Wear resistance of self-adhesive and universal resin luting cements.

PURPOSE: To compare the wear resistance of conventional self-adhesive resin luting cements with that of recently developed universal resin luting cements under both dual-cure and chemical-cure conditions, and to evaluate the influence of mixing method (hand-mix or auto-mix).

METHODS

Five resin luting cements were evaluated: three universal cements [G-Cem One EM (GUA) and RelyX Universal (RUA) auto-mix types, and G-Cem One neo (GUH) hand-mix type) and two conventional self-adhesive cements (Clearfil SA Luting Multi in hand-mix (SH) and auto-mix (SA) forms, and RelyX Unicem 2 (RA) auto-mix type]. Wear resistance was assessed using an Alabama wear-testing machine. Volume loss (mm³) and maximum facet depth (µm) were measured after wear testing. Statistical analyses were performed to compare differences among materials, curing modes, and mixing methods.

RESULTS

The volume loss ranged from 0.054-0.167 mm³ and the maximum facet depth ranged from 99.6 to 222.7 µm. Significant differences were observed among the resin luting cements and between dual-cure and chemical-cure conditions. However, no significant differences were found between curing conditions within the universal resin luting cements. Additionally, no significant differences were identified between the hand-mixed and auto-mixed versions of the same or similar materials.

CLINICAL SIGNIFICANCE: Wear resistance was strongly material dependent, but universal resin luting cements showed no influence of curing mode. A universal resin luting cement with good wear resistance may be a good option when restorative margins are difficult to illuminate.