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

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**Case Summary** ■Product Name: Simcenter Femap with 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 tip attached to the horn's end 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 shape of the tip, and the bonding conditions between the device's components also affect the vibration characteristics. High-frequency vibrations generate harmonics in addition to the fundamental wave, which can increase amplitude, leading not only to metal fatigue and damage of components but also potentially increasing patient 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 tip shapes. □ For other functions and details, please refer to the catalog.

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