He can go for implants directly, don't have to go for temporary dentures... Go for implants those are the strongest and the best option for replacement of teeth.... Going for Dentures and then for implants, don't have to spend for the both... Spend for implants and do the best treatment....
Next Steps
You need to take x-rays like opg... Consult your Dentist... If your father is Diabetic or taking tablets for anyother medical problems.. Take the reports and have a consult with your Dentist..