Primary stability and why it determines what happens that day
Primary stability is the mechanical grip the implant achieves against the surrounding bone the moment it is placed. It is measured at placement using insertion torque (in Newton centimetres) and can be checked with resonance frequency analysis to give an ISQ value.
Higher torque values give the clinician confidence the implant will not move during early healing. As a general benchmark, primary stability of 30 to 35 Ncm and above is widely accepted for standard placement, with higher thresholds (often 45 Ncm and above) typically required before any temporary crown can be fitted on the same day. Where primary stability falls below the threshold the clinician considers safe for the implant system in use, loading is delayed and the implant is allowed to integrate under a healing cap. These figures reflect ranges reported in the implant literature; the right threshold for any individual case depends on bone density, implant design, and site location.
The longer explanation of how do implants fuse with bone covers the biology of titanium-bone integration on a dedicated science page.
Ask whether this treatment fits your case.
