Zyl (cellulose acetate) frames are best adjusted using which method?

Zyl (cellulose acetate) frames are best

Multiple choice — select the best answer

ACold bending only
BWarm air or salt pan heating
CPliers applied cold
DUltrasonic bath

✓ Correct answer: B. Warm air or salt pan heating Zyl frames must be heated before adjustment to prevent cracking or breaking. A warm-air frame heater or salt pan softens the material so it can be bent without damage.

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Zyl (cellulose acetate) frames are best adjusted using which method?

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