Table 6 Survival and failure criteria, according to the health scale for dental implants [21]

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