Using Osstell and ISQ values to compare implant performance
Caution has to be used when comparing the ISQ of different implants, especially in in-vitro models with artificial bone. The ISQ is a measurement of the stiffness of the bone-implant interface and the bone stiffness close to the implant, but is also influenced by the distance from bone level to the top of the implant. The ISQ-results from in-vitro tests do not necessarily reflect the in-vivo test result, and especially if the differences are small (<5 ISQ units).
Therefore, Osstell do not recommend or support comparing absolute values between implant types. To make comparisons, Osstell recommend using an in-vivo model and also comparing the relative development of ISQ over time, instead of absolute vales.