Reaction of Dental Zirconia with Phosphate-Bonded Investments for Heat Pressing Technique


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The aim of the study was to investigate the reaction of phosphate bonded investment to zirconia during for the heat-pressing technique. Two kinds of dental zirconia were used in this study (inCoris ZI and P-NANOZR). Zirconia was invested into the three kinds of phosphate-bonded investment (Ceravety, PC-15 and Norivest). The investments were fired at several different temperatures. The X-ray diffraction peaks due to monoclinic ZrO2 were not detected on the waxed-up side of zirconia discs. It demonstrates that no low temperature degradation occurred during the heating of the investment. X-ray diffractometry revealed that the peak assigned to ZrP2O7 was detected on the contact side of zirconia discs fired with phosphate-bonded investment at 850 and 950°C. It also revealed that diffraction peak assigned to YPO4 and the monoclinic ZrO2 were detected in the same side of zirconia discs contacted with phosphate-bonded investment fired at 1100 °C. It can be concluded that the reduction of Y caused the transformation from tetragonal to monoclinic phase and the reduction of strength.



Key Engineering Materials (Volumes 529-530)

Main Theme:

Edited by:

Kunio Ishikawa and Yukihide Iwamoto




K. Yoshihara et al., "Reaction of Dental Zirconia with Phosphate-Bonded Investments for Heat Pressing Technique", Key Engineering Materials, Vols. 529-530, pp. 537-542, 2013

Online since:

November 2012




[1] Anusavice KJ. Science of dental materials. 11th ed. W.B. Saunders Company; (2003).

[2] Nakajima H. The chemical adhesive phenomenon of phosphate bonded investment components. The Journal of the Japanese Society for Dental Materials and Devices 1985; 4: 199-204.

[3] Ban S. Reliability and properties of core materials for all-ceramic dental restrations. Japanese dental Science Review 2008; 44: 3-21.


[4] Okuda Y, Noda M, Tsuruki J and Ban S. Property change of dental zirconia with contamination during final fireing. Archives of BioCeramics research 2010; 10: 70-73.