[Study on the expansion properties of homemade fast investment material for the IPS-Empress2 castable ceramic].
IPS-Empress2 is a successful all-ceramic restoration system. To lower its cost, and promote its application, a kind of homemade fast investment material has been developed. The aim of this study was to evaluate the expansion properties of this investment material. The setting expansion, thermal expansion and total expansion of the homemade fast investment material were tested. The same properties of the IPS special fast investment material were also tested as control. Then the SPSS statistics software was used to evaluate the differences between the homemade material and the special material. The results show that the setting expansion rate, thermal expansion rate and total expansion rate of the special investment material for IPS-Empress2 are 0.858%, 1.11% and 1.17% respectively, while the same parameters of the homemade investment material are 0.798%, 1.09% and 1.16% respectively. There is no statistically significant difference in these expansion properties between the two investment materials. In conclusion, the expansion properties of homemade fast investment material are comparable to those of the special fast investment material, so it can compensate for the cast contraction of IPS-Empress2 castable ceramic precisely.
He
Gang
G
West China College of Stomatology, Sichuan University, Chengdu 610041, China.
Liao
Yunmao
Y
Cen
Yuankun
Y
D000538:Aluminum Silicates / Q000138:chemical synthesis* / Q000737:chemistry; D003442:Crowns; D003764:Dental Materials / Q000138:chemical synthesis* / Q000737:chemistry; D003776:Dental Porcelain / Q000138:chemical synthesis* / Q000737:chemistry; D018020:Lithium Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D013499:Surface Properties; D013718:Tensile Strength
D000538:Aluminum Silicates; D003764:Dental Materials; C118557:Empress 2; C075815:IPS-Empress ceramic; D018020:Lithium Compounds; D003776:Dental Porcelain