Denture Making

Part of Dentistry

Fabricating functional complete and partial dentures using improvised materials when modern dental laboratory resources are unavailable.

Why This Matters

When all or most teeth in an arch are lost, a denture restores chewing function, speech clarity, and facial support. Without dentures, complete tooth loss forces a person onto a severely restricted soft diet, accelerates facial aging through bone resorption without tooth-load stimulation, and affects speech significantly.

In a rebuilding society, complete tooth loss is common — particularly in older adults and those who experienced poor dental care before collapse. Denture making is a genuine high-demand skill with significant quality-of-life impact.

Modern dentures require dental acrylics, heat-curing equipment, precision impression materials, and laboratory processing. Historical dentures — made from ivory, animal teeth, human teeth, and carved bone — functioned adequately for decades despite crude materials. The principles remain the same; only the materials differ.

Historical Context

Before modern acrylics:

• Ivory dentures: Carved hippopotamus, walrus, or elephant ivory; durable but absorbed stains and odor
• Bone dentures: Carved from large animal bone; less durable than ivory but widely available
• Wooden dentures: Notably used in Japan (honeylocust wood); less durable, absorbed moisture and changed shape
• Composite dentures: Ivory or bone base with human or animal teeth attached
• Vulcanite dentures: Rubber-based bases popular in the 19th century; excellent suction, still used in some contexts

George Washington’s famous “wooden teeth” were actually ivory — the wooden story was a later myth.

Impression Taking

An accurate impression of the edentulous (toothless) ridge is the foundation of good denture fit:

Impression Materials

Wax impression: Heat wax (beeswax, carnauba wax, or tallow) to softening point; form into tray shape; cool slightly; press against ridge while warm; allow to harden. Limited accuracy but functional for a rough guide.

Plaster impression: Mix dental plaster (calcium sulfate hemihydrate) or lime plaster to paste consistency; load onto improvised tray; place in mouth; allow to set hard (5–10 minutes). Must be cracked out of mouth — requires sectional removal if undercuts present.

Clay or wax-backed impression: Fine clay pressed against ridges; allow to harden; pour plaster into the clay impression to create a model.

Making the Impression Tray

Custom to the patient:

1. Form a sheet of wax or clay to the rough shape of the arch
2. Build up a rim 10 mm tall along the ridge outline
3. This becomes the tray that holds impression material

Pouring a Model

1. Mix plaster to a smooth, creamy consistency (no lumps)
2. Vibrate gently to release air bubbles (tap container repeatedly on hard surface)
3. Pour into impression; fill completely
4. Allow to set (20–30 minutes)
5. Carefully separate model from impression
6. Model should show a clear, accurate reproduction of the ridge anatomy

Fabricating the Denture Base

Wood Denture Base

1. Select dense, fine-grained hardwood (fruitwood, boxwood)
2. Use model as guide; carve base to match ridge shape on tissue surface
3. Base should cover entire ridge, vault of palate (for upper), and extend to adequate borders
4. Tissue surface (ridge side): smooth, polished, fits closely against ridge — critical for suction
5. External surface: shaped to look like normal gum tissue

Soak completed wood base in oil (linseed oil) to reduce water absorption and dimensional change.

Bone Denture Base

Dense cortical bone from large animals (cattle skull, dense long bone):

1. Cut to rough shape with saw
2. Carve and file to final form
3. Boil to remove organic material; dry thoroughly
4. Polish smooth

Bone is harder to work than wood but more durable and less dimensionally unstable.

Vulcanite/Rubber Base (If Available)

If sulfur and rubber are available, vulcanite can be produced:

• Mix raw rubber with sulfur (5–8% by weight)
• Form to denture shape over stone model
• Heat to 150–160°C under pressure for 30–60 minutes
• Produces hard, black, dimensionally stable rubber

This requires chemistry and fabrication infrastructure but produces excellent denture bases.

Attaching Teeth

Carved Teeth (Integral with Base)

Carve tooth shapes directly from the same wood or bone as the base — or from a harder, whiter material:

• Animal teeth: Dog, sheep, or pig teeth are small enough to approximate human incisors and premolars; bovine teeth for larger posterior
• Ivory: Can be shaped to tooth form
• Hard white bone: With considerable patience, tooth shapes achievable

Attach carved teeth to base with strong adhesive (pine pitch, animal-hide glue reinforced with fiber, or epoxy if available).

Setting Teeth in Wax First

1. Set teeth in softened wax on the model in correct position
2. Have patient try in — check esthetics, lip support, vertical dimension of occlusion (jaw opening)
3. Adjust tooth position in wax
4. When satisfied, process — pour plaster around wax to encase, melt out wax, replace with base material

This trial-in step, used in professional dentistry, saves much rework.

Fitting and Adjusting

A newly made denture will not fit perfectly on first insertion:

1. Insert gently; do not force
2. Mark pressure points with a soft indicator material (flour paste, lipstick) — areas that wipe off indicate excessive pressure
3. Relieve marked areas by careful scraping or sanding
4. Repeat until the denture seats without significant discomfort
5. Check occlusion: patient bites together; adjust any premature contacts

Expect 3–5 adjustment visits before a new denture is comfortable.

Instructions for Patient

• Remove denture at night to rest gum tissue
• Clean denture after each meal with brush and water
• Soak overnight in dilute vinegar or salt water
• Never use boiling water — warps most base materials
• Report sore spots promptly — pressure sores progress to ulcers if ignored

Dentures require relining every 2–5 years as ridges resorb. A denture made well initially is the foundation; maintenance and relining extend its service life significantly.

Topics covered in dedicated articles: prosthetics.md