The existing records of a private practice limited to the practice of periodontology were reviewed to locate patients who had been diagnosed with peri-implantitis (failing dental implant) and had been surgically treated utilizing enamel matrix derivative (Commercially available FDA product Emdogain sold by Straumann USA). Various clinical factors were gathered from the existing records. Some of the factors recorded were: retention of the implant, presence of bleeding, presence of further damage, and presence of inflammation. All patients had signed an informed consent for treatment and the anonymous use of their data for research purposes. All HIPA requirements were followed.

See brief summary.

Inclusion Criteria:

• all adult patients of record who presented with existing peri-implantitis that was clinically deemed treatable (the implant was not considered hopeless.)

Exclusion Criteria:

• none except for routine medical contraindications for periodontal surgery

Routine adult patients in a private periodontal practice.