Treatment Planning in Proffit's Contemporary Orthodontics

The Core Framework: "Three-Stage Treatment Planning"

Stage 1 - Establish the Ideal Treatment Plan

• What is the best possible outcome regardless of difficulty or cost?
• Based on diagnosis, cephalometrics, model analysis, growth status

Stage 2 - Modifications Toward Reality

• Patient's age, growth potential, compliance, finances
• Medical history considerations

Stage 3 - The Final Treatment Plan

• Realistic, achievable, patient-accepted plan

Treatment Plans by Malocclusion Type

1. CLASS I MALOCCLUSION WITH CROWDING

• No extraction
• Proclination of incisors (if lip protrusion allows)
• Interproximal reduction (IPR/stripping) - 0.25 mm per contact
• Minor arch expansion
• Appliance: Fixed MBT/Roth brackets, .022 slot

• Extraction of 2 premolars (usually upper 1st premolars) if lip protrusion present
• Or non-extraction with expansion if growth favorable
• Key decision: Lips at rest - if proclined, extract; if retroclined, expand

• Almost always extraction therapy
• Usually 4 premolar extractions (upper + lower 1st premolars)
• Space closure with retraction mechanics

2. CLASS I WITH SPACING

• True spacing: Orthodontic space closure + retention
• Bolton excess: Selective IPR or restorative build-ups
• Midline diastema:
  • Rule out frenum - frenectomy if needed (after orthodontic closure)
  • Habit control (tongue thrust)
  • Close orthodontically then retain permanently

3. CLASS II MALOCCLUSION - TREATMENT PLANS

Class II Division 1

• Growth modification is the treatment of choice
• Appliances: Headgear (cervical/occipital pull), Functional appliances (Twin block, Frankel, Herbst, MARA)
• Goal: Redirect mandibular growth forward, restrain maxillary growth
• Best age: Pubertal growth spurt (CS3-CS4 on CVMI)

• Functional appliance followed by fixed appliance
• "Two-phase treatment" - Phase 1 (functional) + Phase 2 (fixed detailing)
• Proffit is actually cautious about two-phase treatment - he says Phase 1 rarely gives better final results than single-phase treatment started in permanent dentition

• Camouflage: Extract upper premolars, retract upper anteriors, accept skeletal discrepancy
  • Works when ANB is 4-7 degrees, good facial profile
• Orthognathic Surgery: Mandibular advancement (BSSO) for severe ANB (>7°) or poor facial profile
• Distraction Osteogenesis: For severe mandibular deficiency

Class II Division 2

• Deep overbite is the major problem
• Treatment: Intrude upper incisors + procline them first, then treat like Class II Div 1
• Need to correct torque of upper laterals (which are proclined in Div 2)
• Retention critical - overbite tends to relapse

4. CLASS III MALOCCLUSION - TREATMENT PLANS

• Reverse articulation due to premature contact causing anterior functional shift
• Treatment: Eliminate premature contact, advance upper anteriors
• Chin cup, reverse pull headgear (facemask) in early mixed dentition

• Facemask/Reverse pull headgear - most effective in deciduous/early mixed dentition (best before age 8-10)
  • Pulls maxilla forward and downward
  • 300-500 grams per side, 12-14 hours/day
• Chin cup - restrains mandibular growth (less commonly used now due to relapse)
• BAMP (Bone-Anchored Maxillary Protraction) - modern approach using mini-implants

• Camouflage: Extract lower premolars, retract lower anteriors
  • Works for mild skeletal discrepancy (ANB not worse than -2 to -3°)
  • Compromise in facial profile
• Orthognathic Surgery: Le Fort I maxillary advancement + BSSO mandibular setback (bimaxillary surgery for severe cases)

5. DEEP BITE - TREATMENT PLANS

• Intrude lower incisors using:
  • Utility arch (Ricketts)
  • Connecticut intrusion arch
  • Tip-back mechanics
  • TADs (mini-implant supported intrusion)
• Extrude posterior teeth (if vertical dimension increase is acceptable)

• Posterior bite blocks to open vertical dimension
• Functional appliances with posterior bite planes
• Surgery (Le Fort I with posterior impaction) in adults

6. OPEN BITE - TREATMENT PLANS

• Habit elimination first (tongue crib, lip bumper)
• Spontaneous closure often follows habit elimination in growing patients
• If not: extrude anteriors with box elastics
• TADs for molar intrusion (very effective, avoids surgery)

• Growing patient: Vertical control with headgear (high pull), bite blocks
• Adult: Surgical - Le Fort I maxillary impaction (most stable treatment for skeletal open bite)
• Proffit emphasizes that skeletal open bite treated with orthodontics alone has high relapse

7. CROSSBITE - TREATMENT PLANS

• Unilateral: Rule out functional shift first
  • If functional: Expand to eliminate shift (removable expander, quad helix, rapid palatal expansion)
• Bilateral maxillary constriction: RPE (rapid palatal expander) in growing patients
  • MARPE (mini-implant assisted RPE) in adults
  • Surgery (SARPE - Surgically Assisted RPE) for adults with fused suture

• Inclined plane, Z-spring, reverse bracket bonding
• Must have adequate overbite to maintain correction

8. CROWDING + SKELETAL DISCREPANCY (COMBINED PROBLEMS)**

• Class II + crowding in growing patient → Headgear/functional + possible extraction
• Class III + crowding in growing patient → Facemask + possible lower extraction later
• The "extraction trap": Don't extract if the skeletal problem still needs correction - you'll run out of space for orthopedic treatment

9. ADULT ORTHODONTICS

• No growth available - all skeletal corrections must be surgical or camouflage
• Periodontal condition must be controlled BEFORE orthodontics
• Teeth move more slowly; root resorption risk higher
• Adjunctive treatment: For restorative/prosthetic preparation (uprighting tilted teeth, creating implant space, forced eruption)
• Comprehensive treatment: Full orthodontic correction ± surgery

10. ORTHOGNATHIC SURGERY TREATMENT PLANNING

11. RETENTION PLANNING

• Every orthodontic case needs retention
• Removable retainers (Hawley, Essix/vacuum-formed)
• Fixed lingual retainers (lower anteriors especially)
• Deep bite cases - longer retention
• Permanent retention for generalized spacing, periodontal patients, and tooth size discrepancies

Proffit's Key Decision-Making Principles (Summary)

Note for Dr. Anu: The Proffit textbook itself is not in this library's database, so this is drawn from my knowledge of the 5th and 6th editions of Contemporary Orthodontics. If you need specific page references or want me to go deeper on any one malocclusion category - like the detailed mechanics for Class II or the growth modification section - just ask and I'll break it down further for your MDS exams!