Nano-Hardness of Adhesive Interface between Er:YAG Laser-Irradiated Dentin and 4-META/MMA-TBB Resin

Abstract

Objective: The purpose of this study was to evaluate the hardness of the adhesive interface between resin and Er:YAG laser-irradiated bovine dentin by nano-indentation. Background Data: It has been reported that laser output energy and pulse repetition rate affect the tensile bond strength in Er:YAG laser-irradiated dentin.

Mechanical properties of the bond interface associated with nd:yag laser

“…The third null hypothesis was rejected, because the present study proved this superiority of the hybrid layer when compared with the adhesive layer with regards to the harness values, corroborating the findings of other authors [14,33,34]. The hardness and modulus of elasticity of a material mainly depend on its density and chemical composition, characteristics that may be altered when changes in its structure occur, or due to heat or mechanical treatments to which the material is submitted [35].…”

Effects of Er,Cr:YSGG laser parameters on dentin bond strength and interface morphology

“…In previous studies, it was reported that Er,Cr:YSGG laser irradiation yielded significantly lower dentin bond strength when compared to conventional means, even though the laser was used according to the parameters suggested by the manufacturers (Adebayo et al, ; Cardoso et al, ; Carvalho et al, ). However, it was reported that erbium laser irradiation might reduce nano‐hardness of dentin (Aizawa et al, ). Therefore, assessment of the precise laser parameters to decrease peripheral thermo‐mechanical damage to a minimum is particularly crucial for long‐lasting resin composite restorations.…”

Resin Bonding to Erbium Laser-Irradiated Tooth Structures

“…Peritubular dentin is more prominent than intertubular dentin. No signs of melting or carbonization were seen Fig.4 Cross-sectioned SEM photomicrograghs of 4-META/ MMA-TBB resin-dentin interface after being decalcified and deproteinized 42) . (a) Unlased dentin.…”