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28.04.2018 | Short Communication | Ausgabe 5/2018

Clinical Oral Investigations 5/2018

Evaluation of implant screw loosening by resonance frequency analysis with triaxial piezoelectric pick-up: in vitro model and in vivo animal study

Zeitschrift:
Clinical Oral Investigations > Ausgabe 5/2018
Autoren:
Makiko Miyashita, Toru Ogawa, Hideki Naito, Aya Shibamoto, Angelina Shuhua Wang, Kenta Shobara, Keiichi Sasaki
Wichtige Hinweise
Makiko Miyashita and Toru Ogawa contributed equally to this work.

Abstract

Objective

The aim of this study was to evaluate implant screw loosening using resonance frequency (RF) analysis with triaxial piezoelectric pick-up in vitro and in vivo.

Methods

For the in vitro experiment, a titanium implant was inserted into a mandibular model. The abutment screws were tightened to 10 N torque and loosened from 0 to 90° for RF measurement using 13 different screw conditions. In the in vivo experiment, three titanium implants were installed in each tibia of a New Zealand white rabbit, and the RF values were recorded after 8 weeks. For the RF analyses, a small 3D accelerometer was mounted rigidly onto the implant abutment, and impulsive vibration was directly applied to the abutment to vibrate the implant in a direction perpendicular to the tibia and implant (x-axis). The y-axis was defined as parallel to the tibia. The RF values of the x- and y-axis directions (RF-X and RF-Y) were used for evaluation.

Results

The RF values significantly decreased according to the degree of screw loosening (p < 0.05, ANOVA). In the in vitro model, RF-Y with x- and y-axis vibrations (RF-Yx and RF-Yy) significantly differed from the initial value at 10 and 15°, respectively (p < 0.05, Dunnett’s test). In the in vivo experiment, the RF-Yy significantly differed from the initial value between 5 and 20° (p < 0.05).

Conclusion

The results suggest that RF analysis with triaxial piezoelectric pick-up can be used to detect implant screw loosening.

Clinical relevance

RF analysis with the triaxial piezoelectric pick-up can be used to detect screw loosening after mounting the superstructure.

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