Complete Denture Construction Course

 

Outline

Complete Denture Construction: Theoretical Steps

1. Preliminary Examination & Diagnosis

  • Thorough clinical and radiographic examination of the edentulous patient
  • Assessment of residual ridges, palatal form, muscle attachments, and soft tissue health
  • Evaluation of inter-arch space, facial support, and jaw relationships
  • Medical and dental history review

2. Preliminary (Primary) Impressions

  • Selection of appropriate stock trays
  • Use of impression compound or alginate to record the general anatomy of the edentulous arches
  • Fabrication of study casts (primary casts) from these impressions

3. Construction of Special (Custom) Trays

  • Fabricated on the primary casts using shellac base plates, self-cure acrylic, or light-cured materials
  • Designed to provide uniform spacing for final impression material
  • Tray borders are adjusted to be 2–3 mm short of the functional sulcus depth

4. Border Moulding (Muscle Trimming)

  • Borders of the special tray are built up using green stick (low-fusing) compound
  • The patient performs functional movements to establish the functional depth and width of the sulcus
  • Ensures the final impression captures the full extent of the denture-bearing area without over- or under-extension

5. Final (Secondary) Impressions

  • A wash impression is taken inside the border-moulded tray using accurate materials (zinc oxide eugenol paste, elastomers, or fluid wax)
  • Records the fine details of the mucosa, ridges, and post-dam area
  • Master casts are poured in dental stone from these impressions

6. Construction of Record Bases & Occlusal Rims

  • Record (base) plates are fabricated on the master casts — providing stability during jaw relation recording
  • Wax occlusal rims are built onto the bases to occupy the space the denture teeth will eventually fill

7. Jaw Relation Records

This is the most critical and complex phase, involving:

  • Orientation jaw relation — establishing the correct occlusal plane using the ala-tragus line (Camper's plane) and the interpupillary line
  • Vertical dimension of occlusion (VDO) — determining the correct face height at occlusion (using pre-extraction records, facial measurements, swallowing, phonetics)
  • Centric relation (CR) — recording the most retruded, unstrained position of the condyles, achieved through chin-point guidance, bimanual manipulation, or other techniques
  • Facebow transfer — recording the spatial relationship of the maxillary arch to the temporomandibular joints for accurate articulator mounting

8. Transfer to Articulator & Mounting of Casts

  • The facebow is used to mount the maxillary cast on a semi-adjustable or fully adjustable articulator
  • The centric relation record is used to mount the mandibular cast in correct relation to the maxillary cast

9. Selection & Arrangement of Artificial Teeth

  • Selection — based on size (correlated with facial measurements), shape (correlated with facial form — ovoid, square, tapering), shade, and material (acrylic resin or porcelain)
  • Arrangement — teeth are set up in wax following the principles of:
    • Neutral zone concept
    • Bilateral balanced occlusion
    • Aesthetic guidelines (midline, incisal level, anterior tooth display)

10. Try-In (Wax Trial Denture)

  • The wax dentures with teeth set up are placed in the patient's mouth
  • Assessment of:
    • Aesthetics (lip support, tooth display, smile line)
    • Phonetics (sibilant sounds — "S", "F", "V")
    • Occlusion and VDO
    • Retention and stability
    • Patient comfort and satisfaction
  • Corrections are made before processing

11. Processing (Flasking & Packing)

  • The approved wax try-in is invested in a dental flask using plaster or stone
  • The wax is eliminated by boiling water (dewaxing)
  • Heat-cure acrylic resin dough is packed into the mold
  • The flask is clamped and processed in a water bath (74°C for 7–8 hours, or short curing cycle at higher temperature) — compression moulding, or injection moulding techniques may be used
  • After processing, the dentures are divested (removed from the flask)

12. Deflasking, Finishing & Polishing

  • Dentures are carefully removed from the investing medium
  • Excess acrylic (flash) is trimmed away
  • Fitting and occlusal surfaces are refined
  • Polishing to a high gloss using pumice and polishing agents on a lathe
  • The fitting surface is not polished (left as-processed)

13. Remounting & Occlusal Correction

  • Processed dentures are remounted on the articulator (using a remount cast or index)
  • Discrepancies introduced during processing are identified and corrected by selective grinding (occlusal equilibration)
  • Ensures bilateral balanced occlusion in centric and eccentric positions

14. Insertion (Delivery) Appointment

  • Examination of the fitting surface for sharp areas (pressure-indicating paste used)
  • Assessment of extensions, retention, and stability
  • Final check of occlusion in the patient's mouth
  • Instructions given to the patient regarding:
    • Insertion and removal technique
    • Denture hygiene
    • Diet and adaptation advice
    • Importance of follow-up visits

15. Post-Insertion Review & Follow-Up

  • Appointments at 24 hours, 1 week, and 1 month
  • Relief of pressure sore areas using pressure-indicating paste
  • Occlusal adjustments as needed
  • Long-term monitoring for ridge resorption and need for relining, rebasing, or replacement

Key Principle: Each step is dependent on the accuracy of the preceding one. Errors are cumulative — a poorly extended final impression will compromise every subsequent stage, no matter how precisely the remaining steps are executed.