IADR Abstract Archives
Elemental composition of representative types of investment materials
Objectives: The aim of this study was to examine the composition of four different types of commercially available investment materials.
Methods: Two silica based phosphate-bonded investments for dental alloys (FujiVest Super specially recommended for quick-heating procedures and Stellavest for conventional heating process), PressVest for pressable ceramics and Rematitan Ultra for cpTi castings were included in this study. The elemental composition of specimens tested was determined by Low Vacuum SEM/x-ray EDS microanalysis. The results were statistically analyzed by one way Anova and SNK multiple comparison test at a=0.05.
Results: The results of elemental analysis (wt%) are demonstrated in the following table. Table. Elemental composition of the materials tested (n=5, mean values with standard deviations in parenthesis). Mean values with the same capital letter did not show statistical significant differences (p>0.05)
|
Element |
Fujivest Super |
PressVest |
Stellavest |
Rematitan Ultra |
|
44.79(1.23)A |
45.49(1.98)A |
54.09(2.45)B |
35.19(1.86)C |
|
|
Si |
36.31(0.98)A |
42.12(1.05)B |
30.78(1.32)C |
0.58(0.06)D |
|
P |
6.28(0.26)A |
3.42(0.96)B |
3.29(0.79)B |
0.08(0.02)C |
|
Mg |
4.77(0.12)A |
2.85(0.50)B |
5.42(0.18)C |
25.35(0.67)D |
|
N |
3.23(0.08)A |
2.24(0.42)B |
3.52(0.51)A |
|
|
Zr |
3.13(0.31)A |
|
0.59(0.08)B |
3.55(0.42)A |
|
Al |
0.13(0.18)A |
0.41(0.36)A |
0.17(0.05)A |
26.24(1.06)B |
|
Ca |
0.26(0.08)A |
0.27(0.10)A |
0.03(0.09)B |
0.74(0.05)C |
|
Ti |
|
1.87(0.55) |
|
|
|
Na |
0.20(0.12)A |
0.09(0.08)A |
0.27(0.10)A |
0.21(0.09)A |
|
C |
0.91(0.53)A |
1.14(0.83)A |
1.84(0.38)A |
5.18(0.17)B |
|
F |
|
|
|
2.90(0.23) |
|
S |
|
0.10(0.10) |
|
|
Fujivest Super showed significant differences from Stellavest (except from N, Al Na and C). The high concentration of P in Fujivest Super may be added to accelerate the setting mechanism as both investments are phosphate bonded. PressVest showed significantly higher concentration for Si compared to FujiVest and PressVest probably in order to withstand the mechanical and thermal stresses developed during casting of ceramic material. In contrast Rematitan Ultra has traces of Si to avoid the contamination of Ti during casting.
Conclusion: The investment materials tested showed significant differences in their elemental composition a finding that is implicated with their physical, thermal and mechanical properties.