Table 6.

Survival and failure criteria, according to the health scale for dental implants [21]

Categories	Criteria
Success	a) No pain or tenderness upon function
	b) No mobility
	c) < 2 mm radiographic bone loss from initial surgery
	d) No exudate history
Satisfactory survival	a) No pain on function
	b) No mobility
	c) 2–4 mm radiographic bone loss
	d) No exudate history
Compromised survival	a) May have sensitivity on function
	b) No mobility
	c) Radiographic bone loss > 4 mm (less than 1/2 of implant body)
	d) Probing depth > 7 mm
	e) May have exudate history
Failure	Any of the following:
	a) Pain on function
	b) Mobility
	c) Radiographic bone loss > 1/2 length of implant
	d) Uncontrolled exudate
	e) No longer in mouth