Which option is NOT a listed cause of powered instrument tip breakage?

• A. Using the right tip for the deposit
• B. Excessive pressure
• C. Incorrect angulation
• D. Prolonged use without rest

Answer: (A)

Tip breakage from powered instruments happens mainly when technique places excessive stress or heat on the vibrating tip. Excessive pressure increases bending and fatigue on the tip as it contacts calculus or the tooth surface, raising the chance of fracture. Incorrect angulation can cause the tip to bind or be driven at an improper angle, loading the tip in ways that promote breakage. Prolonged use without rest leads to overheating and metal fatigue, weakening the tip over time. Using the right tip for the deposit, however, is not a cause of breakage—properly selecting and using the correct tip reduces stress and helps prevent breakage.