From: Reducing the risk of impaired bone apposition to titanium screws with the use of fibroblast growth factor-2−apatite composite layer coating
Threshhold setting in bone apposition rate
Probability of impaired bone formation
FGF(−)
FGF(+)
≤68.82%
0.1
0.002
≤63.75%
0.05
3.5 × 10−4
≤50%
0.005
1.4 × 10−6