Table 2. The characterization of the 6 failed implants.

Patient No./Sex	Age (yr)	Failure				Delayed placement	External sinus floor elevation	Final prosthetic restoration	Other implants in the patient
		Time (mon)	Reason	Position	Size (mm)				Survived	Total
2/F	62	2	Failed osseo-integration	26	4.5×15	Yes	Algipore® and autologous bone	No	9 (Full success)	10
11/M	57	2	Failed osseo-integration	42	3.8×11	No	No	No	3 (Stable, 1–1.5-mm bone loss)	5
				32
14/M	58	3	Chronic bacterial infection	31	3.4×13	No	No	No	3 (All satisfactory)	4
23/F	50	65	Peri-implant disease	25	3.8×18	Yes	Algipore® and autologous bone	Fixed single crown	9 (3-mm bone loss for implant at position), 26 (Other 8 satisfactory)	10
25/M	57	85	Peri-implant disease	16	3.8×15	Yes	Algipore® and autologous bone	Fixed bridge	9 (>3-mm bone loss for implant at position), 17 (Other 8 successful)	10

F, female; M, male.