Eidgenössisches Examen Zahnmedizin Practice Questions - Eidgenössisches Examen Zahnmedizin Examen Fédéral De Médecine Dentaire Esame Federale Di Medicina Dentaria Exam

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A 28-year-old competitive swimmer presents with extensive cupping of the cusp tips and loss of surface anatomy on the palatal surfaces of the maxillary incisors and occlusal surfaces of first molars. The patient reports frequent consumption of isotonic sports drinks and lemon-infused water. What is the critical pH threshold below which dental enamel hydroxyapatite undergoes active chemical dissolution in the oral environment, compared to fluorapatite?

Hydroxyapatite dissolves below pH 6.8, whereas fluorapatite dissolves below pH 6.2 Hydroxyapatite dissolves below pH 6.0, whereas fluorapatite dissolves below pH 5.5 Hydroxyapatite dissolves below pH 4.0, whereas fluorapatite dissolves below pH 3.5 Hydroxyapatite dissolves below pH 5.5, whereas fluorapatite dissolves below pH 4.5

Correct Answer:

Hydroxyapatite dissolves below pH 5.5, whereas fluorapatite dissolves below pH 4.5

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