Overview
Mini dental implants (MDIs) typically measure 1.8–2.9 mm in diameter, compared with the 3.5–5.5 mm range of standard implants. They are appropriate for some clinical situations and a poor substitute in others. The most common appropriate use is retention of a lower complete denture in patients who cannot tolerate standard surgery or grafting.
Where MDIs are reasonable
- Stabilising a lower complete denture in a thin alveolar ridge.
- Transitional anchorage during longer treatments.
- Patients with significant medical comorbidities for whom larger surgery is risky.
- Anchoring small orthodontic forces (temporary anchorage devices — TADs).
Where MDIs are usually a mistake
- Single-tooth molar replacement under heavy occlusal load.
- Aesthetic-zone single-tooth replacement (insufficient bulk for emergence profile).
- Cantilevered bridges.
- As a low-cost substitute for proper implant therapy in normal anatomy.
What the evidence shows
For mandibular overdenture retention, MDI survival is broadly comparable to standard implants in selected cohorts. For single-tooth and bridge support, particularly in posterior load-bearing positions, fracture rates rise substantially and long-term survival is lower than for standard-diameter implants[1].
Frequently asked questions
Scientific references
- 1. Moraschini V, Poubel LA, Ferreira VF, Barboza ES. (2015). Evaluation of survival and success rates of dental implants reported in longitudinal studies with a follow-up period of at least 10 years: a systematic review. Int J Oral Maxillofac Surg. 44(3):377-88. View source