Summary of studies which used PRP in its inactive form.
|Nikolidakis et al. (2006) , Nikolidakis et al. (2008) ||CaP + Ti implants||8–12 × 105/L ||Significantly increased bone contact percentage with Ti + PRP (liquid) implants |
Significantly higher endosteal bone formation length in CaP + PRP (gel) coated implants
|Yun et al. (2013) ||HA + BMMSCs + Ti implants||Adjusted to 1 × 106/L||No significance found|
|Chang et al. (2009) ||HA/collagen type I bone graft formation||9.25–12.5 × 105/L ||Significant bone tissue in HA/collagen + PRP (liquid injection)|
|Han et al. (2009) ||DBM + active versus inactive PRP||8x over baseline*||PRP (liquid) significantly increased osteoconductivity of DBM |
Note (*) that the study by Han et al.  did not give exact platelet counts.|