Implant Stability Change Measurement of Flaplessly Placed Immediate Implant on Mandibular First Molar

This study aims to evaluate the stability change of implants placed immediately after extraction of the mandibular first molar with Resonance Frequency Analysis (RFA). Materials and Methods:For 24 patients, 25 implants with sandblasted, large grit, and acid-etched (SLA) surface were placed with flapless surgery.Implant stability at implant placement and impression taking procedure were measured with Osstell ISQ.The average interval between implant placement and impression taking was 1.82 months, and implants' success rate was 100%.The average follow-up period was 23.8 months. Results:The average RFA value of implants measured in all directions increased by 6.4, and the average RFA value measured in the buccolingual direction increased by 5.9.Moreover, the average RFA value measured in the mesiodistal direction increased by 6.9.There was a statistically significant difference between the buccolingual side' s RFA value and the RFA value in the mesiodistal side at implant placement.There was not a completely linear relationship between the RFA value at implant placement and insertion torque. Conclusion:The change of RFA value can be a useful evaluation method for implant stability of the immediately placed implant after tooth extraction.It may help evaluate the healing of immediately placed implant and determine the appropriate loading time.