Implant or Partial Maxillary Denture at 18 years of age?

by sue wilson
(WA australia)

My son had an accident on a trampoline when he was 8 years of age. Tooth 21 was exfoliated and tooth 11 suffered severe enamel and dentine fracture. The exfoliated tooth was reinserted.

Over the years we have had reabsorbtion of the tooth through the apex, root canal treatment, and orthadontic treatment. He has now at the age of 17 had this tooth removed and is wearing a false tooth incerted in a retainer as a temproary measure.

Regarding an implant:
He is turning 18 on 19/4. Is he too young for a permanent implant to be fitted? What is the life-span? Approximate cost?

Regarding a Partial Maxillary Denture:
What is your opinion on a Partial Maxillary Denture-Resin Base to be fitted? What is the life-span? Is this comfortable and easy to clean? Does it affect the other adjacent teeth?
Is there any other option we should be considering?
Thanking you for your advise