Dental prostheses are medical devices designed to replace natural teeth lost due to advanced caries, trauma, periodontal disease, or other clinical conditions. Their placement addresses not only aesthetic concerns but also critical oral functions—including mastication, speech, swallowing, and mandibular posture—which, if compromised, may lead to broader health consequences such as malnutrition or temporomandibular joint disorders.
According to guidelines from the World Health Organization (WHO) and major dental associations, tooth replacement is indicated when tooth loss significantly impacts quality of life or oral functionality—always after conservative options to preserve natural dentition have been considered or exhausted.
Classification of Dental Prostheses
Prostheses are broadly categorized into two types, selected based on clinical factors (residual bone volume, condition of adjacent teeth), patient preferences, and socioeconomic considerations:
1. Fixed Prostheses
Permanently cemented or screw-retained onto prepared natural teeth or dental implants. Patients cannot remove them independently.
Main types:
- Crowns: Cover structurally compromised but vital teeth, restoring form and function.
- Conventional bridges: Replace missing teeth by anchoring to adjacent prepared “abutment” teeth, which require reduction to accommodate the prosthesis.
- Maryland bridges: Minimally invasive adhesive bridges, typically used for single anterior tooth replacement without significant tooth preparation (limited to low occlusal loads).
- Inlays/Onlays: Custom laboratory-fabricated restorations for extensive posterior cavities, preserving more tooth structure than full crowns.
- Porcelain veneers: Ultra-thin ceramic laminates bonded to the facial surface of anterior teeth, primarily for aesthetic correction (minor misalignments, diastemas, discoloration).
Materials: Metal-ceramic, zirconia-ceramic, or lithium disilicate (metal-free options offering excellent biocompatibility and aesthetics).
2. Removable Prostheses (Dentures)
Devices the patient can remove for daily cleaning and tissue rest.
- Complete dentures: Replace an entire dental arch, resting on residual alveolar ridges.
- Partial dentures: Replace limited tooth groups, anchored to remaining natural teeth via clasps or precision attachments.
Structure: Acrylic resin base (mimicking gingiva) with artificial teeth made of resin, composite, or ceramic.
Comparative Overview: Benefits and Limitations
| Feature | Fixed Prostheses | Removable Prostheses |
|---|---|---|
| Stability | High, closely resembling natural teeth | Variable; depends on ridge adaptation and fit |
| Masticatory efficiency | Near-complete functional recovery | Reduced (60–70% of natural dentition) |
| Aesthetics | Excellent, highly customizable | Good, but may appear less natural over time |
| Maintenance | Standard oral hygiene (brushing, flossing, interdental brushes) | Daily extraoral cleaning + periodic relining (every 2–3 years) to compensate for alveolar bone resorption |
| Invasiveness | Requires tooth preparation or implant surgery | Minimally invasive |
| Cost | Higher (especially implant-supported) | More affordable |
Clinical note: Removable prostheses require periodic relining because physiological alveolar bone resorption gradually alters ridge contours, potentially causing instability, discomfort, or mucosal irritation if not addressed.
Therapeutic Decision-Making Criteria
Prosthetic selection should follow an individualized, evidence-based approach considering:
- Anatomical conditions: Residual bone quantity/quality, periodontal status of adjacent teeth.
- Clinical indications:
- Veneers are primarily indicated for aesthetic enhancement on sound teeth.
- Conventional bridges are now less frequently used due to implantology’s ability to preserve abutment teeth.
- Removable prostheses remain a valid option when implant placement is contraindicated (systemic conditions, insufficient non-augmentable bone, patient preference).
- Socioeconomic factors: Cost accessibility and patient willingness to commit to long-term maintenance.
Per European Federation of Periodontology (EFP) guidelines, the ideal approach prioritizes preservation of natural dentition whenever clinically feasible; prostheses represent secondary restorative solutions.
Long-Term Care Recommendations
- Fixed prostheses: Meticulous oral hygiene with soft-bristled/electric toothbrushes, interdental brushes, and floss to prevent periodontal disease around abutment teeth.
- Removable prostheses:
- Nightly removal to allow mucosal tissue recovery.
- Daily cleaning with soft brushes and non-abrasive denture cleaners.
- Annual dental check-ups to assess fit and schedule relining when needed.
- Professional recalls: Every 6–12 months to monitor supporting tissues and prevent complications (e.g., denture stomatitis, accelerated bone loss).