Degree of conversion and flexural properties of a dendrimer/methyl methacrylate copolymer: Design of experiments and statistical screening

• Objectives: The aim of this study was to investigate the effect of photosensitive initiator and activator concentrations on the degree of conversion and flexural properties of an experimental photopolymerized dental copolymer containing dendrimer. Methods: The experimental resin system consisted of a dendrimer with 12 methacrylate groups and methyl methacrylate in a mass ratio of 80:20. The initiator and activator used were camphorquinone and 2-(N,N-dimethylamino)ethyl methacrylate, whose concentrations varied individually from 1 to 4wt%. The degree of conversion was determined with FTIR spectroscopy, and flexural strength and flexural modulus with the three-point bending test. The experiments were designed and analyzed, and the results plotted with Modde 5.0 software. Results: The highest degree of conversion was obtained with 2.5wt% initiator and activator concentrations, the highest flexural strength with 2.5wt% initiator and 1.0wt% activator concentration, and the highest flexural modulus with 1.0wt% initiator and activator concentrations. Significance: The results indicated that the degree of conversion increased, and flexural strength and flexural modulus decreased, with increasing initiator and activator concentrations. The high concentrations of initiator probably inhibited the transmittance of the active wavelengths to the depths of the samples (the inner filter effect), resulting in inhomogeneous conversion and thus decreased mechanical properties. © 2004 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

Nyckelord

Biomaterials

Dendrimers

Dimethacrylates

Hyperbranched polymers

Methacrylates

Polymer materials

Polymer matrix

Statistical screening

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