A clinical study of unsuccessful dental implants

We analyzed clinically 36 patients in whom dental implants were unsuccessful. The patients presented for implants treatment at the Department of Oral Surgery, Nihon University School of Dentistry at Matsudo from January 1989 through December 1993.The results were as follows:1. The male: female ratio of the patients was 1: 1 and the largest age group was from 40 to 69 years.2. Type of implant: endosteal implant (31 cases), subperiosteal implant (3 cases), endodontic implant (1 case), endosteal implant and endodontic implant concurrently (1 case).3. Chief complaint: excessive implant mobility (8 cases), gingival swelling (7 cases), occlusal pain (6 cases), spontaneous pain (5 cases).4. Present condition: excessive implant mobility (23 cases), resorption of alveolar bone (17 cases), pus discharge (12 cases), swelling (9 cases), spontaneous pain (9 cases), occlusal pain (7 cases), bleeding (4 cases), paralysis (4 cases).5. Secondary conditions: alveolar ostitis (28 cases), maxillary sinusitis (5 cases), ostitis of the jaw (3 cases), temporomandibular arthrosis (3 cases), paralysis of the inferior alveolar nerve (3 cases).6. Some symptoms developed in 15 patients from immediately after implant operation. In spite of discomfort, implants were used for an average of 5.1 years.