Teeth in a day is possible when we do full mouth dental implant. after the surgery if implant torque sufficient dentist will fix the temporary denture on same day. so its called teeth in day. all on four or all on six are another name of full mouth implant surgery. the 1st step will be get the CBCT report of jaw. because to place implant we need certain amount of available bone. once we can check CBCT and bone is available. next step is surgery and you will get temporary denture. after 3 to 4 months of healing.final set of teeth made. for that multiple measurement needs to take. but this all steps are nonsurgical.