Effect of Er:YAG Laser and Reduced Time of Acid Etching on Bond Strength of Self-adhesive Resin Cement to MTA and Biodentine

Abstract

Introduction: Considering the recent trend to use mineral trioxide aggregate (MTA) and Biodentine and resin cements, more conservative approaches concurrent with adequate bond strength have always been requested. The present study aimed to evaluate the effect of pretreatment with Er:YAG laser etching versus acid-etching for 5 and 15 seconds on the micro shear bond strength of self-adhesive resin cement (SRC) to MTA and Biodentine. Materials and Methods: Forty-eight samples of each cement (MTA and Biodentine) were prepared and distributed into four groups based on surface pretreatment: 1) control, no treatment; 2) Er:YAG laser etching with energy of 60 mJ; 3) 5-second acid-etching; 4) 15-second acid-etching. All specimens were cemented using SRC. Microshear bond strengths were tested following 24-hour water storage. Debonded specimens were examined and surface topography was assessed using an atomic force machine (AFM). Data analysis was performed using the two-way ANOVA and Tukey multiple comparisons test. Results: The three testing groups of laser etch and 5-s and 15-s acid-etch demonstrated a significantly higher SBS than the control group (P<0.05) with negligible differences among them (P > 0.05). Furthermore, Biodentine showed better adhesive bonding than MTA in all groups. Conclusion: Laser etching of 60 mJ and 5-s acid-etching were as beneficial as 15-s acid-etching in terms of bond strength of SRC to MTA and Bodentine.

Fabrication of Ag Complexes Based on Multidentate Ligands toward High-Efficient and Facile Electroless Plating

“…Hollow structures and hydrophilic groups (−OH, −COOH) are established on the substrate surface after etching, which could absorb catalytic particles by means of coordinate bonds, thus improving the adhesion. However, most substrates are perishable once exposed to etching solution; − as a result, a new surface pretreatment process will be researched for its resistance to deformation after immersing in etching solution. In addition, the CrO 3 /H 2 SO 4 micro-erosion system is used in industrial production, which causes persistent pollution to the environment and is highly carcinogenic to the health of the body, which then limit this technology’s green development. − To overcome the issue, the introduction of a modified layer is an ideal choice to be utilized to establish the hydrophilic group for adsorbing catalyst particles on the substrate surface.…”

“…However, most substrates are perishable once exposed to etching solution; − as a result, a new surface pretreatment process will be researched for its resistance to deformation after immersing in etching solution. In addition, the CrO 3 /H 2 SO 4 micro-erosion system is used in industrial production, which causes persistent pollution to the environment and is highly carcinogenic to the health of the body, which then limit this technology’s green development. − To overcome the issue, the introduction of a modified layer is an ideal choice to be utilized to establish the hydrophilic group for adsorbing catalyst particles on the substrate surface. Sun et al, Chang et al, Wang et al, Gui et al, and Huang et al reported that metal particles could be ECP deposited on the substrate surface by a modified, adsorbed, and plated process.…”