Resonance frequency analysis (RFA) is a method used to determine stability (the level of osseointegration) in dental implants. The stability is presented as an implant stability quotient (ISQ) value. The higher the ISQ value the higher the stability. Resonance frequency analysis (RFA) is a method used to determine stability (the level of osseointegration) in dental implants. The stability is presented as an implant stability quotient (ISQ) value. The higher the ISQ value the higher the stability.