Objectives: The aim of this in-vitro study was to examine the temperature dependence of the storage modulus of dental veneering composites.

Materials and Methods: Rectangular specimens (height: 2mm, width 2mm, length 20mm) were made of the following dental veneering composites: Adoro (Ivoclar-Vivadent, FL), Belleglass (Girrbach, G), Conquest Sculpture (Jeneric&Pentron, USA), Dialog (Schütz Dental, G), Epricord (GC, J), Sinfony (3M Espe, G), Solidex (Shofu Dental, G) and Thermoresin (GC, J). All materials were prepared according to the manufacture's instructions with the recommended curing devices. The temperature dependent storage modulus (E' [MPa]) was determined with a dynamic mechanical analyzer (DMA 242, Netzsch, G) under air atmosphere. The specimens were subjected to a temperature program between 0°C to –100°C to 200°C with a cooling/heating rate of 10K/min. All samples were loaded with a sinusoidal oscillation of 5, 10 and 20 Hz. From the results mean and standard-deviation was calculated and statistical analysis was performed (One-way ANOVA; p=0.05). The results at 0°C, 25°C, 37°C and 55°C are shown.

Results:

	Adoro	Belleglass	Conquest	Dialog	Epricord	Signum	Sinfony	Solidex	Thermoresin
E'0°C	10823± 124	17431± 826	16067± 3375	12861± 2653	8460± 2395	7333± 1700	8438± 1639	7854± 736	6099± 758
E'25°C	9717± 346	15275± 88	13118± 2528	10240± 2030	7138± 2424	5612± 1467	6353± 1722	6579± 373	4603± 507
E'37°C	9123± 155	14584± 45	11727± 2284	9090± 1802	6526± 2294	4865± 1366	5268± 1589	5989± 309	4209± 520
E'55°C	7996± 62	13349± 515	9723± 2088	6736± 1459	5453± 2068	3760± 1195	3601± 1293	5004± 202	2802± 381

Conclusion: The lowest storage modulus was found for Thermoresin, the highest results for Belleglass. In the clinical operative temperature range between 0°C and 55°C all materials showed a decrease of storage modulus with increasing temperature.

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