Implant Micro-Geometry
The microscopic surface features of a dental implant, such as roughness, porosity, and topography, engineered to enhance cell adhesion and promote osseointegration.
Full Definition
Implant micro-geometry refers to the surface-level structural characteristics of an implant at the micron and sub-micron scale, typically produced through sandblasting, acid-etching (SLA), oxidation, or laser ablation. Surface roughness is characterised by parameters such as Ra (average roughness) and Sa (areal surface roughness). An optimum surface roughness of 1–2 µm is widely cited to promote osteoblast attachment and bone apposition. Micro-geometry is distinct from surface chemical composition and coating, though the two are often modified simultaneously. Editors should watch for authors conflating surface treatment processes (e.g., SLA) with the resulting micro-geometric properties.
Usage
Usage note: Distinguish from 'surface coating' (e.g., hydroxyapatite); micro-geometry refers to physical topography, whereas coating refers to chemical surface modification.
In Context
- "The SLA surface produces a micro-geometry characterised by a mean Ra value of approximately 1.7 µm." — Materials science research article
- "Micro-geometry modifications were credited with the accelerated osseointegration observed in the test group." — In vitro study