Dental OSCE (Objective Structured Clinical Examination) Practice Exam

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What type of fluoride should NOT be used by a patient wearing PFM crowns?

Rectified fluoride
Acidulated phosphate fluoride
Sodium fluoride
Stannous fluoride

The correct answer is: Acidulated phosphate fluoride

When considering the types of fluoride and their compatibility with porcelain-fused-to-metal (PFM) crowns, it's essential to understand the properties of each fluoride option. Acidulated phosphate fluoride should not be used by patients with PFM crowns. This is primarily due to the acidic nature of this fluoride formulation, which can etch or damage the porcelain component of the crowns. The acid can create surface roughness or micro-cracks, leading to aesthetic concerns or compromised durability of the crown. In contrast, other fluoride options like sodium fluoride and stannous fluoride do not have the same erosive potential and can be safely used around PFM crowns without negatively affecting their integrity. Rectified fluoride, which is essentially a safe version of sodium fluoride, also does not pose a risk to the crowns. Thus, the choice of fluoride is significant in maintaining not only the health of the teeth but also the longevity and appearance of dental restorations like PFM crowns. Therefore, acidulated phosphate fluoride is contraindicated in this scenario.