Evaluation of the Bond Strength of Self-Etching Adhesive Systems Containing HEMA and 10-MDP Monomers: Bond Strength of Adhesives Containing HEMA and 10-MDP

Abstract

The aim of this in vitro study was to assess the bond strength of self-etching adhesives containing HEMA and 10-MDP monomers. Twenty-four bovine teeth were divided into three groups. Two cylinders of composite resin were made in each tooth (n = 16): G1-Prime and Bond Universal (control); G2-OptiBond All-in-One (HEMA); and G3-Clearfil SE (10-MDP and HEMA). After 24-hour storage in distilled water, the specimens were fixed to a universal testing machine (Kratos Equipamentos Ltda.) for the microshear test at a speed of 0.5 mm/min. A qualitative analysis of the fracture pattern was also performed using scanning electron microscopy (500× magnification). The normality of sample data distribution was determined using the Shapiro–Wilk test. The results were assessed using the Kruskal–Wallis test, and α level of 5% was used for the analysis. The results indicated a statistical difference ( p > 0.05 ) between G3 (15.6080 MPa) and G2 (11.2180 MPa). No statistical difference was observed when G1 (14,6325 MPa) was compared with the other two groups. It was also observed that a mixed fracture pattern was predominant in all groups. The self-etching adhesive containing HEMA and 10-MDP monomers showed to be promising in increasing the bond strength between the dental substrate and the composite resin, whereas the adhesive containing only HEMA exhibited lower bond strength to dentin.

Effect of Modified Triple-Layer Application on the Bond Strength of Different Dental Adhesive Systems to Dentin

“…In the case of using the MTLA, the functional monomers inside CSE, which are considered as adhesion promoters, will affect the stability of the bond with time. The hydrophilic characteristic of these monomers, like HEMA, raises the dentinal bond strength of the adhesives, and some functional monomers such as 10-MDP could bond chemically to calcium [42], while as advocated in the scientific literature, 10-MDPcontaining SE adhesives have better bond durability [43]. This was only observed in the current study when the A technique was used.…”

Shear bond strength of universal adhesives to human enamel and dentin

“…3 HEMA is a small hydrophilic monomer that promotes penetration of other monomers into dentin tubules and additionally serves as solvent. 17,18,22 After other solvents such as acetone, isopropanol, or ethanol evaporate, the remaining water in the adhesive tends to separate the adhesive's components, which reduces its effectiveness. 17,18 This effect has been observed for GB in a previous study.…”

“…For HEMA‐free adhesives such as GB and PB, a reduced bond strength has been reported in several studies, 25,26 which may be caused by the missing solvent effect of HEMA 3 . HEMA is a small hydrophilic monomer that promotes penetration of other monomers into dentin tubules and additionally serves as solvent 17,18,22 . After other solvents such as acetone, isopropanol, or ethanol evaporate, the remaining water in the adhesive tends to separate the adhesive's components, which reduces its effectiveness 17,18 .…”

“…In addition, manufacturers of universal adhesives use different combinations of components; therefore, the available adhesives are difficult to compare. A tendency has been observed for higher shear bond strength to enamel and dentin with MDP‐containing universal adhesives than for those without MDP 21–23 . For adhesives without the potentially allergenic monomer HEMA 24 lower bonding durability was reported 25–27 .…”

“…A tendency has been observed for higher shear bond strength to enamel and dentin with MDPcontaining universal adhesives than for those without MDP. [21][22][23] For adhesives without the potentially allergenic monomer HEMA 24 lower bonding durability was reported. [25][26][27] Nevertheless, there is a lack of studies comparing the shear bond strengths of the different available universal adhesives.…”