In vitro wear of ten universal composites

What is it about?

Objectives: To test wear of 10 universal composites and the antagonist. Null hypothesis: there are no differences in the composite and antagonist wear. Materials and Methods: Flat samples, light cured as of manufacturer’s instructions and polished were made from Admira Fusion (AF), Filtek Supreme Ultra (FS), G-aenial Sculpt (GS), Harmonize (HR), Herculite Ultra (HU), Tetric Evoceram (TE), TPH Spectra (SP) and three Ultradent experimental materials (UPI Exp 1-3) (n = 8), and stored in water for 3 weeks. They were subjected to wear in a chewing simulator (1.2 x 105 cycles, 49 N, 0.7 mm lateral movement, 1 Hz, steatite antagonists (Ø 6 mm), simultaneously thermocycled (5/55°C) every 90 s). The volumetric wear of the composite was measured with a 3D laser scanner) after 5,000, 10,000 then every 10,000, up to 120,000 cycles. The wear of antagonists was measured after 120,000 cycles. Results: From 5,000 – 120,000 load cycles wear was linear. The total volumetric wear of composites was: GS 0.428 ± 0.083 mm3, UPI Exp 3 0.51 ± 0.042 mm3, HU 0.576 ± 0.072 mm3, SP 0.609 ± 0.088 mm3, FS 0.635 ± 0.077 mm3, HR 0.658 ± 0.116 mm3, TE 0.714 ± 0.097 mm3, Ultradent UPI Exp2 0.725 ± 0.132 mm3, UPI Exp 1 0.894 ± 0.278 mm3 and AF 1.578 ± 0.37 mm3. The wear of AF was significantly the largrest (p < 0.0001). GS showed the lowest wear, but shared this position with UPI Exp 3, HU, SP, FS and HR. The total wear of UPI Exp3 was the lowest. Conclusion: The null hypothesis was rejected. Clinical Relevance: Except for AF, wear should be within acceptable limits. Keywords: Dental materials; In vitro; Wear; Composite; Thermocycling.

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