Dental OSCE (Objective Structured Clinical Examination) Practice Exam

What is the cement of choice if the tooth receiving a PFM crown is sensitive to cold?

1. Resin cement

2. Glass Ionomer

3. Composite resin

4. Resin-modified glass ionomer

The correct answer is: Glass Ionomer

Choosing glass ionomer cement as the material for attaching a PFM (Porcelain-Fused-to-Metal) crown in a tooth that is sensitive to cold is a well-founded decision driven by the properties of the cement. Glass ionomer cement is known for its ability to release fluoride, which can contribute to a reduction in sensitivity and help in remineralizing the tooth structure. This is particularly beneficial for teeth with pulpal sensitivity or existing recession, as fluoride can enhance the health of the surrounding dentin and enamel. Moreover, glass ionomer cement has a thermal expansion coefficient that is more compatible with tooth structure compared to other cements. This property helps to create a stable bond and reduces the likelihood of post-operative sensitivity, especially in response to thermal stimuli. The material is also biocompatible and adheres well to moist dentin, making it an ideal choice when there is concern for pulp health or when the tooth exhibits sensitivity. In contrast, while options like resin cement and composite resin offer strong bonding capabilities, they do not possess the same fluoride release characteristics that are beneficial for managing sensitivity. Similarly, resin-modified glass ionomer cement does offer some advantages, but when considering a primary choice for a tooth exhibiting sensitivity, glass ionomer's