Question 204 · LDEK · Other
Dysfunctions and parafunctions are listed among the main environmental causes of malocclusion. Which of the following activities is a dysfunction?
- A. unwillingness to chew hard food.
- B. sucking a thumb.
- C. nail biting.
- D. gnashing of teeth.
- E. lip sucking.
Hint
A dysfunction is abnormal performance of a physiological function, whereas a parafunction has no physiological purpose.
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