Question 259 · LDEK · Etiology and pathogenesis of caries
Changes in plaque pH following a rinse with a glucose solution were first observed by Stephan. How much time the acid plaque takes to return to its normal pH values in the region of 7?
- A. 1 - 2 minutes.
- B. 5 - 10 minutes.
- C. 15 - 20 minutes.
- D. 30 - 60 minutes.
- E. 70 - 90 minutes.
Hint
Recall the shape of the Stephan curve: a rapid drop within minutes, then a much slower recovery due to salivary buffering.
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