From: In vitro and in vivo accumulation of magnetic nanoporous silica nanoparticles on implant materials with different magnetic properties
Cluster size
Quantity
None (0)
Occasional (1–5)
Few (≤ 20)
Many (≤ 100)
Plentiful (> 100)
Very small
0
1
2
3
5
Small
4
6
Medium
7
Large
8
Very large
9