FGP technique against mandibular posteriors
4. Restore mandibular anterior teeth last

FGP (Functionally Generated Path) Technique

• Wax is placed on the posterior crown preparations
• Patient performs functional movements (chew, slide, protrude)
• The opposing dentition carves the occlusal morphology directly into the wax
• This generates a "physiologically true" occlusal surface for that patient
• Limitation: wax can distort - significant potential for errors

Broadrick Occlusal Plane Analyzer

• Establishes the ideal curve of Spee for the mandibular arch
• Helps determine correct occlusal plane for mandibular posteriors
• Based on the 4-inch radius from condyle to occlusal plane

Indications - Use PMS When:

• Turner-Missirlian Category 2 (no OVD loss, space available between CR and ICP)
• Patient where group function is the desired or pre-existing occlusal scheme
• Cases where customized occlusal morphology via FGP is preferred
• When Broadrick occlusal plane analysis is needed to set posterior occlusal plane
• Cases with complex mandibular posterior needs
• When long centric is clinically indicated

Contraindications:

• Periodontally weak teeth - FGP cannot be accurately recorded on mobile teeth
• Cases requiring canine-protected occlusion
• When condylar path cannot be accurately recorded
• Active TMD or muscle dysfunction

D. Dawson's Approach (Centric Relation Based)

• Absolute foundation: all treatment planned from verified centric relation (bi-manual manipulation)
• Anteriors restored first to establish correct anterior guidance and phonetics
• Posteriors follow, with stable contacts in CR
• Diagnostic wax-up and provisionalization are non-negotiable
• Works well with most articulators

E. Gnathologic Approach

• Most precise but most demanding
• Uses fully adjustable articulator + pantograph for exact condylar recordings
• Canine-protected occlusion with immediate posterior disclusion
• Used for complex cases where condylar path deviation cannot be ignored

6. Comparison Table: Hobo Twin-Stage vs PMS

7. Other Techniques Worth Knowing

8. Decision-Making Checklist

STEP 1 - Establish Diagnosis

• Identify cause of wear: attrition? erosion? abrasion? abfraction? mixed?
• Address etiology first (acid reflux, bruxism, diet)
• Complete periodontal charting - treat all active disease before prosthodontic phase
• TMJ evaluation - rule out active disc displacement, effusion, or myofascial pain
• Radiographic survey (FMX or CBCT if needed)

STEP 2 - Classify the Case (Turner-Missirlian)

• Is OVD reduced? Measure with Willis gauge + phonetic assessment
• What is freeway space? (Normal: 2-4 mm)
• Is there a CR-to-ICP slide? How large?
• Category 1 = OVD loss + adequate freeway space → restore OVD
• Category 2 = No OVD loss + space exists (CR-ICP slide) → use space without raising OVD, or raise minimally
• Category 3 = No OVD loss + no space → Dahl/localized approach first to create space

STEP 3 - Assess Occlusal Scheme

• Is existing occlusion canine-guided or group function?
• Is canine protected occlusion achievable (canine position, height adequate)?
• Is there skeletal malocclusion? (Class II Div 2, Class III - may preclude Hobo)
• Are posterior teeth normally angulated (no severe tipping or rotation)?
• Are curves of Spee and Wilson within normal limits?

STEP 4 - Assess Periodontal Foundation

• All pockets ≤3 mm (or stable with maintenance)?
• No pathological mobility?
• Adequate attached gingiva?
• Biologic width intact or corrected by crown lengthening?
• If mobility present → PMS/FGP is contraindicated; choose Hobo or Gnathologic approach

STEP 5 - Technique Selection

• Category 1 + healthy periodontium + canine guidance desired → Hobo Twin-Stage
• Category 2 + stable teeth + group function acceptable → PMS
• Category 3 + minimal intervention preferred → Dahl approach (composites/localized overlay)
• TMD present → Stabilization splint 4-12 weeks, then reassess; Hobo is preferred once stable
• Skeletal malocclusion → Orthodontic or surgical correction first, then reassess
• Fully edentulous arches involved → Complete denture prosthodontics principles apply

STEP 6 - Provisional Phase (Mandatory)

• Diagnostic wax-up completed?
• Provisionals fabricated at new OVD?
• Patient monitoring period: minimum 4-6 weeks; ideally 3 months for OVD changes >3 mm
• No muscle pain, TMJ pain, or speech issues during provisional phase?
• Phonetics acceptable (/s/ sound, /f/ and /v/ sounds, /m/ - freeway space check)?
• Patient satisfied with aesthetics at provisional stage?

STEP 7 - Final Restoration Sequencing

• Prepare and restore posterior teeth first (Condition 1 - without anterior guidance)
• Cement posteriors; verify equal contacts in CR
• Prepare and restore anterior teeth (Condition 2 - establish anterior guidance)
• Verify canine guidance on working side; anterior guidance in protrusion
• Confirm complete posterior disclusion in all eccentric movements

• Restore maxillary anteriors first (establish incisal edge position, aesthetics)
• Restore mandibular posteriors using Broadrick occlusal plane analyzer
• Restore maxillary posteriors using FGP technique
• Restore mandibular anteriors last
• Verify group function on working side; anterior contact in protrusion

STEP 8 - Final Occlusal Verification

• Equal simultaneous contacts in CR (shimstock check all quadrants)
• No deflective contacts in CR
• Correct guidance pattern (canine or group function per plan)
• All posterior teeth disclude in protrusion
• Balancing side free of contacts
• Check under magnification or T-scan if available

STEP 9 - Review and Maintenance

• Occlusal splint provided (especially for bruxers)?
• 1-week, 1-month, 3-month, 6-month review scheduled
• Periodontal maintenance ongoing every 3-4 months
• Patient instructions on occlusal splint use, diet, oral hygiene

9. Quick Reference: When to Use Which Technique

PATIENT PRESENTS WITH TOOTH WEAR
         |
         ↓
Is OVD REDUCED?
    |           |
   YES          NO
    |           |
   Cat 1     Is there CR-ICP slide / interocclusal space?
    |              |              |
 ↓             YES (Cat 2)    NO (Cat 3)
HOBO           PMS            DAHL / localized composite
Twin-Stage     (if perio OK)  (create space first)
               OR HOBO
               (if canine
                guidance
                preferred)
         |
         ↓
Is there MALOCCLUSION or ABNORMAL TOOTH POSITION?
→ Orthodontics/Surgery FIRST, then reassess

Is there ACTIVE TMD?
→ Splint therapy first, then Hobo once stable

Is periodontium COMPROMISED (mobile teeth)?
→ Avoid PMS/FGP; use Hobo or Gnathologic approach

10. Key Concepts Summary

• Starting point - patient with tooth wear requiring FMR assessment
• Primary branch - OVD reduced or not (Turner-Missirlian classification)
• Three technique pathways:
  • Hobo Twin-Stage for Category 1 (OVD loss) with healthy periodontium and normal tooth angulation
  • PMS for Category 2 (space available, no OVD loss) with stable teeth - or Hobo if canine guidance is preferred
  • Dahl Approach for Category 3 (no space, no OVD loss) to create interocclusal space first
• Three prerequisite flags for active TMD, active periodontal disease, and skeletal malocclusion - all requiring treatment before FMR
• Universal footer reminding that diagnostic wax-up and provisionalization are mandatory for every case regardless of technique