MDI Hospital: Trenton Health Center. Health (5 days ago) 394 Bar Harbor Road Trenton, ME 04605 667-5899.Hours: Monday 8:00 am - 7:00 pm Tuesday - Friday 8:00 am - 5:00 pm. For after-hours and weekend inquiries, please call your health center to speak to our response center to have an on-call provider return your call.. Mdihospital.org.