Determination of resin cure using infrared analysis without an internal standard

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28 Scopus citations


Objectives. The purpose of this study was to develop a methodology whereby the monomer conversion of dental restorative resins which contain no functional group acting as an internal standard can be easily using infrared spectroscopy. Methods. Calibration solutions of MMA were made from which the quantification of weight percent methacrylate groups (CH2C(CH3CO) termed (WPMG) could be determined using infrared spectroscopy. The extent of resin cure using the WPMG method consisted of calculating the changes in WPMG pre- and post-cure. The extent of cure of a commercial unfilled bonding resin was calculated using infrared methods utilizing the internal aromatic standard, and also by means of WPMG. Results. WPMG had an identical optical constant for a wide range of monomers: MMA, TEGDMA, EGDMA, HEMA. The extent of monomer conversion using both methods of analysis indicated statistically equivalent results: 75.2 ± 1.0% using an internal standard, and 76.0 ± 1.1% using WPMG. Significance. The methods developed in this study using infrared spectroscopic methods facilitate the determination of cure of dental resins which do not have functional groups to serve as internal standards.

Original languageEnglish (US)
Pages (from-to)282-286
Number of pages5
JournalDental Materials
Issue number4
StatePublished - Jul 1994

ASJC Scopus subject areas

  • Materials Science(all)
  • Dentistry(all)
  • Mechanics of Materials


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