The effect of mechanical and chemo-mechanical temporary cement cleaning methods on shear bond strength with self-adhesive resin cement (an in-vitro study)

Abstract

Background Adhesive tooth-colored restorations are strongly dependent on the substrate surface cleanliness to allow intimate contact between resin cement and dentin surface, so several methods were adopted for the total cleaning of temporary cement residues. This study aimed to assess the effect of mechanical and chemo-mechanical cleaning methods of temporary cement on the immediate shear bond strength of self-adhesive resin cement to dentin surface. Methods Forty freshly extracted lower first premolars were cut to expose a flat dentin surface. Discs of temporary crown composite resin material were constructed and cemented to the flat dentin surface using resin-based and non-eugenol temporary cement then stored at room temperature in distilled water. Dividing of samples into two groups according to the method of temporary cement cleaning. Group I (n = 20) mechanical cleaning using the rotary instrument, and group II (n = 20) chemo-mechanical cleaning using chlorhexidine-containing scrub. CAD/CAM reinforced Composite discs were bonded to the dentin surface using self-adhesive composite resin cement, then measurement of shear bond strength was done using a universal testing machine. Further analysis of failure mode after debonding was performed by Scanning electron microscope. Results No statistically significant difference was found between the mean shear bond strength of the two cleaning methods (P-value = 0.636). Regardless of the cleaning method, the group cemented with resin-based temporary cement showed statistically significantly higher mean shear bond strength than non-eugenol temporary cement (P-value = 0.048). Conclusion Both cleaning methods (mechanical and chemo-mechanical) applied in this study were effective in cleaning temporary cement remnants from the dentin substrate surface with statistically significant differences between results of shear bond strength with significantly higher values recorded with resin-based temporary cement.

Effect of the prism-interprisms three-dimension spatial microstructure on the enamel bond strength

“…Regarding the limitations of the present study, more newer version self-etching adhesive or etch and rinsed adhesive were not investigated. Additionally, other variables have been demonstrated in to have an influence on bond strength of composite materials, such as the application of bleaching agents [ 37 ], fluorides [ 38 ], cleaning methods [ 39 ] and substrate contamination [ 40 ]. Therefore, enamel three-dimension spatial microstructure should be evaluated in the future also in combination with these variables.…”

Enhancing the durability and antibacterial activity of glass ionomer restorative material enriched L-arginine and Nano-titanium for pit and fissure sealing

“…By dividing the highest ultimate load to failure (N) by the bonded cross-sectional area (mm 2 ), machine software (BlueHill 3, Instron, England) computed the average bond strength (MPa). Means and standard deviations were recorded [35].…”