📞 03606 613679 📍Petristraße 6, 37308 Heilbad Heiligenstadt

Zinc oxide phosphate cement (Harvard)

Zinc oxide phosphate cement (Harvard)


  • definitive, non-adhesive cementing of restorations
  • Underfills, build-up fillings, temporary fillings


  • Powder: approx. 80% zinc oxide, 10% magnesium oxide & additives for firmness & oral stability
  • Liquid: phosphoric acid, water, ion additives (e.g. zinc, reduce reaction speed)
  • The surface of the alkaline powder is dissolved through the acidity of the liquid 
  • The reaction is exothermic (heat is generated)

Advantages  and disadvantages


  • good mechanical properties
  • offers good insolation against chemical, thermal, bacterial influences (underfilling)
  • easy to process & affordable
  • easy removal of excess cement because there is no chemical connection to the tooth
  • quite thin, which enables a good fit of the restoration


  • when setting, pH drops to 3.5 (MILLER 1997) ², which can lead to an acid shock for pulp, which is why pulp protection is recommended; pH is only neutral again after 48 hours
  • Dentures stick to the abutment tooth only through physical wedging effect, which is why a preparation is smoothed but not polished³ (AYAD et al. 1997)
  • relatively soluble in the oral environment


  • Powder & liquid are mixed in portions and with light pressure in the appropriate ratio
  • Setting time up to 8 min
  • Reseal powder & liquid immediately as liquid pulls water & powder can accumulate with CO2, which makes the cement porous
  • longer setting time by mixing on a cooled glass plate (Voß and MEINERS 1989).
  • shorter processing and setting time
    • high ambient temperature
    • quick powder addition
  • Powder-rich mixtures give the best results, since the oral resistance increases with the amount of powder.


  1. Breustedt A: Lehrmaterialien für das Selbststudium auf dem Gebiet der stomatologischen Werkstoffkunde, Humbold-Universität Berlin, 1964.
  2. Miller M: Befestigungszemente - Indikation und Alternativen. Phillip Journal 14 (1997) 385-386
  3. Ayad MF, Rosenstiel SF, Salama M: Influence of tooth surface roughness and type of cement on retention of complete cast crowns. J Prosthet Dent 77 (1997) 116-121.
  4. Voß R, Meiners H: Fortschritte der Zahnärztlichen Prothetik und Werkstoffkunde, Band 4, Hanserverlag, 1989, 394- 408.

Hinterlasse einen Kommentar

Bitte beachten Sie, dass Kommentare vor der Veröffentlichung freigegeben werden müssen