Influence of the use of modeling liquids on the properties of direct resin composites

Abstract

Objective: To evaluate in vitro the influence of different modeling liquids and adhesives on the physicochemical and biological properties of three commercial resin composites.

Methods: Three resin composites will be used (Z250xt - 3M ESPE, Tetric N Ceram - Ivoclar, Llis - FGM), distributed into four experimental groups: control (with conventional handling), use of a specific modeling liquid (Modeling Resin - BISCO), total-etch adhesive (Tetric N Bond - Ivoclar), and self-etch adhesive (Tetric N Bond Universal - Ivoclar). Flexural strength will be assessed following ISO 4049 guidelines through a three-point bending test using a universal testing machine. Color stability will be analyzed by measuring color variation with a spectrophotometer (Vita Easy Shade) before and after coffee immersion. Water sorption and solubility will be evaluated according to ISO 4049, and biocompatibility will be assessed via an MTT assay on 3T3 fibroblasts following ISO 10993-5.

Expected Results: It is expected that the adhesive systems will negatively affect the mechanical and biological properties of the resin composites, reducing their strength and biocompatibility. In contrast, the use of a specific modeling liquid will not produce significant changes compared to the control group.