Table 4.

Health Scale for Dental Implants by Misch classification [28].

Implant quality scale (Group)	Clinical conditions
Group I. Success (optimum health)	A. No pain or tenderness upon function B. No mobility C. <2 mm radiographic bone loss from initial surgery D. No exudates history
Group II. Satisfactory survival	A. No pain on function B. No mobility C. 2–4 mm radiographic bone loss D. No exudates history
Group III. 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 exudates history
Group IV. Failure (clinical or absolute 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