Prosthetics

Part of Dentistry

Dental prosthetics beyond simple dentures — obturators, palatal devices, and functional partial prosthetics for restoring special cases.

Why This Matters

Most dental prosthetics discussion focuses on standard complete or partial dentures for tooth replacement. However, dental prosthetics encompasses a broader range of devices that restore function and anatomy after disease, trauma, or developmental problems — conditions that will be encountered in any large population.

Cleft palate, oral cancer surgery, severe facial trauma, jaw fractures, and temporomandibular joint disorders all produce functional deficits requiring prosthodontic solutions. Without these devices, affected individuals may be unable to eat, speak clearly, or in some cases swallow effectively. These are quality-of-life and survival-level concerns.

Understanding the broader field of dental prosthetics prepares a rebuilding dental practitioner for the full range of cases they will encounter.

Obturators (Palate Closures)

What They Treat

Cleft palate — a developmental defect where the roof of the mouth fails to fuse — creates an opening connecting the mouth to the nasal cavity. This causes:

• Severe speech difficulty (hypernasal speech)
• Regurgitation of food and liquids through the nose during eating
• Recurrent ear and sinus infections
• Increased risk of decay and gum disease due to altered saliva flow

Palatal fistulas (holes in the palate) from surgery, trauma, or untreated infections cause similar problems at smaller scale.

The surgical correction of cleft palate requires sophisticated soft tissue surgery best done in infancy. In a rebuilding context without pediatric surgery capability, a prosthetic obturator — a device that physically closes the opening — provides functional restoration until surgical correction is possible.

Fabricating an Obturator

1. Take an impression of the palate including the defect area using whatever impression material is available (see Denture Making article)
2. Pour a model from the impression
3. Fabricate a palatal plate that covers the entire hard palate
4. Extend a button or flange into the defect space — this fills the opening
5. The device should engage around the margins of the defect for retention; clasps on adjacent teeth provide additional retention

Materials: Any denture base material (bone, ivory, wood, acrylic if available). The obturating part that fills the cleft can be the same material or a softer material if the cleft edges are irregular.

Fit considerations: The obturator must seal sufficiently to prevent food/liquid escape but not press on tissue with damaging force. Trial fit, mark pressure areas, relieve.

Adjusting to an Obturator

Patients learning to speak with a new obturator require weeks of practice. The device changes the resonance chamber of the voice. Speech therapy exercises:

• Repetitive consonant sounds that require palatal closure (p, b, d, t)
• Reading aloud daily
• Recording speech and listening back if possible (allows self-correction)

Palatal Lifting Devices

For patients with neurological conditions affecting palate elevation (after stroke, with progressive neurological disease), a palatal lift prosthesis mechanically positions the soft palate in a raised position:

• Constructed like a palatal plate with posterior extension that physically holds the soft palate up
• Reduces hypernasal speech without surgery
• Must be adjusted as patient’s soft palate mobility changes

Interim Prosthetics After Cancer Surgery

Oral cancer surgery may remove portions of the jaw (mandible or maxilla), palate, tongue, or cheek. Prosthetics in this context:

Immediate surgical obturator: Placed at surgery to cover the defect before healing — maintains space, protects the wound, allows some eating function from day one.

Transitional prosthetic: Fitted as healing occurs; modified as scar tissue contracts and shapes change (usually over 6–12 months post-surgery).

Definitive prosthetic: Made when healing is complete; designed for long-term use.

Each stage requires different design. The fundamental principle is the same: the prosthetic fills the anatomical defect and restores as much function as possible.

Mandibular Guidance Appliances

After mandibular fracture or surgery, patients may experience jaw deviation — the lower jaw moving to one side on opening. If untreated, this leads to asymmetric muscle adaptation, pain, and bite problems.

A mandibular guidance appliance — a device that attaches to the lower teeth with a ramp or incline that directs jaw movement to the correct path — can correct this during healing:

1. Take impressions of upper and lower teeth in correct position (requires both arches to be brought into correct relationship, which may need manual guidance if muscles are pulling asymmetrically)
2. Make models and mount in correct jaw relationship
3. Fabricate a lower appliance with a ramp on the incisal (biting) edge that contacts the upper front teeth on the correct side during closure, redirecting the lower jaw
4. Wear full-time except during cleaning; remove after muscles have re-educated (typically 3–6 months)

Night Guards (Occlusal Splints)

Bruxism (grinding of teeth) is common under stress — a predictable finding in any community experiencing severe ongoing stress. Bruxism causes:

• Accelerated tooth wear
• Fracture of teeth and restorations
• Jaw muscle pain and headache
• Temporomandibular joint damage

An occlusal splint — a custom-fitted appliance worn over teeth during sleep — protects teeth and reduces muscle activity.

Simple fabrication:

1. Heat thermoplastic sheet (or create a beeswax impression of the upper teeth)
2. Adapt to cover all upper teeth, approximately 2–3 mm thick
3. Patient bites into slightly soft material to establish occlusal relationship
4. Smooth and adjust edges so no sharp margins irritate gum tissue
5. Wear every night

Even a roughly made splint provides substantial protection compared to none. The tooth-wear protection alone justifies the effort.

Training and Skill Development

Dental prosthetics is a specialized skill within dentistry. A community ideally has:

• At least one practitioner with basic extraction and cavity skills (essential)
• At least one practitioner with denture-making skills (high value)
• Access to written descriptions of specialized prosthetics for the cases that arise (this article)

Document every prosthetic case: photographs if possible, molds kept for reference, impressions stored. This documentation allows continuation of care if the original practitioner is unavailable and provides teaching material for training subsequent practitioners.

Topics covered in dedicated articles: denture-making.md