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Correct Answer: glass ionomer cement is nonirritating.
the question asks which property of glass ionomer cement is similar to that of zinc polycarboxylate cement. to answer this, it is important first to understand the properties of both materials. glass ionomer cement is widely used in dentistry for its good adhesion to dental tissues and its release of fluoride, which can help in preventing further decay. zinc polycarboxylate cement is also used in dentistry, particularly known for its ability to adhere to enamel and dentin.
among the properties listed, the one that stands out as a common feature between glass ionomer cement and zinc polycarboxylate cement is that both are nonirritating to the dental pulp. this is a crucial quality because it ensures that the material can be used safely in a range of dental treatments without causing inflammation or harm to the pulp tissue, which contains nerves and blood vessels. this biocompatibility is essential for materials used in fillings, linings, and luting cements, where close contact with the pulp is often inevitable.
the other properties mentioned, such as being pigment producing, radiopacity resistance, and thermally expansive, do not align directly with the known attributes of zinc polycarboxylate cement. for instance, pigment production is not a typical or desired property of dental cements. radiopacity is a property that allows materials to be distinguishable under radiographic examination, and while it is a valuable property, it is not unique or particularly characteristic of zinc polycarboxylate cement compared to other dental materials.
lastly, thermal expansion in the context of dental materials generally refers to how much the material expands or contracts in response to temperature changes. this property is critical since materials that expand too much can cause damage to the surrounding dental tissues or lead to loss of the restoration. however, this is not a defining comparative property between glass ionomer and zinc polycarboxylate cements.
thus, the shared property of being nonirritating to the pulp between glass ionomer cement and zinc polycarboxylate cement is the correct answer to the question. both materials are valued in dentistry for minimizing the risk of post-operative sensitivity and maintaining the health of the pulp after dental procedures.
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