Can my dentist charge me a cancellation fee?

I paid substantial amount for a dental implant two weeks ago and the appointment is in five days time. I am going to cancel this appointment because I have found a dentist that has more expertise in this field and am more confident with him. I will be giving the first dentist 4 days notice of the cancellation of the appointment. Will he return all my payment or hold some back for cancellation? I have already paid for the cat scan ($600) – will he give the cat scan to me to give to the new dentist?