klein gordon equation造句

• We know that schrodinger equation is associated with a non relativistic single particle, moving onto relativistic description of the single particle, we get klein gordon equation and then modified dirac equation . Now in QFT, when we quantise the field we see that both Klein gordon n dirac pictures get modified to many particle picture and also a single particle state is described by the field . so my question is do we discard the wave associated with the particle here as given by schrodinger equation ( as here we r associating a field with single partice ) . if not, then also how do we get to know that is it a wave or field assocaited with the single particle . if the answer is that the particle is relativistic then it is field associated with it n if it is non relativistic then a wave is associated with it.