Implant Stability Quotient (ISQ): A Reliable Guide for Implant Treatment

Implant stability is a prerequisite for successful dental implants and osseointegration. To determine the status of implant stability, continuous monitoring in an objective and qualitative manner is important. To measure implant stability two different stages are there: Primary and secondary. Primary implant stability at placement is a mechanical phenomenon that is related to the local bone quality and quantity, the type of implant and placement technique used. Primary stability is checked from mechanical engagement with cortical bone. Secondary stability is developed from regeneration and remodeling of the bone and tissue around the implant after insertion and affected by the primary stability, bone formation and remodeling. Implant stability is essential for the time of functional loading. Classical benchmark methods to measure implant stability were radiographs or microscopic analysis, removal torque, push-through and pull-through but due to lack of feasibility, time consumption and ethical reasons other methods have been propounded over period of time like measurement of implant torque, model analysis and most important ISQ which has the ability to monitor osseointegration and the life expectancy of an implant. ISQ is a valuable diagnostic and clinical tool that has far-reaching consequences on implant dentistry and this article throws light on advanced and reliable methods of assessing ISQ.