Time frame: 6, 12, 18, and 24 months post-implantation.
The percentage of functional implants in each cohort meeting the 2007 International Congress of Oral Implantologists (ICOI) Pisa Consensus Conference Health Scale criteria. Multiple clinical/radiographic parameters (pain, mobility, bone loss, exudate) are aggregated to classify each implant into a single category: Group I (Success: no pain/mobility, <2mm bone loss, no exudate); Group II (Satisfactory Survival: no pain/mobility, 2-4mm bone loss, no exudate); Group III (Compromised Survival: potential sensitivity, no mobility, >4mm bone loss [<50% of implant body], pocket depth >7mm, potential exudate); or Group IV (Failure: pain, mobility, bone loss >1/2 implant length, or uncontrolled exudate).
To arrive at the single reported value, data are aggregated by calculating the combined percentage of implants classified into Group I and Group II out of the total implants evaluated in each cohort.