Primary Stability
The mechanical anchorage of a dental implant achieved at the moment of surgical placement, determined by bone quality, quantity, and surgical technique.
Full Definition
Primary stability refers to the immediate resistance to micromovement of a dental implant fixture within its osteotomy site at the time of insertion. It is a mechanical phenomenon dependent on the density and volume of the surrounding bone, the implant's macro-geometry (thread design, diameter, length), and the precision of the surgical drilling protocol. High primary stability is a prerequisite for immediate or early loading protocols. It is typically quantified using insertion torque values and resonance frequency analysis. Editors should distinguish this term from secondary stability, which develops biologically through osseointegration.
Usage
Usage note: Do not conflate with 'secondary stability'; the two represent distinct phases of implant integration and should not be used interchangeably.
In Context
- "The surgeon noted excellent primary stability at 45 Ncm insertion torque, supporting an immediate loading protocol." — Operative report
- "Primary stability is reduced in patients with low-density (Type IV) bone, necessitating a conventional healing period." — Clinical review article