What is implant torque and stability (ISQ)?
ISQ (implant stability quotient) is a numerical measurement of how firmly a dental implant has anchored into the jawbone, assessed via resonance frequency analysis to determine if it can safely support a crown.
Implant stability quotient (ISQ) quantifies the mechanical and biological stability of a dental implant within the jawbone using resonance frequency analysis. A dentist or surgeon attaches a small transducer to the implant and measures the frequency at which it vibrates, producing a score between 0 and 100. Higher ISQ values indicate firmer integration and greater resistance to micro-movement.
ISQ matters because it signals when an implant is ready to bear the load of a crown or bridge. Implants with low ISQ scores at placement may require a longer healing period before the crown goes on, reducing the risk of implant failure. Most clinicians prefer ISQ values of 60 or higher before commencing crown fabrication, though the exact threshold depends on bone quality and implant position.
The measurement takes seconds and causes no discomfort to the patient. It eliminates guesswork about whether osseointegration (bone bonding to the implant surface) is sufficient. Some dental offices track ISQ over weeks or months to monitor healing trends. When ISQ remains low or declines, it may signal complications such as bone loss or infection that need intervention.
For patients seeking implant dentistry specialists in Chicago, understanding ISQ helps explain why your dentist may recommend different loading timelines and why stability assessment is a routine part of implant care, not an upselling tactic.