Polyacrylic cement (carboxylate cement)

Indication

• Underfills
• Definitive fixing for dental Resorations

Composition

• Powder: main part zinc oxide, then aluminum oxide & magnesium oxide & additives
• Liquid: polyacrylic acid solution when setting, the carboxyl groups of polyacrylic acid are linked by zinc & magnesium, which leads to shrinkage!

Advantages & Disadvantages

Advantages

• chemical connection with hard tooth substance (via carboxyl groups) (JANDA 1996) ¹
• good pulp tolerance, since pH only drops briefly high tensile strength

Disadvantages

• Shrinkage that continues for a long time
• high viscosity, which is why too much liquid is often added (high dosing sensitivity)
• They have a lower strength compared to Zinc oxide phosphate cement (NAUMANN 2000) ².

References

1. Janda R: Zahnärztliche Befestigungsmaterialien. Dent Echo 1 (1996) 36-38.
2. Naumann M: Kleben oder Zementieren? Zahnärztl Prax 4 (2000) 298- 308