 - For edentulous participants without existing implant therapy: Diagnosis of type 2 diabetes mellitus occurring more than 1 year prior to enrollment self-reported and verified with physician report, test results, andor treatment record or healthy, non-diabetic with a HbA1c 6.0, or either FPG 100 mgdl or an OGTT 140 mgdl 2 hr within 11 months prior to surgery; participants must have complete maxillary and mandibular dentures determined to be clinically acceptable by study dentists; and must have an identified need for 2-implant supported mandibular overdenture using standard diameter Straumann 4.1 mm implants. 