Effect of curing mode on micro tensile bond strength of resin composite cements
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Abstract
Objectives: To investigate the micro-tensile bond strength (μTBS) to dentin of resin composite cements in different curing modes.
Materials and Methods: The μTBS of three resin composite cements—Panavia V5 (PV), Panavia SA Universal (SA), and RelyX Universal (RXU)— bonded to dentin were tested in two curing modes. PV was evaluated in auto polymerization (AA) and co-curing (AL) modes, while SA and RXU were tested in AL and separate light-curing (LL) modes. Failure modes were analyzed by light microscopy and SEM. Data were analyzed using one-way ANOVA and Tukey’s post hoc test (p<0.05).
Results: PV had the highest bond strength, with no significant difference between AA and AL modes. In contrast, SA and RXU showed significantly lower μTBS in AL than LL. High rates of pretesting failures and adhesive failure modes were observed in the co-curing groups of SA and RXU. SEM analysis revealed voids and signs of water infiltration at the adhesive-dentin interface.
Conclusion: Co-curing adhesive-assisted resin composite cements (SA, RXU) significantly reduced bond strength. Primer-assisted resin composite cement (PV) maintained high bond strength across both curing modes.
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