Research and EducationInfluence of an iodonium salt on the properties of dual-polymerizing self-adhesive resin cements
Section snippets
Material and Methods
The dual-polymerizing self-adhesive resin cements used in this study were RelyX U100 (3M ESPE) and BisCem (Bisco Inc). The compositions of the materials are presented in Table 1. DPIHFP (Aldrich Chemical Co) was used without further processing. A light-emitting diode unit (Radii Cal; SDI Ltd) with an output intensity of 1200 mW/cm2 was used for activation, and the output intensity was measured with a radiometer. The experimental groups were set according to the molar concentration of DPIHFP
Results
Push-out bond strength results are presented in Figures 1 and 2. For RelyX U100, the control group showed the lowest mean bond strength ±standard deviation at 4.8 ±2.3 MPa, and the group with 0.5 and 1 mol% presented the highest at 8.5 ±3.5 and 6.7 ±3.8 MPa, respectively. Adhesive cement/dentin failure was the most observed mode in all groups, but adhesive cement/post failure was also detected. For BisCem, the 0.5 mol% group showed a higher bond strength (7.4 ±3.2 MPa) than the 1 mol% group
Discussion
The incorporation of DPIHFP in dual-polymerizing self-adhesive resin cements improved the degree of conversion and push-out bond strength and decreased the polymer degradation in the solvent and the swelling coefficient of the materials tested. The increased reactivity of these cements with the addition of DPIHFP is related to the low bond energy of the carbon–iodine bond (26 to 27 kcal/mol), which facilitates the decomposition of the excited iodonium compound to an anion, an aryl radical, and
Conclusions
The addition of 0.5 mol% DPIHFP improved the physical properties of dual-polymerized self-adhesive resin cements, increasing the degree of conversion, push-out bond strength, and microhardness.
References (39)
- et al.
Compatibility between dental adhesive systems and dual-polymerizing composite resins
J Prosthet Dent
(2016) - et al.
Microhardness of dual-polymerizing resin cements and foundation composite resins for luting fiber-reinforced posts
J Prosthet Dent
(2014) - et al.
Bond strengths, degree of conversion of the cement and molecular structure of the adhesive-dentine joint in fibre post restorations
J Dent
(2012) - et al.
An in situ evaluation of the polymerization shrinkage, degree of conversion, and bond strength of resin cements used for luting fiber posts
J Prosthet Dent
(2016) - et al.
Kinetics of polymerization and contraction stress development in self-adhesive resin cements
Dent Mater
(2012) - et al.
Effect of chemical structure on degree of conversion in light-cured dimethacrylate-based dental resins
Biomaterials
(2002) Hygroscopic and hydrolytic effects in dental polymer networks
Dent Mater
(2006)- et al.
Effects of water content and initiator composition on photopolymerization of a model BisGMA/HEMA resin
Dent Mater
(2008) - et al.
Effect of photoinitiators on the in vitro performance of a dentin adhesive exposed to simulated oral environment
Dent Mater
(2009) - et al.
Effects of functional monomers and photo-initiators on the degree of conversion of a dental adhesive
Acta Biomater
(2012)
Polymerization kinetics and reactivity of alternative initiators systems for use in light-activated dental resins
Dent Mater
The initiating radical yields and the efficiency of polymerization for various dental photoinitiators excited by different light curing units
Dent Mater
Influence of photoinitiator type on the rate of polymerization, degree of conversion, hardness and yellowing of dental resin composites
Dent Mater
Onium salt improves the polymerization kinetics in an experimental dental adhesive resin
J Dent
Improved polymerization efficiency of methacrylate-based cements containing an iodonium salt
Dent Mater
A mechanistic and laser flash photolysis investigation of acrylamide polymerization photoinitiated by the three component system safranine-T/triethanolamine/diphenyliodonium chloride
Polymer
Iodonium salt improves the dentin bonding performance in an experimental dental adhesive resin
Int J Adhesion Adhesives
Effect of different post space irrigation procedures on the bond strength of a fiber post attached with a self-adhesive resin cement
J Prosthet Dent
The effect of photopolymerization on the degree of conversion, polymerization kinetic, biaxial flexure strength, and modulus of self-adhesive resin cements
J Prosthet Dent
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Supported by grants from the Brazilian government through FAPEAM (Foundation for Amazonas State Research).