Three-body Wear Behavior of a New Self-adhesive Universal Resin Cement

One major trend in luting ceramic inlays today is to simplify the luting procedure. RelyX Unicem^R was introduced for luting adhesive inlays without any pre-treatment of dental hard tissues. Objectives: The aim of the present study was to evaluate the wear behavior of RelyX Unicem^R in comparison to three conventional resin luting cements and one glass ionomer cement (GIC).

Methods: Sixty Class I CEREC^R inlays (Vita-Mark^R II) were adhesively inserted into cavities having been placed in IPS Empress^R samples to simulate surrounding enamal. The luting materials were (n = 10 per group): RelyX Unicem^R auto cure (U-auto), RelyX Unicem^R dual cure (U-dual), Compolute^R (CL), Panavia^R F (Pan), Variolink^R II Low (VL), and Fuji Cem^R (FC). Wear was simulated by the ACTA method (DeGee 1986). 3D-measurements of the specimens were carried out with a profilometer (Perthen S3P) after 200.000 cycles. The average widths and the average depths of the luting gaps were evaluated by the software XPert^R for Windows.

Results: After 2 x 10⁵ cycles the following average luting space wear rates were detected [µm] (SD):

                        U-auto            U-dual            CL                  Pan                 VL                   FC

Width              190 (50)         175 (43)         179 (74)         220 (73)         194 (54)         167 (41)

Depth             23 (10)           17 (4)             15 (3)             17 (3)             15 (4)             32 (11)

Conclusions: There were no significant differences in luting gap width (ANOVA, mod. LSD, p>.05). The highest wear rates were calculated for GIC FC and the U-auto (p<.05). All other materials exhibited no significant differences (p<.05). For luting of adhesive inlays with RelyX Unicem^R we recommend additional light-curing.