[Case Study] Dental Instruments - Vibration Characteristics Simulation of Ultrasonic Scalers

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**Case Overview** ■Product Name: NX Nastran ■Analysis: Modal Analysis, Frequency Response Analysis ■Industry: Other The subject of this analysis is an ultrasonic scaler for dental treatment, and its structure is shown in the right diagram. The ultrasonic vibrations generated by the transducer are amplified by the horn and transmitted to the chip attached to the horn's tip screw, delivering impacts of several hundred micrometers in amplitude at approximately 30,000 times per second to the teeth. This is an effective method for dental treatment that is quiet and causes minimal discomfort. The resonant frequency varies depending on the chip shape, and the bonding conditions between the device's components also affect the vibration characteristics. In high-frequency vibrations, harmonics other than the fundamental wave are generated, which can increase the amplitude and lead to metal fatigue or damage to the components, as well as potentially increase the patient's pain. FEM simulation is effective for such vibrations that cannot be visually confirmed. This case study investigated the vibration characteristics of ultrasonic scalers with various chip shapes. □ For other functions and details, please refer to the catalog.

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