Three body wear of luting composites

Objectives: The three-body wear of luting materials was simulated with the ACTA machine and compared with a conventional composite.


Methods: Luting composites included light-curing (Variolink Estetic LC) and dual-curing composite materials (Variolink Esthetic DC, Multilink Automix, Panavia V5 paste). The composite Tetric EvoFlow was used as a reference material. The luting composites (N=4) were filled into the 20 chambers of the ACTA sample wheel and light-cured for 40s.
Three-body wear was simulated with the ACTA machine. A millet seed suspension was used as abrasive food slurry. The samples were subjected to 200,000 cycles of three-body wear with a contact force of 15N between the opposing surfaces. The difference of the surface speed (slip) between the antagonist and sample wheels was was 15 %. The abrasive was renewed every 50000 cycles. The wear was measured with a 3D scanner (LaserScan3D/Willytec/Munich/Ger). The data were evaluated with the Match3D software and statically analyzed (R CRAN, ANOVA, Post-hoc-Test:Tukey, p<0.05).

Results: After 200,000 cycles, the average wear was in the range of 32.2-27.2µm. Luting materials tested differed in running-in wear, but showed no significant differences in subsequent cycles. The wear rate was comparable. The most important results are summarized in the table.

Conclusions: Luting materials did not differ significantly. Since all materials have similar wear resistance, it is recommended to refer to the dual luting materials (Variolink Esthetic DC, Multilink Automix, Panavia V5 paste) for restorations with a thicker layer thickness.