INBDE (Integrated National Board Dental Examination) Practice Exam

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This type of ultrasonic uses vibrations in a linear pattern.

  1. Magnetostrictive

  2. Sonic

  3. Piezoelectric

  4. Optic

The correct answer is: Piezoelectric

Piezoelectric ultrasonics use crystals that expand and contract when an electric current is applied, creating vibrations in a linear pattern. This linear pattern of vibration allows for efficient removal of calculus and debris from teeth and dental restorations. Magnetostrictive ultrasonics, on the other hand, use a stack of metal strips that change shape when a magnetic field is applied. Sonic instruments do not involve the use of crystals or magnets for vibration. Optic instruments utilize light for visualization and illumination, not vibrations, making them unrelated to the linear pattern of ultrasonic vibrations described in the question.