Abstract
In this laboratory study shear bond strengths of three filled and one unfilled adhesive systems to enamel and dentine were compared. Forty-eight extracted intact noncarious human mandibular molars were randomly assigned to two groups of 24 one for bonding to enamel and the other for bonding to dentine. Buccal and lingual surfaces of each tooth were randomly assigned for application of each one of filled (Prime & Bond NT (PBNT), Optibond Solo Plus (OBSP), and Clearfil SE Bond (CSEB)) and unfilled (Single Bond (SB)) adhesive systems (n = 12). A universal resin composite was placed into the translucent plastic cylinders (3 mm in diameter and 2 mm in length) and seated against the enamel and dentine surfaces and polymerized for 40 seconds. Shear bond strength was determined using a universal testing machine, and the results were statistically analyzed using two-way ANOVA, one-way ANOVA, t-test, and Tukey HSD post hoc test with a 5% level of significance.There were no statistically significant differences in bond strength between the adhesive systems in enamel, but CSEB and SB exhibited significantly higher and lower bond strength to dentine, respectively, than the other tested adhesive systems while there were no statistically significant differences between PBNT and OBSP.
Highlights
Dentine bonding systems continue to be developed at a rapid rate [1]
Maximum and minimum shear bond strength values in enamel groups were found in Prime & Bond NT (PBNT) (22.74 ± 4.45 MPa) and Clearfil SE Bond (CSEB) (18.84 ± 4.31 MPa) groups, respectively
One-way ANOVA revealed no significant differences in shear bond strength values between adhesive systems in enamel (P = 0.127), but shear bond strength values were significantly different in dentine group (P < 0.001)
Summary
Dentine bonding systems continue to be developed at a rapid rate [1]. Satisfactory bonding to enamel can be achieved using the acid-etching technique [2], but dentine bonding is more difficult to achieve due to the wet tubular structure, permeability properties, and organic composition of dentinal substrate [3]. There has been increasing interest in the incorporation of fillers into dentine adhesive systems, but the importance of filler particles is somewhat controversial [4, 5]. These fillers may include from conventional glass or silica fillers to nanometer-sized aerosil silica [6]. If the addition of fillers prevents the adhesive from adapting optimally to the etched enamel and dentine surface and exposed collagen fibers, a suitable hybrid layer may not form [12], compromising bond strength and marginal integrity [13]. Inclusion of fillers in dentine adhesives increases their viscosity that tends to prevent overthinning of unfilled adhesive layers, thereby preventing incomplete
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