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What is the best choice of cement for cementing a lower fixed bilateral holding arch in place?
Zinc phosphate cement
Glass ionomer (GI) cement
Resin cement
Calcium hydroxide cement
The correct answer is: Glass ionomer (GI) cement
Glass ionomer (GI) cement is the best choice for cementing a lower fixed bilateral holding arch in place. This is because GI cement is strong, adhesive, and biocompatible, making it suitable for dental use. It also releases fluoride, which helps prevent tooth decay. Zinc phosphate cement (A) may be too acidic and can irritate the pulp tissue. Resin cement (C) is strong but may not bond well to the arch, leading to dislodgment. Calcium hydroxide cement (D) is not as strong as GI cement and may not provide enough retention.