What does “Implant stability quotient” mean?
The implant stability quotient (ISQ) is an index that indirectly assesses implant stability through resonance frequency analysis.
How is it expressed?
The response of a measuring component attached to the implant is analyzed and generally expressed as an index from 1 to 100. It is not a percentage of integration with bone. Measurement direction and conditions must be considered.
Clinical context matters beyond a single value
It is used as a reference when monitoring stability during healing and planning prosthesis connection. Changes from placement, pain, movement, and bone and soft-tissue conditions are assessed together. Exceeding a particular number does not justify immediate loading in every case.
A different measurement from insertion torque
Torque measures rotational resistance during insertion, while ISQ is a stability index from resonance frequency analysis. These different methods cannot be directly converted or compared as equivalent numbers. Both support clinical judgment.
Frequently Asked Questions
Does ISQ 70 mean 70% of the implant is attached to bone?
No. ISQ is a stability index expressed through its measurement method, not the proportion of osseointegrated surface or a probability of success.
Can one measurement determine prosthesis timing?
Healing course, clinical condition, and prosthetic forces must be assessed alongside the value. Changes under the same measurement conditions may also be reviewed when needed.
Questions about the implant stability quotient
Learn what the term means and how it relates to your dental condition.
- Sufficient understanding
Is the meaning of the number clear?
Explanation and evidenceISQ is an indirect stability index, not a bone-contact ratio or success rate.
International Congress of Oral Implantologists · Implant Stability Quotient - A choice suited to your condition
What conditions are needed to connect the prosthesis?
Explanation and evidenceStability data, bone and soft tissues, the bite, and prosthesis design are assessed together to set loading timing.
International Team for Implantology · Loading Protocols for Single Implants
