An endosteal horizontally placed non-crestal dental implant system including at least one dental implant having a proximal end, a distal end, an internal architecture, and a helical thread extending along the outside region between the proximal end and the distal end. The one or more implants are configured to be implanted horizontally or near horizontally by way of a non-crestal approach, into a mandible or maxilla and to engage with bone tissue. The system also includes at least one dental implant abutment having a proximal end for attaching to the said dental implant and a distal end configured for the attachment of a dental prosthesis. A method of diagnosis and treatment of edentulism using the endosteal horizontally placed non-crestal dental implant system is also recited.