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Analysis of major mode of vibration of a RFA based dental implant stability measuring sensor with varying length of L arm

Measurement of stability of dental implant can be quantitatively and non-invasively done by Resonance Frequency Analysis (RFA) method. This study uses the RFA method with a shift in measurement paradigm from identification of system resonances to system anti-resonances from impedance phase responses. RFA method requires a sensor, which typically comprises of a piezo element and a metal substrate attached to it, as also taken in the present study. The metal substrate has one arm, which is circular shaped with same diameter as the piezo and is attached to it. It has another perpendicularly extended rectangular arm, referred to as the L arm. The free end of the L arm has a groove to hold the implant. This sensor is excited with an external sinusoidal voltage of 1 Volt p-p and 1 to 20 kHz variable frequency, over a suitable period of time for measuring the dynamically changing dental implant stability. It has been seen that, the recorded impedance responses have changing modes of vibration. These changes depend on various parameters among which the length of the L arm plays a significant role. This study focuses on the analysis of the change in the major mode of vibration in static responses due to the change in the length of the L arm, while the other constructional features remain unaltered. An effective length of the L arm, which provides maximum antiresonance phase, has been recommended for subsequent use in practical applications in this study.