Resonance frequency analysis with two different devices after conventional implant placement with ridge preservation: A prospective pilot cohort study

Joost E. I. G. Brouwers*, Sharon Buis, Philip G. de Groot, Bas de Laat, Jasper A. Remijn

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review


Background Primary and secondary implant stability is of high importance for survival and success of dental implants in the short and long term. Measurements of implant stability during healing provide the opportunity to monitor the course of the osseointegration process. Purpose To compare implant stability quotient (ISQ) by resonance frequency analysis (RFA), recorded with two different devices after implant placement. Materials and methods Patients with the need of single tooth extraction in posterior sites of the maxilla and the mandible were treated in a surgical center. All patients received additional augmentation with a bovine bone substitute and platelet-rich fibrin (PRF) after atraumatic tooth extraction. After a healing period of 10 weeks, 28 self-tapping titanium-implants were placed. Implant stability was recorded with two different devices (Osstell and Penguin) at the time of implant insertion (T0), 10 days later (T1), and after 7 (T2), or 17 weeks (T3). Results No implant was lost, and no postoperative complication occurred during follow-up. Patient cohort comprised 9 female (32.1%) and 19 male patients (67.9%), with a mean age of 52.8 years, 64.3 years, respectively. Mean overall insertion torque was 43.6 Ncm at implant placement with no significant difference between implant location, age, or gender. No patient dropped out. During observation period, a significant increase in mean ISQ was recorded with both devices. Significant positive correlations between insertion torque and ISQ were recorded with both devices at T0, T2, and T3. No significant differences were observed in ISQ-values between both devices, and measuring directions at any point of measurement. Conclusions Within the limitations of this cohort study, both devices were suitable for RFA-measurement and revealed comparable results. Due to the cordless design, handling of the Penquin device was more comfortable. Reusability of the Penguin MultiPeg-transducers may offer an additional benefit with regard on ecological aspects.

Original languageEnglish
Pages (from-to)789-799
Number of pages11
JournalClinical Implant Dentistry and Related Research
Issue number5
Early online date26 Jul 2021
Publication statusPublished - Oct 2021


  • implant stability quotient
  • insertion torque
  • osseointegration
  • platelet-rich fibrin
  • resonance frequency analysis
  • ridge preservation

Cite this