Which type of dental cement has the smallest film thickness?

Zinc phosphate cement is known for its exceptionally low film thickness, making it an excellent choice in situations where a precise fit is critical, such as in the cementation of crowns and bridges. Its small film thickness allows for a strong bond without interfering with the seating of restorations. This quality also contributes to the material's durability and overall performance in the oral environment.

In contrast, while glass ionomer and zinc polycarboxylate cements are also used widely in dentistry, their film thickness tends to be slightly greater than that of zinc phosphate. Compomers, which are hybrids of glass ionomer and composite resin, have a larger film thickness due to their composition designed for specific indications like anterior restorations. Therefore, zinc phosphate cement stands out as the material with the smallest film thickness among those listed.