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A new method for quantifying the intensity of the C=C band of dimethacrylate dental monomers in their FTIR and Raman spectra

Paper ID Volume ID Publish Year Pages File Format Full-Text
10963 711 2005 9 PDF Available
Title
A new method for quantifying the intensity of the C=C band of dimethacrylate dental monomers in their FTIR and Raman spectra
Abstract

The degree of conversion (DC) of methacrylate dental resins is typically determined by spectroscopically measuring the decrease of the vinyl (C=C) stretching band at 1640 cm−1, ratioed before and after polymerization to an internal standard (aromatic ring quadrant stretching vibration (Ph)) at around 1609 cm−1. While standard methods exist for measuring the intensity of the C=C and Ph peaks from the FTIR or Raman spectrum, these methods either fail under certain circumstances, or lack a physical basis, being purely based on spectral features. In this study, we present a rigorous method (named rotational isomerism method) for determining the intensity of the vinyl and aromatic bands from the FTIR and Raman spectra of dental monomer mixtures, and compare it to a standard baseline method (SBM) and a standard curve fitting method. Model triethyleneglycol dimethacrylate (TEGDMA)/2,2-bis(4-hydroxyphenyl)propane (Bisphenol-A) and TEGDMA/2,2-bis(4-(2-hydroxy-3-methacryloxypropoxy)phenyl)propane (Bis-GMA) mixtures with a series of known C=C/Ph molar ratios were prepared in order to simulate the effect of curing. The accuracy of the new method for measuring the DC was found to be as good as the commonly used SBM. The standard curve fitting method was shown to be inappropriate for measuring C=C/Ph ratios by FTIR spectroscopy due to its inability to realistically simulate the features of the spectra. The insight gained through the use of this new method may be useful for the characterization of other methacrylate biomaterials.

Keywords
Dental restorative material; FTIR; Bis-phenol A derivative; Crosslinking; Raman
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A new method for quantifying the intensity of the C=C band of dimethacrylate dental monomers in their FTIR and Raman spectra
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 26, Issue 33, November 2005, Pages 6440–6448
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us