Which of the following is a contraindication for ultrasonic use?

• A. COPD or asthma (due to aerosols and airway irritation)
• B. Recurrent headaches
• C. Hypertension
• D. Diabetes

Answer: (A)

The main idea is that ultrasonic devices used in dental or similar settings can generate aerosols that may irritate the airways. For someone with COPD or asthma, these aerosols can trigger coughing, bronchospasm, or worsen breathing problems, making COPD or asthma a contraindication to using ultrasonic equipment. Other conditions listed do not inherently forbid ultrasonic use; they may require basic precautions, but they are not absolute contraindications. If necessary, alternatives or additional infection-control measures can be considered to protect patients with respiratory issues.