Perry Raz*1; Haya Meir2; Shifra Levartovsky3; Maia Peleg4; Alon Sebaoun1; Ilan Beitlitum5

1Department of Periodontology and Dental Implants,, The Maurice and Gabriela Goldschleger School of Dental Medicine, The Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.; 2Department of Periodontology and Oral Implants; 3Department of Oral Rehabilitation,, The Maurice and Gabriela Goldschleger School of Dental Medicine, The Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.; 4Dental School, The Maurice and Gabriela Goldschleger School of Dental Medicine, The Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; 5Department of Periodontology and Oral Implants,, Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel, Tel Aviv, Israel

Background: Implant primary stability is a critical prerequisite for the immediate loading. The primary stability can be evaluated by insertion torque (IT). A non-invasive method to assess implant stability has been developed on the basis of resonance frequency analysis . RFA is measured by means of the Osstell or Penguin. The value is translated into an index called - Implant stability quotient (ISQ). The correlation between IT and ISQ is still unclear which could create miscommunication among dentists.

Aim/Hypothesis: To evaluate the correlation between IT and ISQ in two type of stability devices in vitro model and to evaluate how the initial stability of implants varied depending on different implant design and length as well as bone quality

Material and Methods: 96 implants of two different implant designs (CC:conical connection, IH:internal hexagon) with lengths of 13 mm and 8 mm were inserted by a surgical motor into synthetic foam blocks. The peak IT and ISQ measurements of each implant were analyzed. Initial measurements were recorded at the point when implant insertion was stopped by the insertion tool, and final measurements were recorded when the implant was completely inserted.

Results: Reproducible measurement can be expected with the IT of the surgical motor and for the Osstell and Penguin. Generally, a positive significant correlation was found between the IT and the Osstell and Penguin values in the initial and final measurements. Implant length did not affect the correlation by the different RFA devices. The correlation between the different implant design types revealed that in the CC design, the correlation between the RFA devices was maintained, but in the IH implant design, the correlation between Osstell and Penguin was high and positive only in the initial and final measurements. In the IH implant design, no correlation was observed between IT and Osstell or between IT and Penguin.

Conclusion and Clinical implications: In our model, there is a high correlation between IT and ISQ. Bone type does not affect the high positive correlation between the initial and final Osstell and Penguin measurements. Implant length does not affect the correlation between the primary stability measurements by the different RFA devices. Implant design affects the correlation between IT and ISQ, which is maintained at both initial and final measurements in the CC implant design and only at the final measurement in the IH design.

Disclosure of Interest: None Declared.

Keywords: dental implants, implant stability, resonance frequency analysis