The different thicknesses of HA layer have been analyzed
from 0 to 210 mm. According to the results, the minimum of
the stress concentration was 20.3 MPa when we have nano-Ti
implant covered by 180 mm HA layer which is the best thickness
because low stress concentration leads to longer implant
life and faster bone regeneration. Using HA coating, we will
have higher stability of the implant; however the long-term
clinical successes need to be examined further.