Experimental dental bio-adhesives for direct restorations: The influence of PMnEDM homologs structure on bond strength

Objectives The purpose of this study was to evaluate the effect of PMnEDM dental monomer homologs chemical structure on shear bond strength between polymer-based composite and alloy. Methods Four light-cured experimental universal dental bio-adhesives (group codes: A (PMDM), B (PM2EDM), C (PM3EDM), D (PM4EDM)) were preliminarily evaluated with respect to sensitivity to ambient light, curing time, depth of cure, and uncured film thickness according to standardized procedures. Appropriate tests were performed to measure shear bond strength (SBS) of polymer-based composite to cobalt-based alloy with the use of the adhesives investigated. Variability of results was evaluated by use of the coefficient of variation (CV). Results were estimated with the aid of one-way analysis of variance (ANOVA), performed on the logarithmic values, with α = 0.05 significance level. Results All materials passed the requirements according to physicochemical properties. Except for formulation D, all results estimating SBS were positive with respect to standardized requirements. The uppermost mean SBS was achieved for the A adhesive (11.45 MPa) and appeared to be significantly different compared to D one (5.07 MPa) (p = 0.0495). Also the B adhesive, having slightly lower mean SBS value (10.50 MPa) exhibited a significant difference in respect to D one (p = 0.0455). The means for other trial pairs did not differ statistically. Significance The materials here studied might be considered to have a practical use in dental clinics, especially the formulations B and C.