Influence of storage on the mechanical properties of resin cements

0188 Influence of storage on the mechanical properties of resin cements

E. MAGNI¹, N. ILIE², R. HICKEL³, and M. FERRARI¹, ¹University of Siena, Italy, ²Ludwig-Maximilians University Munich, Germany, ³Ludwig-Maximilians-University, Munich, Germany

Objectives: To assess the mechanical properties of three resin cements after different storage conditions. Methods: Fifteen 4mm×4mm×2mm specimens were prepared with PanaviaF2.0 (Kuraray Co.), Corecem (RTD) and RelyXUnicem (3M ESPE) and light-polymerized for 30s. Five specimens of each cement were stored at 37°C in one of the following conditions: dry, deionised water or mineral oil. Modulus of elasticity (E), elastic work (We/Wtot), creep (Cr) and Vicker's hardness (VH) of each cement were measured 24h and 1month after storage. The mechanical properties measured 15min after polymerization served as control. Measurements were performed with a microhardness indenter (FischerscopeH100C, Fischer). Data were analyzed with a Multivariate ANOVA and Tukey's test (α=0.05). Results: The cement resulted as a significant factor affecting mechanical properties (p<0.001), time and storage condition affected the properties except of VH (p=0.56) and We/Wtot (p=0.431) respectively. The Table reports the measured mechanical properties. Conclusion: The tested cements exhibited different susceptibility of their mechanical properties to storage conditions over 1month.

Cement

Property

Storage

Control

dry

oil

water

24h

1month

24h

1month

24h

1month

PanaviaF2.0

E(GPa)

4.50(1.19)^b

6.57(0.93)^de

5.22(1.80)^bc

7.57(1.52)^ef

6.10(1.48)^cd

6.66(0.70)^de

2.97(0.75)^a

We/Wtot(%)

31.60(2.49)^ab

30.29(2.12)^a

34.31(4.47)^bc

31.05(3.94)^a

35.19(5.36)^c

28.95(4.74)^a

36.57(1.55)^c

Cr(%)

4.44(0.31)^gh

4.89(0.27)^jk

5.07(0.50)^k

4.73(0.22)^ij

4.61(0.39)^hi

4.83(0.49)^ijk

4.97(0.41)^jk

VH(N/mm²⁾

13.82(4.81)^a

21.00(3.58)^b

20.81(4.78)^b

25.95(3.58)^b

24.79(9.11)^b

20.97(5.99)^b

10.05(3.94)^a

Corecem

E(GPa)

9.91(0.39)^ij

10.06(0.28)^jk

9.75(0.84)^ij

9.40(0.42)^ghij

8.80(0.93)^ghi

8.26(0.43)^fg

8.58(0.72)^fgh

We/Wtot(%)

50.13(0.91)ⁱ

49.82(0.92)^hi

51.06(1.14)i

49.31(0.87)^ghi

51.09(0.71)ⁱ

50.47(1.59)ⁱ

51.39(4.02)ⁱ

Cr(%)

3.75(0.08)^de

3.58(0.06)^bcd

3.69(0.16)^cde

3.79(0.15)^de

3.85(0.20)^e

3.90(0.17)^e

4.27(0.35)^fg

VH(N/mm²⁾

64.48(5.46)^fg

63.25(2.53)^efg

65.83(5.63)^g

58.84(3.35)^def

57.97(5.41)^de

54.36(3.65)^cd

62.16(13.57)^efg

RelyXUnicem

E(GPa)

14.78(1.30)^mn

15.61(2.19)ⁿ

12.56(1.86)^l

14.40(1.00)^m

10.23(1.55)^jk

11.09(2.38)^k

9.48(0.80)^hij

We/Wtot(%)

46.83(1.78)^efg

46.69(3.20)^efg

47.27(3.42)^fgh

44.77(1.30)^def

46.58(3.80)^ef

44.25(3.70)^de

42.96(1.66)^d

Cr(%)

3.48(0.17)^bc

3.18(0.15)^a

3.75(0.20)^de

3.42(0.18)^ab

4.16(0.16)^f

3.78(0.17)^de

4.61(0.27)^hi

VH(N/mm²⁾

87.85(6.14)ⁱ

92.60(6.21)ⁱ

79.26(9.34)^h

81.43(5.25)^h

63.12(4.41)^efg

62.30(5.29)^efg

50.95(5.59)^c

Table: Means(SD) of the mechanical properties. Different superscript letters indicate significant differences(p<0.05).

Seq #19 - Materials Properties
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